阅读说明：本技术 应用分子态弱酸性HOCl水的废水处理方法 (Wastewater treatment method using molecular weakly acidic HOCl water ) 是由 周珊珊 翁祖增 陈国源 辛丰 于 2019-09-23 设计创作，主要内容包括：一种应用分子态弱酸性HOCl水的废水处理方法,所述分子态的弱酸性HOCl水的主要成分为次氯酸(HOCl),pH值约5～7,为分子态,稳定且HOCl浓度≥3,000ppm,具有强氧化性；所述分子态的弱酸性HOCl水现场生产应用,生成的同时即以混合或加药方式执行水处理。更高效能的进行氨氮处理、分解有机物、杀菌、消毒处理,用于处理高浓度、大水量废水,适应低浓度下仍然获得良好处理效果。工艺可按需求全天候运转,可精准控制残余次氯酸和余氯浓度,不会造成对后续生物处理的毒性。降低节约运输生产运行应用成本,大幅度削减药水处理成本,灭菌除臭性能突出,节能环保安全,总能耗低,便于短期折旧,不会产生污泥,避免对环境产生二次公害。(A wastewater treatment method applying molecular faintly acid HOCl water comprises the following steps that hypochlorous acid (HOCl) is used as the main component of the molecular faintly acid HOCl water, the pH value is about 5-7, the molecular state is stable, the HOCl concentration is more than or equal to 3,000ppm, and the molecular faintly acid HOCl water has strong oxidizing property; the weak acidic HOCl water in the molecular state is produced and applied on site, and water treatment is carried out in a mixing or dosing mode while the water is generated. The high-efficiency ammonia nitrogen treatment, organic matter decomposition, sterilization and disinfection treatment are carried out, and the device is used for treating high-concentration and large-water-volume wastewater and is suitable for obtaining a good treatment effect under low concentration. The process can be operated all day long as required, can accurately control the concentration of the residual hypochlorous acid and the residual chlorine, and cannot cause toxicity to the subsequent biological treatment. The method has the advantages of reducing transportation production operation application cost, greatly reducing liquid medicine treatment cost, having outstanding sterilization and deodorization performance, saving energy, protecting environment, being safe, having low total energy consumption, being convenient for short-term depreciation, not producing sludge and avoiding secondary pollution to the environment.)

1. A wastewater treatment method applying molecular weakly acidic HOCl water is characterized in that the main component of the molecular weakly acidic HOCl water is hypochlorous acid (HOCl), the pH value is 5-7, the molecular state is stable, the HOCl concentration is more than or equal to 3,000ppm, and the molecular weakly acidic HOCl water has strong oxidizing property; the weak acidic HOCl water in the molecular state is produced and applied on site, and water treatment is carried out in a mixing or dosing mode while the water is generated.

2. The method as claimed in claim 1, wherein the molecular weakly acidic HOCl water is obtained by reacting 10-30% hydrochloric acid or 10-60% sulfuric acid with 5-10% sodium hypochlorite.

3. The method as claimed in claim 1, wherein the step of obtaining the weak acidic HOCl water in molecular state is a step of generating chlorine gas generated from an anode in the electrolysis process of the acidic waste etching solution by a chlorine gas absorption system.

4. The method as claimed in claim 1, wherein the weakly acidic HOCl water in molecular state is added after initial precipitation, or before final precipitation and discharge, or before water supply disinfection, when it is used for wastewater treatment.

5. The method as claimed in claim 1, wherein the weakly acidic HOCl water in molecular state is directly added into a rapid filter, a contact tank or a clean water tank when it is used in a water purification plant.

6. The method as claimed in claim 1, wherein the weak acidic HOCl water is directly added to a second precipitation stage to remove ammonia nitrogen, oxidize organic substances, remove odor substances, and a third precipitation stage when the weak acidic HOCl water is applied to a wastewater treatment plant.

7. The method as claimed in claim 1, wherein the method comprises adding the weakly acidic HOCl water having a pH of 5-7 into the raw water of wastewater, stirring, aerating, adjusting the pH to about 8.5-10, and discharging the precipitated sludge as effluent.

8. The method as claimed in claim 1, wherein the method comprises passing the wastewater through a fine trash rack, performing initial sedimentation, sequentially performing secondary treatment, tertiary treatment, disinfection and final treatment, and adding the molecular weakly acidic HOCl water into the secondary treatment, tertiary treatment and disinfection.

9. The method as claimed in claim 2, wherein the acidic HOCl water is prepared by adding 10-60% sulfuric acid or 10-30% hydrochloric acid into an acid tank, adding 5-10% sodium hypochlorite into a sodium hypochlorite tank, adding tap water, mixing and compounding proportionally under the support of a liquid mixing pump, inputting into a storage tank, and outputting the acidic HOCl water from a liquid outlet pipe.

Technical Field

The invention belongs to the technical field of treatment of C02F water, wastewater, sewage or sludge in IPC classification or the technical field of electrolysis process for producing compounds or nonmetal by C25B, and relates to hypochlorous acid water taking molecular hypochlorous acid (HOCl) as a main component, and organic matter decomposition and ammonia nitrogen treatment of wastewater by using the hypochlorous acid water.

Background

A large amount of capital is invested in sewage treatment plants in various places to purchase ammonia nitrogen treatment equipment so as to adapt to increasingly strict emission requirements of environmental protection on ammonia nitrogen and COD, but when the concentration of ammonia nitrogen in wastewater is less than 100ppm, the technical difficulty is high and the investment cost is high when upgrading transformation is carried out, and the treatment effect is not ideal. When the COD content in the wastewater is high and the wastewater exists in the form of pollutants which are difficult to degrade, such as chemical nickel and the like, the wastewater is difficult to discharge after reaching the standard by adopting a common COD removing method.

The places such as power plant cooling water disinfection system, steel mill cooling water and water purification plant sterilization facilities generally need to purchase or customize a large amount of sterilization medicament addition products, and need to be transported to the field for daily consumption.

Disclosure of Invention

The invention aims to provide a wastewater treatment method using molecular weak-acid HOCl water, which has stable performance and can solve the technical problems, and the treatment of ammonia nitrogen treatment, organic matter decomposition, sterilization, disinfection and the like can be performed with higher efficiency by using less total amount of medicaments, so that sludge is not generated, and secondary pollution to the environment is avoided.

In the invention, the main component of the molecular weakly acidic HOCl water is hypochlorous acid (HOCl), the pH value is about 5-7, the molecular state is stable, the HOCl concentration is more than or equal to 3,000ppm, and the molecular weakly acidic HOCl water has strong oxidizing property; the weak acidic HOCl water in the molecular state is produced and applied on site, and water treatment is carried out in a mixing or dosing mode while the water is generated.

Particularly, the process for obtaining the molecular weakly acidic HOCl water is generated by reacting 5-10% hydrochloric acid or 10-60% sulfuric acid with 5-10% sodium hypochlorite. The method comprises the steps of filling 10-60% of sulfuric acid or 5-10% of hydrochloric acid into an acid barrel, filling 5-10% of sodium hypochlorite into a sodium hypochlorite barrel, adding tap water, mixing and compounding the mixture proportionally under the support of a treatment device through a liquid mixing pump, inputting the mixture into a storage barrel, and finally outputting the molecular weakly acidic HOCl water through a liquid outlet pipe.

Particularly, the process for obtaining the weak acidic HOCl water in the molecular state is that chlorine generated by an anode in the electrolysis process of the acidic etching waste liquid is generated by a chlorine absorption system.

In particular, the weak acidic HOCl water in a molecular state is suitable for wastewater treatment, and is added after primary precipitation, or is added before discharging after final precipitation, or is added before water supply disinfection.

In particular, the weak acidic HOCl water in molecular state is directly added into a rapid filter, a contact tank or a clean water tank when being applied to a water purification plant.

Particularly, when the faintly acid HOCl water in the molecular state is applied to a wastewater plant, the faintly acid HOCl water is directly added in a secondary precipitation link to remove ammonia nitrogen, oxidize organic matters and remove odor substances, and is added in a tertiary precipitation link.

Particularly, when the method is applied to treatment of organic matters in wastewater, a specific treatment process is shown in figure 1, weak acid HOCl water with the pH value of about 5-7 is added into raw wastewater, the mixture is stirred, then aeration is carried out, the pH value is adjusted to about 8.5-10, and then sludge precipitation and effluent discharge are carried out.

Particularly, when the method is applied to the treatment of organic matters in wastewater, the wastewater from a pumping station passes through a fine trash rack, is subjected to primary sedimentation, is sequentially subjected to secondary treatment, tertiary treatment, disinfection and final treatment, and molecular weakly acidic HOCl water is respectively added into the secondary treatment, the tertiary treatment and the disinfection.

The invention has the advantages and effects that: the weak acid HOCl water in molecular state is produced and applied on site, is used for treating high-concentration and large-water-volume wastewater, has a certain removal effect on organic matters, microorganisms, peculiar smell molecules and partial metal ions in the environment, can be operated all day by day according to the requirement, can accurately control the concentration of residual hypochlorous acid and residual chlorine, and cannot cause toxicity to subsequent biological treatment. The method has the advantages of reducing transportation production operation application cost saving, greatly reducing liquid medicine treatment cost, performing ammonia nitrogen treatment with high efficiency, decomposing organic matters, having outstanding sterilization and deodorization performance, saving energy, protecting environment, being safe, having low total energy consumption, being convenient for short-term depreciation, not generating sludge and avoiding secondary pollution to the environment.

Drawings

FIG. 1 is a flow chart of a simple aeration process for treating organic matters in wastewater by using molecular weakly acidic HOCl water.

FIG. 2 is a flow chart of a three-stage composite treatment process of molecular weakly acidic HOCl water for wastewater.

Detailed Description

The principle of the invention is that the developed medicament mixing technology generates the weak acidic HOCl water in a molecular state, the water is in the molecular state, the pH value is designed and adjusted to be weak acid, particularly the pH value is selected to be about 5-7, the water has strong oxidation performance, and the deodorization capability is greatly improved, so that the water can still obtain good treatment effect under low concentration. In addition, the faintly acid HOCl water in a molecular state is faintly acid as the skin of a human body, so that the safety is greatly improved. The hypochlorous acid water liquid has strong oxidation effect, contains high-concentration hypochlorous acid and chlorate ions, has certain removal effect on organic matters, microorganisms, peculiar smell molecules, partial metal ions and ammonia nitrogen in the environment, can reduce the infection risk and is environment-friendly. The molecular weakly acidic HOCl water is not disclosed in the aspect of deep oxidation treatment of wastewater.

The invention is further illustrated by the following figures and examples.