阅读说明：本技术 一种腐植酸废水中碳资源回收的方法 (Method for recycling carbon resources in humic acid wastewater ) 是由 周涛 赵由才 武舒娅 李天� 伍娜 于 2019-06-28 设计创作，主要内容包括：本发明涉及一种腐植酸废水中碳资源回收的方法,直接在腐植酸废水中投入(3-氨基丙基)三乙氧基硅烷,经过絮凝沉淀,过滤沉淀物,得到腐植酸分离产品,实现腐植酸废水中碳资源回收。与现有技术相比,本发明采用腐植酸分离沉淀工艺简单、成本低廉,能高效回收废水中碳资源,具有较高的经济与社会环境效益。(The invention relates to a method for recycling carbon resources in humic acid wastewater, which comprises the steps of directly adding (3-aminopropyl) triethoxysilane into the humic acid wastewater, performing flocculation precipitation, filtering precipitates to obtain a humic acid separation product, and recycling the carbon resources in the humic acid wastewater. Compared with the prior art, the method has the advantages of simple humic acid separation and precipitation process, low cost, capability of efficiently recovering carbon resources in the wastewater and higher economic and social environmental benefits.)

1. A method for recycling carbon resources in humic acid wastewater is characterized in that (3-aminopropyl) triethoxysilane is directly added into the humic acid wastewater, and a humic acid separation product is obtained by flocculating precipitation and filtering precipitates, so that the carbon resources in the humic acid wastewater are recycled.

2. The method for recovering the carbon resource in the humic acid wastewater as claimed in claim 1, which is characterized by comprising the following steps:

(1) Placing the humic acid wastewater in a constant-temperature water bath, and stirring:

(2) Adjusting the pH value to 3-7, and then adding (3-aminopropyl) triethoxysilane;

(3) firstly stirring at a high speed, then stirring at a low speed, standing, and performing flocculation precipitation;

(4) and filtering the precipitate to obtain a humic acid separation product, thereby realizing the recovery of carbon resources in the humic acid wastewater.

3. The method for recycling the carbon resource in the humic acid wastewater according to claim 2, wherein the concentration of the humic acid in the humic acid wastewater is 50-1000 mg/L.

4. The method for recycling the carbon resource in the humic acid wastewater according to claim 2, wherein the temperature of the thermostatic water bath in the step (1) is 10-60 ℃.

5. The method for recycling the carbon resource in the humic acid wastewater according to claim 2, wherein in the step (2), the pH is adjusted to 3-5.

6. The method for recovering the carbon resource in the humic acid wastewater as claimed in claim 2, wherein the pH value is adjusted in step (2) by using HCl or NaOH with a concentration of 0.1M.

7. The method for recycling the carbon resource in the humic acid wastewater as claimed in claim 2, wherein in the step (2), the addition amount of the (3-aminopropyl) triethoxysilane is 1.0-10.0 mL/L.

8. The method for recycling the carbon resource in the humic acid wastewater as claimed in claim 2, wherein in the step (3), the high-speed stirring speed is 200rpm, and the stirring time is 10 min; the low-speed stirring speed is 50rpm, and the stirring time is 20 min; standing for 30 min.

9. the method for recovering the carbon resource in the humic acid wastewater as claimed in claim 2, wherein in the step (4), the precipitate is filtered by using medium-speed qualitative filter paper.

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a method for recycling carbon resources in humic acid wastewater.

Background

Humic Acid (HA) is derived from the microbial degradation of biomolecules and is the main component of humus. The high affinity of humus makes it easy to complex with heavy metal, pesticide and other pollutant to pollute surface water and underground water. Humus mainly comprises humic acid, fulvic acid and humins which are typical naturally formed compounds, account for 30% -80% of dissolved organic substances in natural water, not only affect water quality, but also are not beneficial to water treatment.

Humic acid in the wastewater is an abundant carbon resource, and separation and extraction of the humic acid also provide important support for recycling of the carbon resource. (3-aminopropyl) triethoxysilane (APTES) has been widely used to modify inorganic materials to improve their solubility, dispersibility, and contaminant adsorption capabilities. To date, most of the research to date has focused on indirect assessment of flocculation performance, however, the removal of organic material using APTES directly remains to be investigated.

Disclosure of Invention

the invention aims to overcome the defects in the prior art and provide a method for recycling carbon resources in humic acid wastewater.

The purpose of the invention can be realized by the following technical scheme:

A method for recycling carbon resources in humic acid wastewater comprises the steps of directly adding (3-aminopropyl) triethoxysilane (APTES) into Humic Acid (HA) wastewater, performing flocculation precipitation, filtering precipitates to obtain a humic acid separation product, and recycling the carbon resources in the humic acid wastewater.

preferably, the method comprises the following steps:

(1) Placing the humic acid wastewater in a constant-temperature water bath, and stirring:

(2) Adjusting the pH value to 3-7, and then adding (3-aminopropyl) triethoxysilane;

(3) firstly stirring at a high speed, then stirring at a low speed, standing, and performing flocculation precipitation;

(4) and filtering the precipitate to obtain a humic acid separation product, thereby realizing the recovery of carbon resources in the humic acid wastewater.

Preferably, the concentration of humic acid in the humic acid wastewater is 50-1000 mg/L.

preferably, the temperature of the constant-temperature water bath in the step (1) is 10-60 ℃.

Preferably, in the step (2), the pH is adjusted to 3-5.

Preferably, the pH is adjusted in step (2) using HCl or NaOH at a concentration of 0.1M.

Preferably, in step (2), the amount of (3-aminopropyl) triethoxysilane added is 1.0-10.0 mL/L.

Preferably, in the step (3), the high-speed stirring speed is 200rpm, and the stirring time is 10 min; the low-speed stirring speed is 50rpm, and the stirring time is 20 min; standing for 30 min.

Preferably, in step (4), the precipitate is filtered using medium speed qualitative filter paper.

due to the functional group capable of hydrolysis, condensation and self-assembly, the APTES can be used as an effective flocculant for removing pollutants, so that the separation and recycling of organic carbon are realized. Based on the above, the invention provides a method for separating carbon resources in humic acid wastewater by using APTES, which realizes rapid and efficient precipitation separation of humic acid.

Compared with the prior art, the method has the advantages of simple process, low cost, high efficiency in separating and recovering humic acid carbon resources in the wastewater, and higher economic and social environmental benefits.

Drawings

FIG. 1 shows the separation effect of HA from wastewater under different reaction conditions shown in examples. Wherein, figure 1(a) represents the effect of APTES dose on HA separation efficiency; FIG. 1(b) represents the effect of system reaction temperature on HA separation efficiency; FIG. 1(c) is the effect of initial HA concentration on HA separation efficiency; FIG. 1(d) represents the effect of system pH on HA separation.

Detailed Description

the invention is described in detail below with reference to the figures and specific embodiments.

A method for recycling carbon resources in humic acid wastewater comprises the steps of directly adding (3-aminopropyl) triethoxysilane (APTES) into Humic Acid (HA) wastewater, performing flocculation precipitation, filtering precipitates to obtain a humic acid separation product, and recycling the carbon resources in the humic acid wastewater.

The method specifically comprises the following steps:

(1) Placing the humic acid wastewater in a constant-temperature water bath, and stirring:

(2) Adjusting the pH value to 3-7, and then adding (3-aminopropyl) triethoxysilane;

(3) Firstly stirring at a high speed, then stirring at a low speed, standing, and performing flocculation precipitation;

(4) And filtering the precipitate to obtain a humic acid separation product, thereby realizing the recovery of carbon resources in the humic acid wastewater.

more specifically, the concentration of humic acid in the humic acid wastewater is 50-1000 mg/L. The temperature of the constant-temperature water bath in the step (1) is 10-60 ℃. In the step (2), the pH is adjusted to 3-5. In step (2), HCl or NaOH with a concentration of 0.1M is used to adjust the pH. In the step (2), the addition amount of (3-aminopropyl) triethoxysilane is 1.0-10.0 mL/L. In the step (3), the high-speed stirring speed is 200rpm, and the stirring time is 10 min; the low-speed stirring speed is 50rpm, and the stirring time is 20 min; standing for 30 min. In the step (4), the precipitate is filtered by using medium-speed qualitative filter paper.

the present embodiment is shown in fig. 1, in which the effect of different conditions on the HA separation effect is examined. FIG. 1(a) shows the APTES dose (V)_APTES:V_solution1.0-10.0mL/L) on HA isolation. The HA separation efficiency is improved along with the increase of the dosage of the flocculant, when the APTES addition amount is 4.0mL/L, the HA separation efficiency reaches the maximum value of 95.5%, and when the addition amount is further increased to 10.0mL/L, the separation efficiency is reduced to 71.9%; FIG. 1(b) shows the effect of reaction system temperature on HA separation. When the temperature is increased from 10 ℃ to 35 ℃, the HA separation efficiency is gradually increased; while subsequently, when the temperature continues to rise to 60 ℃, the separation efficiency of HA decreases instead; FIG. 1(c) shows the effect of initial HA concentration on HA separation. Under the condition of a certain addition amount of APTES, the initial concentration of humic acid has great influence on the separation efficiency of the humic acid. When the initial HA concentration was increased from 50 to 1000mg/L, the separation efficiency decreased from 95.3% to 72.4%. Among them, when the HA concentration was increased from 150mg/L to 1000mg/L, the separation efficiency of HA was almost constant, indicating that the separation of HA was not strictly dependent on the concentration, and that satisfactory separation efficiency was obtained even at high concentration. FIG. 1(d) shows the effect of system pH on HA separation. pH value<When the pH value is 7.0, the HA is always separated with higher effect, the separation efficiency is 94.7-96.9%, and the maximum separation efficiency is obtained under the pH value of 3.0-5.0; but as the initial pH of the solution increased from 7.0 to 9.0, the separation efficiency decreased from 94.7% to 77.5%.

The method for recycling the carbon resources in the humic acid wastewater disclosed by the invention can be used for efficiently separating humic acid from the wastewater, so that the recycling of the carbon resources is realized. Simple process, low cost, high efficiency utilization of the nutrient components in the organic wastewater and high economic and social environmental benefits.

The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.