A method for advanced treatment of pesticide wastewater

A technology for advanced treatment, pesticide wastewater, applied in natural water treatment, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as unsatisfactory treatment effect of dissolved organic pollutants

Inactive Publication Date: 2020-02-14
SHANGHAI NAXU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional chemical coagulation process includes coagulation and flocculation, which is not ideal for the treatment of dissolved organic pollutants, and the adsorption flocculant can quickly bridge in the sewage to form flocculation alum flowers, and quickly absorb pollutants on its surface. Precipitation separation and removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 50 g of alum in 195 g of water, add 0.1 g of nonionic polyacrylamide and 100 g of powdered activated carbon (170 mesh) to the alum solution, stir at 200 r / min for 30 min at 50 ° C, add 45 g of silicon Sodium acid was stirred for 60 minutes, and then stood still for 2 hours to obtain the adsorption flocculant.

[0022] First use 10% dilute sulfuric acid to adjust the pH of the wastewater to 3, then add 100 mg / L potassium ferrate, stir for 2 minutes, let stand for 20 minutes, add 800 mg / L hydrogen peroxide in batches for oxidative degradation for 1 h, add 10 % calcium oxide suspension to adjust the pH to 8, then add 19.5 g of adsorption flocculant, stir for 2 min, and let stand for 20 min. COD Cr The removal rate is 92.1%, and the removal rate of ammonia nitrogen is 80.4%.

Embodiment 2

[0024] Dissolve 50 g of alum in 195 g of water, add 0.1 g of nonionic polyacrylamide and 100 g of powdered activated carbon (170 mesh) to the alum solution, stir at 200 r / min for 30 min at 50 ° C, add 45 g of silicon Sodium acid was stirred for 60 minutes, and then stood still for 3 hours to obtain the adsorption flocculant.

[0025] First use 10% dilute sulfuric acid to adjust the pH of the wastewater to 2, then add 80 mg / L potassium ferrate, stir for 2 minutes, let it stand for 20 minutes, and then add 20 mg / L ferrous sulfate heptahydrate and 800 mg / L in batches. L of hydrogen peroxide was oxidatively degraded for 1 h, 10% calcium oxide suspension was added to adjust the pH to 7, and then 26 g of adsorption flocculant was added, stirred for 2 min, and allowed to stand for 20 min. COD Cr The removal rate is 94.6%, and the removal rate of ammonia nitrogen is 82.5%.

Embodiment 3

[0027] Dissolve 50 g of alum in 195 g of water, add 0.1 g of nonionic polyacrylamide and 100 g of powdered activated carbon (200 mesh) to the alum solution, stir at 200 r / min for 30 min at 50 ° C, add 45 g of silicon Sodium acid was stirred for 60 minutes, and then stood still for 2 hours to obtain the adsorption flocculant.

[0028] First use 10% dilute sulfuric acid to adjust the pH of wastewater to 3, then add 100 mg / L potassium ferrate, stir for 2 min, let stand for 20 min, add 800 mg / L hydrogen peroxide in batches for oxidative degradation for 1 h, add 10% calcium oxide suspension was adjusted to pH 8, then 19.5 g of adsorption flocculant was added, stirred for 2 min, and allowed to stand for 20 min. COD Cr The removal rate is 93.4%, and the removal rate of ammonia nitrogen is 81.7%.

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Abstract

The invention discloses a method for deep treatment of pesticide wastewater. Firstly, Fenton oxidation is adopted for pretreatment, and then the effect of efficiently removing CODCr and ammonia nitrogen is realized in combination with adsorption and flocculation. A Fenton reagent is improved and the oxidative degradation capacity of the reagent is improved; alum in an adsorption flocculant reacts with sodium silicate to produce aluminum hydroxide and silicic acid (silica) flocculent precipitates, the adsorption flocculant is combined with nonionic polyacrylamide and activated carbon, and the adsorption flocculation effect is improved; the sodium silicate replaces weak bases such as ammonia water, carbonate and the like, and rise of the ammonia nitrogen content and CODCr in wastewater is avoided. The method is applied to deep treatment of the pesticide wastewater and has higher oxidative degradation and adsorption and flocculation effects, and the removal rate of CODCr and ammonia nitrogen in the wastewater is high.

Description

technical field [0001] The invention relates to a method for advanced treatment of pesticide wastewater, in particular to a method for advanced treatment of pesticide wastewater by means of an efficient oxidation-adsorption flocculation method. Background technique [0002] Pesticide wastewater is wastewater discharged from pesticide factories in the process of pesticide production, because the quality and quantity of wastewater are unstable; the concentration of pollutants is high, and COD Cr Higher toxicity; in addition to pesticides and intermediates, the wastewater also contains toxic substances such as phenol, arsenic, mercury, and many substances that are difficult to biodegrade; it has a foul smell and is irritating to the human respiratory tract and mucous membranes. It has become a scientific research difficulty. According to statistics, the amount of wastewater discharged by pesticide production enterprises across the country is nearly 200 million tons, of which o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/283C02F1/5236C02F1/56C02F1/722C02F1/725C02F9/00C02F2101/306C02F2103/343C02F2301/08C02F2305/026
Inventor 何丹农严良童琴代卫国高小迪金彩虹
Owner SHANGHAI NAXU IND
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