阅读说明：本技术 一种污泥脱水干化处理工艺 (Sludge dewatering and drying treatment process ) 是由 沈小波 张强 于 2021-09-16 设计创作，主要内容包括：本发明属于废水污泥处理技术领域,具体涉及一种污泥脱水干化处理工艺,该工艺包括如下步骤：污泥预处理：对污泥进行臭味收集处理,计算污泥的干重,按照质量比例量取污泥调理剂,污泥调理剂的用量为污泥干重的13.2％-23.4％；采用污泥调理剂对污泥进行脱水调理,再加入杀菌消毒剂对污泥进行消毒灭菌；通过改性后聚合氯化铁表面积增大,使得聚合氯化铁对微絮体的吸附能力增强,微絮体相互粘结,更易聚集结合,起到了吸附架桥作用,促使微絮粒形成更大的絮体,加大沉淀速率,提高污染物去除效率,进而提高了污泥脱水干化的效果；通过加入高岭土,起到了吸附架桥作用,促使微絮粒形成更大的絮体,加大沉淀速率,提高污染物去除效率。(The invention belongs to the technical field of wastewater and sludge treatment, and particularly relates to a sludge dewatering and drying treatment process, which comprises the following steps: sludge pretreatment: performing odor collection treatment on sludge, calculating the dry weight of the sludge, and weighing a sludge conditioner according to the mass proportion, wherein the using amount of the sludge conditioner is 13.2-23.4% of the dry weight of the sludge; dewatering and conditioning the sludge by adopting a sludge conditioner, and then adding a sterilizing disinfectant to sterilize and disinfect the sludge; the surface area of the modified polyferric chloride is increased, so that the adsorption capacity of the polyferric chloride on the micro flocs is enhanced, the micro flocs are mutually bonded and are easy to aggregate and combine, an adsorption bridging effect is achieved, the micro flocs are promoted to form larger flocs, the precipitation rate is increased, the pollutant removal efficiency is improved, and the sludge dewatering and drying effects are further improved; through adding kaolin, the adsorption and bridging effects are achieved, micro flocs are promoted to form larger flocs, the precipitation rate is increased, and the pollutant removal efficiency is improved.)

1. A sludge dewatering and drying treatment process is characterized in that: the method comprises the following steps:

the method comprises the following steps: sludge pretreatment: performing odor collection treatment on sludge, calculating the dry weight of the sludge, and weighing a sludge conditioner according to the mass proportion, wherein the using amount of the sludge conditioner is 13.2-23.4% of the dry weight of the sludge; dewatering and conditioning the sludge by adopting a sludge conditioner, and then adding a sterilizing disinfectant to sterilize and disinfect the sludge;

step two: sludge dewatering: dewatering the sludge in the step one in a filter press, wherein the water content of the dewatered sludge is 70-75%, flowing the sewage after filter pressing sedimentation into a waste liquid collecting tank, adding a coagulant, and settling for 7-10 h;

step three: sludge drying: putting the sludge in the step two into a sludge drier, introducing steam with the temperature of 100-150 ℃ in a steam boiler into the sludge drier, and heating the sludge; condensing the water vapor generated by heating and then discharging the water vapor; the waste gas generated by evaporation in the dryer is conveyed to a waste gas treatment tower through a pipeline for waste gas treatment.

2. The sludge dewatering and drying treatment process according to claim 1, characterized in that: the sludge conditioner comprises the following raw materials in parts by weight: 35.57-56.36 parts of modified polyferric chloride, 15.25-20.95 parts of kaolin, 3.36-4.23 parts of silane coupling agent, 4.23-6.95 parts of modifier and 3.74-4.15 parts of oxidant;

the modified polyferric chloride is prepared by the following steps:

step SS1, dispersing the polyferric chloride in an ethanol water solution, adding a silane coupling agent under the protection of nitrogen, heating to 45-55 ℃, and then carrying out heat preservation and reflux to obtain an intermediate B;

step SS 2: adding the intermediate B into a 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride solution, stirring, fully reacting, filtering and washing to obtain an intermediate C;

and SS3, adding the intermediate C, a modifier and an oxidant into a supercritical CO2 reaction kettle, reacting for 2-3h at the temperature of 50-95 ℃ and under the pressure of 35MPa, taking out, standing and precipitating, removing supernatant, performing water washing treatment, performing overflow water washing for 5-10min, adding 0.5-1g/L acetic acid for neutralization, performing overflow water washing for 5-10min, and performing water washing until the pH value is 6.5-8 to obtain the modified polyferric chloride.

3. The sludge dewatering and drying treatment process according to claim 2, characterized in that: in the step SS1, the dosage ratio of the polyferric chloride to the ethanol aqueous solution is 3.85 g:35mL of the S2 solution of the intermediate B and the 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride in a ratio of 20.25 g: 45 mL.

4. The sludge dewatering and drying treatment process according to claim 2, characterized in that: the dosage ratio of the intermediate C, the modifier, the oxidant and the acetic acid in the step SS3 is 5.6 g: 0.85: 1.32 g: 15 mL.

5. The sludge dewatering and drying treatment process according to claim 2, characterized in that: the sludge conditioner is prepared by the following steps:

step S1, adding kaolin and modified polyferric chloride into water at 40-60 ℃, mixing and stirring for 1-3h, adding an ethylene diamine tetraacetic acid solution for reaction, performing ultrasonic dispersion for 15-30min, removing supernatant after separation, adding water, performing ultrasonic sealing storage to obtain a suspension, adding mixed acid of hydrochloric acid and sulfuric acid, and adjusting the pH value of the suspension to 3.25-4.25 to obtain an intermediate A;

step S2, adding a catalyst into the intermediate A, stirring until the catalyst is dissolved, adding a filter aid, heating to 110-130 ℃, and reacting for 2-3h under the condition of continuous heat preservation; and adding the mixture into aqueous solution of hydrogen peroxide, stirring for 4-8h, centrifugally separating and washing the reactant, repeating the process for 3-5 times, and drying the obtained product at 80-90 ℃ in vacuum to constant weight to obtain the sludge conditioner.

6. The sludge dewatering and drying treatment process according to claim 5, characterized in that: the mixed acid of hydrochloric acid and sulfuric acid in S4 is hydrochloric acid and sulfuric acid according to the ratio of 3 mL: 5mL, 5mL of mixed acid of hydrochloric acid and sulfuric acid, and 5mL of ethylene diamine tetraacetic acid solution: 8 mL.

7. The sludge dewatering and drying treatment process according to claim 5, characterized in that: in step S2, the amount ratio of the intermediate a, the catalyst, the filter aid, and the aqueous hydrogen peroxide solution was 7 g: 0.35 g:35mL of 1.2 g.

Technical Field

The invention belongs to the technical field of wastewater and sludge treatment, and relates to a sludge dewatering and drying treatment process.

Background

With the rapid development of economic society and the increase of water treatment coverage, municipal sewage treatment plants generate a large amount of excess sludge every day. The sludge mainly comprises microbial cell groups and decomposed products thereof, contains a large amount of organic matters, also contains a large amount of harmful substances such as heavy metal ions, pathogens and the like, and has the characteristics of high water content, large volume, complex shape, difficult transportation and the like.

Sludge drying refers to a process of directly or indirectly heating sludge by using a heat medium through a special process and equipment to evaporate all or part of water in the sludge. The sludge heat drying treatment can further enhance the reduction of the water content of the sludge after mechanical dehydration, can be adjusted according to the treatment mode of the sludge after dehydration, and even can achieve full drying. The dried sludge can be directly buried and burned, can be further processed to be used as a soil conditioner, a fertilizer or a building material and the like, and can also be used as an alternative energy source by utilizing the heat value of the sludge.

The sludge conditioner is required to be added during sludge drying, the traditional sludge conditioner (such as polyacrylamide) is used as a sludge treatment conditioner, the water content of the dewatered and dried sludge is not low, and although some sludge conditioners have no toxicity, monomers which do not participate in reaction in the sludge conditioners, such as acrylamide and the like, have great toxicity, so that the development of the sludge conditioner with high flocculation activity and no toxicity is urgent and has practical significance.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a sludge dewatering and drying treatment process which is used for solving the technical problems.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

a sludge dewatering and drying treatment process comprises the following steps:

the method comprises the following steps: sludge pretreatment: performing odor collection treatment on sludge, calculating the dry weight of the sludge, and weighing a sludge conditioner according to the mass proportion, wherein the using amount of the sludge conditioner is 13.2-23.4% of the dry weight of the sludge; dewatering and conditioning the sludge by adopting a sludge conditioner, and then adding a sterilizing disinfectant to sterilize and disinfect the sludge; the sludge conditioner can ensure that sludge particles are flocculated and polymerized again, the volume of the sludge particles is increased, so that the dehydration effect of the sludge is improved, the water content of the sludge after filter pressing can be reduced from more than 98% to less than 60%, and the drying cost is greatly reduced;

step two: sludge dewatering: dewatering the sludge in the step one in a filter press, wherein the water content of the dewatered sludge is 70-75%, flowing the sewage after filter pressing sedimentation into a waste liquid collecting tank, adding a coagulant, and settling for 7-10 h;

step three: sludge drying: putting the sludge in the step two into a sludge drier, introducing steam with the temperature of 100-150 ℃ in a steam boiler into the sludge drier, and heating the sludge; condensing the water vapor generated by heating and then discharging the water vapor; the waste gas generated by evaporation in the dryer is conveyed to a waste gas treatment tower through a pipeline for waste gas treatment.

Further, the sludge conditioner comprises the following raw materials in parts by weight: 35.57-56.36 parts of modified polyferric chloride, 15.25-20.95 parts of kaolin, 3.36-4.23 parts of silane coupling agent, 4.23-6.95 parts of modifier and 3.74-4.15 parts of oxidant;

the modified polyferric chloride is prepared by the following steps:

step SS1, dispersing the polyferric chloride in an ethanol water solution, adding a silane coupling agent under the protection of nitrogen, heating to 45-55 ℃, and then carrying out heat preservation and reflux to obtain an intermediate B;

step SS 2: adding the intermediate B into a 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride solution, stirring, fully reacting, filtering and washing to obtain an intermediate C;

and SS3, adding the intermediate C, a modifier and an oxidant into a supercritical CO2 reaction kettle, reacting for 2-3h at the temperature of 50-95 ℃ and under the pressure of 35MPa, taking out, standing and precipitating, removing supernatant, performing water washing treatment, performing overflow water washing for 5-10min, adding 0.5-1g/L acetic acid for neutralization, performing overflow water washing for 5-10min, and performing water washing until the pH value is 6.5-8 to obtain the modified polyferric chloride.

Further, the amount ratio of the polymeric ferric chloride to the ethanol aqueous solution in the step SS1 was 3.85 g:35mL of the S2 solution of the intermediate B and the 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride in a ratio of 20.25 g: 45 mL.

Further, the dosage ratio of the intermediate C, the modifier, the oxidant and the acetic acid in the step SS3 is 5.6 g: 0.85 g: 1.32 g: 15 mL.

Furthermore, in the step SS3, the oxidant is obtained by mixing hydrogen peroxide and sodium chlorate according to the mass ratio.

Further, the sludge conditioner is prepared by the following steps:

step S1, adding kaolin and modified polyferric chloride into water at 40-60 ℃, mixing and stirring for 1-3h, adding an ethylene diamine tetraacetic acid solution for reaction, performing ultrasonic dispersion for 15-30min, removing supernatant after separation, adding water, performing ultrasonic sealing storage to obtain a suspension, adding mixed acid of hydrochloric acid and sulfuric acid, and adjusting the pH value of the suspension to 3.25-4.25 to obtain an intermediate A;

step S2, adding a catalyst into the intermediate A, stirring until the catalyst is dissolved, adding a filter aid, heating to 110-130 ℃, and reacting for 2-3h under the condition of continuous heat preservation; and adding the mixture into aqueous solution of hydrogen peroxide, stirring for 4-8h, centrifugally separating and washing the reactant, repeating the process for 3-5 times, and drying the obtained product at 80-90 ℃ in vacuum to constant weight to obtain the sludge conditioner.

Further, the stirring temperature in step S2 was 25 ℃, the stirring time was 30min, and the stirring speed was 100 rpm.

Further, the mixed acid of hydrochloric acid and sulfuric acid in step S1 is hydrochloric acid and sulfuric acid in a ratio of 3 mL: 5mL, 5mL of mixed acid of hydrochloric acid and sulfuric acid, and 5mL of ethylene diamine tetraacetic acid solution: 8 mL.

Further, in step S2, the amount ratio of the intermediate a, the catalyst, the filter aid, and the aqueous hydrogen peroxide solution was 7 g: 0.35 g:35mL of 1.2 g.

Further, the catalyst in step S2 is nitrate or nitrite.

Further, in step S2, the filter aid is prepared by mixing cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride, and dodecyl trimethyl ammonium chloride in a mass ratio.

Further, the molar concentration of the 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride solution was 50 mmol/L.

The invention has the beneficial effects that:

(1) firstly, adding a silane coupling agent with amino under the protection of nitrogen to modify the surface of the polyferric chloride, and connecting the polyferric chloride to the surface of the polyferric chloride by a 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride solution through chemical bonds, so that the agglomeration among the polyferric chloride can be effectively reduced, the dispersibility of the polyferric chloride is enhanced, the polyferric chloride plays a role in adsorbing micro-flocs in sludge, the cavitation effect on the surface can be promoted among the polyferric chloride, and the breaking effect on the micro-flocs is enhanced; the added kaolin can be dispersed in the solid particles of the sludge, so that the toughness among the polyferric chloride can be remarkably improved to form a reinforced skeleton and maintain the permeability of sludge dehydration.

(2) The surface area of the modified polyferric chloride is increased, so that the adsorption capacity of the polyferric chloride on the micro flocs is enhanced, the micro flocs are mutually bonded and are easy to aggregate and combine, an adsorption bridging effect is achieved, the micro flocs are promoted to form larger flocs, the precipitation rate is increased, the pollutant removal efficiency is improved, and the sludge dewatering and drying effects are further improved; through adding kaolin, the adsorption and bridging effects are achieved, micro flocs are promoted to form larger flocs, the precipitation rate is increased, and the pollutant removal efficiency is improved.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Preparing modified polyferric chloride:

and SS1, dispersing the polyferric chloride in an ethanol water solution, and controlling the dosage ratio of the polyferric chloride to the ethanol water solution to be 3.85 g:35mL, adding a silane coupling agent under the protection of nitrogen, heating to 45 ℃, and then carrying out heat preservation and reflux to obtain an intermediate B;

step SS 2: adding the intermediate B into a 50mmol/L solution of 2,2 '-methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride, and controlling the dosage ratio of the intermediate B to the solution of 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride to be 20.25 g: 45mL, stirring, fully reacting, filtering and washing to obtain an intermediate C;

and SS3, adding the intermediate C, a modifier and an oxidant into a supercritical CO2 reaction kettle, and controlling the dosage ratio of the intermediate C, the modifier, the oxidant and acetic acid to be 5.6 g: 0.85 g: 1.32 g: 15mL, mixing an oxidant which is hydrogen peroxide and sodium chlorate in a mass ratio, reacting for 2h at the temperature of 50 ℃ and the pressure of 35MPa, taking out, standing and precipitating, removing supernate, performing water washing treatment, performing overflow water washing for 5min, adding 0.5g/L acetic acid for neutralization, performing overflow water washing for 5min, and performing water washing until the pH value is 6.5 to obtain the modified polyferric chloride.

Example 2

Preparing modified polyferric chloride:

and SS1, dispersing the polyferric chloride in an ethanol water solution, and controlling the dosage ratio of the polyferric chloride to the ethanol water solution to be 3.85 g:35mL, adding a silane coupling agent under the protection of nitrogen, heating to 50 ℃, and then carrying out heat preservation and reflux to obtain an intermediate B;

step SS 2: adding the intermediate B into a 50mmol/L solution of 2,2 '-methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride, and controlling the dosage ratio of the intermediate B to the solution of 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride to be 20.25 g: 45mL, stirring, fully reacting, filtering and washing to obtain an intermediate C;

and SS3, adding the intermediate C, a modifier and an oxidant into a supercritical CO2 reaction kettle, and controlling the dosage ratio of the intermediate C, the modifier, the oxidant and acetic acid to be 5.6 g: 0.85 g: 1.32 g: 15mL, mixing an oxidant which is hydrogen peroxide and sodium chlorate in a mass ratio, reacting for 2.5h at the temperature of 75 ℃ and the pressure of 35MPa, taking out, standing and precipitating, removing supernatant, performing water washing treatment, performing overflow water washing for 7min, adding 0.8g/L acetic acid for neutralization, performing overflow water washing for 8min, and performing water washing until the pH value is 7.5 to obtain the modified polyferric chloride.

Example 3

Preparing a sludge conditioner:

and SS1, dispersing the polyferric chloride in an ethanol water solution, and controlling the dosage ratio of the polyferric chloride to the ethanol water solution to be 3.85 g:35mL, adding a silane coupling agent under the protection of nitrogen, heating to 55 ℃, and then carrying out heat preservation and reflux to obtain an intermediate B;

step SS 2: adding the intermediate B into a 50mmol/L solution of 2,2 '-methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride, and controlling the dosage ratio of the intermediate B to the solution of 2, 2' -methylene-bis (4, 6-di-tert-butylphenol) phosphoryl chloride to be 20.25 g: 45mL, stirring, fully reacting, filtering and washing to obtain an intermediate C;

and SS3, adding the intermediate C, a modifier and an oxidant into a supercritical CO2 reaction kettle, and controlling the dosage ratio of the intermediate C, the modifier, the oxidant and acetic acid to be 5.6 g: 0.85 g: 1.32 g: 15mL, mixing an oxidant which is hydrogen peroxide and sodium chlorate in a mass ratio, reacting for 3h at the temperature of 95 ℃ and the pressure of 35MPa, taking out, standing and precipitating, removing supernate, performing water washing treatment, performing overflow water washing for 10min, adding 1g/L acetic acid for neutralization, performing overflow water washing for 10min, and washing until the pH value is 8 to obtain the modified polyferric chloride.

Example 4

Preparing a sludge conditioner:

step S1: adding kaolin and modified polyferric chloride into water at 40 ℃, mixing and stirring for 1h, adding an ethylene diamine tetraacetic acid disodium solution for reaction, performing ultrasonic dispersion for 15min, separating, removing a supernatant, adding water, performing ultrasonic sealing and storage to obtain a suspension, and adding a mixed acid of hydrochloric acid and sulfuric acid, wherein the mixed acid of hydrochloric acid and sulfuric acid is hydrochloric acid and sulfuric acid in a volume of 3 mL: 5mL, controlling the dosage ratio of the mixed acid of hydrochloric acid and sulfuric acid to the disodium ethylene diamine tetraacetate solution to be 5 mL: 8mL, and adjusting the pH value of the suspension to 3.25 to obtain an intermediate A;

step S2, adding a catalyst into the intermediate A, stirring until the nitrate or nitrite catalyst is dissolved, adding a filter aid, wherein the filter aid is prepared by mixing cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride and dodecyl trimethyl ammonium chloride in a mass ratio, heating to 110 ℃, and reacting for 2 hours under the condition of continuous heat preservation; and then adding the intermediate A, the catalyst, the filter aid and the aqueous hydrogen peroxide solution into the aqueous hydrogen peroxide solution, wherein the using ratio of the intermediate A, the catalyst, the filter aid and the aqueous hydrogen peroxide solution is controlled to be 7 g: 0.35 g: and (3) stirring the mixture for 4 hours at the stirring temperature of 25 ℃ for 30min at the stirring speed of 100rpm, centrifugally separating and washing the reactant, repeating the step for 3 times, and drying the obtained product at 80 ℃ in vacuum to constant weight to obtain the sludge conditioner.

Example 5

Preparing a sludge conditioner:

step S1: adding kaolin and modified polyferric chloride into water at 50 ℃, mixing and stirring for 2h, adding an ethylene diamine tetraacetic acid disodium solution for reaction, performing ultrasonic dispersion for 23min, separating, removing a supernatant, adding water, performing ultrasonic sealing and storage to obtain a suspension, and adding a mixed acid of hydrochloric acid and sulfuric acid, wherein the mixed acid of hydrochloric acid and sulfuric acid is hydrochloric acid and sulfuric acid in a volume of 3 mL: 5mL, controlling the dosage ratio of the mixed acid of hydrochloric acid and sulfuric acid to the disodium ethylene diamine tetraacetate solution to be 5 mL: 8mL, and adjusting the pH value of the suspension to 3.75 to obtain an intermediate A;

step S2, adding a catalyst into the intermediate A, stirring until the nitrate or nitrite catalyst is dissolved, adding a filter aid, mixing the filter aid with cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride and dodecyl trimethyl ammonium chloride in a mass ratio, heating to 120 ℃, and reacting for 2.5 hours under the condition of continuous heat preservation; and then adding the intermediate A, the catalyst, the filter aid and the aqueous hydrogen peroxide solution into the aqueous hydrogen peroxide solution, wherein the using ratio of the intermediate A, the catalyst, the filter aid and the aqueous hydrogen peroxide solution is controlled to be 7 g: 0.35 g: and (3) stirring the mixture for 6 hours at the stirring temperature of 25 ℃ for 30min at the stirring speed of 100rpm after stirring the mixture for 1.2g of 35mL, centrifugally separating and washing the reactant, repeating the step for 4 times, and drying the obtained product at 85 ℃ in vacuum to constant weight to obtain the sludge conditioner.

Example 6

Preparing a sludge conditioner:

step S1: adding kaolin and modified polyferric chloride into water at 60 ℃, mixing and stirring for 3h, adding an ethylene diamine tetraacetic acid disodium solution for reaction, performing ultrasonic dispersion for 30min, separating, removing a supernatant, adding water, performing ultrasonic sealing and storage to obtain a suspension, and adding a mixed acid of hydrochloric acid and sulfuric acid, wherein the mixed acid of hydrochloric acid and sulfuric acid is hydrochloric acid and sulfuric acid in a volume of 3 mL: 5mL, controlling the dosage ratio of the mixed acid of hydrochloric acid and sulfuric acid to the disodium ethylene diamine tetraacetate solution to be 5 mL: 8mL, and adjusting the pH value of the suspension to 4.25 to obtain an intermediate A;

step S2, adding a catalyst into the intermediate A, stirring until the nitrate or nitrite catalyst is dissolved, adding a filter aid, mixing the filter aid with cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride and dodecyl trimethyl ammonium chloride in a mass ratio, heating to 130 ℃, and reacting for 3 hours under the condition of continuous heat preservation; and then adding the intermediate A, the catalyst, the filter aid and the aqueous hydrogen peroxide solution into the aqueous hydrogen peroxide solution, wherein the using ratio of the intermediate A, the catalyst, the filter aid and the aqueous hydrogen peroxide solution is controlled to be 7 g: 0.35 g: and (3) stirring the mixture for 8 hours at the stirring temperature of 25 ℃ for 30min at the stirring speed of 100rpm after stirring the mixture for 1.2g of 35mL, centrifugally separating and washing the reactant, repeating the step for 5 times, and drying the obtained product at the temperature of 90 ℃ in vacuum to constant weight to obtain the sludge conditioner.

Example 7

A sludge dewatering and drying treatment process comprises the following steps:

the method comprises the following steps: sludge pretreatment: performing odor collection treatment on sludge, calculating the dry weight of the sludge, and weighing a sludge conditioner according to the mass proportion, wherein the using amount of the sludge conditioner is 13.2% of the dry weight of the sludge; dewatering and conditioning the sludge by using the sludge conditioner prepared in the embodiment 2, and then adding a sterilizing disinfectant to sterilize and disinfect the sludge;

step two: sludge dewatering: putting the sludge in the step one into a filter press for dehydration, wherein the water content of the dehydrated sludge is 70 percent, flowing the sewage after filter pressing sedimentation into a waste liquid collecting tank, adding a coagulant, and settling for 7 hours; the sludge after filter pressing often contains more moisture, so that the sludge is dried more thoroughly in order to reduce the moisture of the sludge and reduce the volume of the sludge;

step three: sludge drying: putting the sludge in the step two into a sludge drier, introducing steam with the temperature of 100 ℃ in a steam boiler into the sludge drier, and heating the sludge; condensing the water vapor generated by heating and then discharging the water vapor; the waste gas generated by evaporation in the dryer is conveyed to a waste gas treatment tower through a pipeline for waste gas treatment.

Example 8

A sludge dewatering and drying treatment process comprises the following steps:

the method comprises the following steps: performing sludge pretreatment to collect odor of sludge, calculating the dry weight of the sludge, and weighing a sludge conditioner according to a mass ratio, wherein the using amount of the sludge conditioner is 17.4% of the dry weight of the sludge; dewatering and conditioning the sludge by using the sludge conditioner prepared in the embodiment 2, and then adding a sterilizing disinfectant to sterilize and disinfect the sludge;

step two: sludge dewatering: putting the sludge in the step one into a filter press for dehydration, wherein the water content of the dehydrated sludge is 73%, flowing the filter-pressed and settled sewage into a waste liquid collecting tank, adding a coagulant, and settling for 8.5 hours; the sludge after filter pressing often contains more moisture, so that the sludge is dried more thoroughly in order to reduce the moisture of the sludge and reduce the volume of the sludge;

step three: sludge drying: putting the sludge in the step two into a sludge drier, introducing steam with the temperature of 130 ℃ in a steam boiler into the sludge drier, and heating the sludge; condensing the water vapor generated by heating and then discharging the water vapor; the waste gas generated by evaporation in the dryer is conveyed to a waste gas treatment tower through a pipeline for waste gas treatment.

Example 9

A sludge dewatering and drying treatment process comprises the following steps:

the method comprises the following steps: sludge pretreatment: performing odor collection treatment on sludge, calculating the dry weight of the sludge, and weighing a sludge conditioner according to the mass proportion, wherein the using amount of the sludge conditioner is 23.4% of the dry weight of the sludge; dewatering and conditioning the sludge by using the sludge conditioner prepared in the embodiment 2, and then adding a sterilizing disinfectant to sterilize and disinfect the sludge;

step two: sludge dewatering: putting the sludge in the step one into a filter press for dehydration, wherein the water content of the dehydrated sludge is 75%, allowing the filter-pressed settled sewage to flow into a waste liquid collecting tank, adding a coagulant, and settling for 10 hours; the sludge after filter pressing often contains more moisture, so that the sludge is dried more thoroughly in order to reduce the moisture of the sludge and reduce the volume of the sludge;

step three: sludge drying: putting the sludge in the step two into a sludge drier, introducing steam with the temperature of 150 ℃ in a steam boiler into the sludge drier, and heating the sludge; condensing the water vapor generated by heating and then discharging the water vapor; the waste gas generated by evaporation in the dryer is conveyed to a waste gas treatment tower through a pipeline for waste gas treatment.

Comparative example 1: the polymeric ferric chloride was not modified compared to example 8.

The sludge conditioners prepared in the examples 7 to 9 and the comparative example 1 are applied to the sludge dewatering and drying treatment, meanwhile, the comparative example 2 without the sludge conditioner is added, and the water content of the sludge cake after the sludge dewatering and drying treatment is tested and detected, and the obtained results are shown in the following table:

TABLE 1

As can be seen from Table 1, in the case of comparative example 1, the sludge using the sludge conditioner without modified poly-ferric chloride affected the dehydration and drying of the sludge,

compared with the comparative example 2, when the sludge conditioner is not used, the dehydration and drying of the sludge are more strongly influenced; the polymeric ferric chloride is modified, so that the adsorption performance of the polymeric ferric chloride can be improved more remarkably; the surface area of the modified polyferric chloride is increased, so that the adsorption capacity of the polyferric chloride on the micro flocs is enhanced, the micro flocs are mutually bonded and are easy to aggregate and combine, an adsorption bridging effect is achieved, the micro flocs are promoted to form larger flocs, the precipitation rate is increased, the pollutant removal efficiency is improved, and the sludge dewatering and drying effects are further improved; through adding kaolin, the adsorption and bridging effects are achieved, micro flocs are promoted to form larger flocs, the precipitation rate is increased, and the pollutant removal efficiency is improved.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.