CN102910766A - Pendimethalin pesticide wastewater treatment process - Google Patents

Abstract

The invention discloses a pendimethalin pesticide wastewater treatment process which comprises the steps of iron-carbon coagulation, sodium hypochlorite oxidation and the like. Through the pendimethalin pesticide wastewater treatment process, pendimethalin wastewater and isopropyl tail gas alkali washing wastewater are selected for co-treatment, so that the aims of treating wastes with processes of wastes against one another, reducing the load of degradation-resistant organic pollutants in the wastewater, improving the biodegradability of the wastewater, removing the pollutants in the wastewater and improving the biodegradability of the wastewater are achieved; and the process is safe, advanced, clean and low in wastewater treatment cost.

Description

The pendimethalin pesticides waste water treatment process

Technical field

The present invention relates to a kind of pesticides waste water treatment process, relate in particular to a kind of pendimethalin waste water treatment process, belong to field of environment protection.

Background technology

Pendimethalin belongs to the dinitroaniline selective herbicide, this product is applicable to various crop, broad weed-killing spectrum, can be applied to the various crop fields such as corn, peanut, soybean, cotton, green onion, ginger, garlic, leek, wild cabbage, preventing and kill off multiple annual gramineae and the part broadleaf weedss such as barnyard grass, Herba Eleusines Indicae, lamb's-quarters, purslane, cyperus iria, lady's-grass, is present one of classic dry land herbicide in the world.But the waste water that pendimethalin produces does not in process of production have ripe effectively industrialization improvement method both at home and abroad so far.The multiple hazardous contaminant such as nitrobenzene-containing in this waste water, B/C ratio is about 0.08, and this contaminated wastewater substrate concentration is high, acidity is high, colourity is high and toxicity is high, and is large to the Ecotoxicology effect, biological degradability is poor, belongs to high density, difficult degradation class agricultural chemicals waste water.

Summary of the invention

For solving the problem of above existence, for the characteristics of pendimethalin waste water, in pre-treatment, its composition is destroyed, make it have biodegradability, the invention provides a kind of pendimethalin pesticides waste water treatment process, its technical scheme of taking is: these technique concrete steps are as follows:

1) iron carbon-coagulation

Pendimethalin waste water and different ester tail gas alkaline cleaning waste water successively enter equalizing tank, regulate after pH value is 2, add iron filings and gac and carry out the reaction of iron carbon, after being reacted to the pH value and being 5-6, filter by plate-and-frame filter press behind adding lime and the polyacrylamide coagulation;

2) hypochlorite oxidation

Waste water after the filtration enters oxidizing tower, open to stir, regulating waste water to pH value with sulfuric acid is 6-9, and adding accounts for chlorine bleach liquor's oxidation 2 hours that the wastewater volume amount is 10-20%, keeping temperature of reaction is 20 ℃-30 ℃, and the waste water after the oxidation enters at last the AAO biochemical device and processes.

The present invention adopts the effectively pretreatment technology such as iron carbon-coagulation, hypochlorite oxidation, difficult degradation class organic pollutant load in the decrease waste water, improve the biodegradable of waste water, remove the pollutent in the waste water, reach the purpose of the biodegradability that improves waste water.

The present invention is for optimizing the wastewater treatment resource distribution, select weedicide pendimethalin waste water and different ester tail gas alkali wash water combination treatment, the treatment of wastes with processes of wastes against one another, with the acid waste water of pendimethalin and different ester tail gas alkaline cleaning scale wastewater neutralization, the pH value of regulating waste water is to enter iron carbon-coagulating treatment after 2.This technique also makes the COD of waste water reduce by 55% when saving alkali and consuming, and has reached reduced investment, working cost is low, optimizes the purpose of wastewater treatment structure.

The pH value scope that the present invention has groped the hypochlorite oxidation reaction by a large amount of orthogonal experiments is 6-9, temperature of reaction is 20-30 ℃, reaction times is 2 hours, the volume ratio of clorox and waste water is 10-20:100, significantly improved the oxygenolysis efficient to the water Pesticides, the COD clearance is up to 60%.For improving the efficient of oxidizing reaction, to carry out under this oxidizing reaction normal temperature and pressure, reacting balance, easily-controlled operation have improved the speed of reaction.Difficult degradation, high stability contaminant removal capacity are surpassed conventional water technology comprehensively, and the clorox amount that this art breading unit water yield consumes is low, can the decrease cost for wastewater treatment.

The beneficial effect that the present invention has is: the organism of the pendimethalin waste water difficult for biological degradation of can effectively degrading, the eco-toxicity safety of assurance water outlet, and non-secondary pollution; System's water outlet toxicity reduces greatly, biodegradability brings up to 0.33 by 0.08, through the biological treatment of A/O method, effluent quality reaches the general protective belt standard in " Shandong Province's south water to north water pollutant comprehensive discharge standard along the line " (DB37/599-2006) after the water outlet dilution; This waste water treatment process safety, advanced, cleaning, cost for wastewater treatment is low.

Embodiment

Embodiment 1: use the pendimethalin waste water of Huayang Agricultural Chemial Group Co Ltd, Shandong as pending water, adopt iron carbon-coagulation, hypochlorite oxidation technique to process.

The concrete technology step is as follows:

1) iron carbon-coagulation: utilize different ester tail gas alkaline cleaning waste water to regulate pendimethalin acid waste water, pendimethalin waste water is after regulating, regulating the pH value is 2, add iron filings and gac and carry out the reaction of iron carbon, after being reacted to the pH value and being 5-6, filter by plate-and-frame filter press after adding lime, polyacrylamide (PAM) coagulation;

2) hypochlorite oxidation

Waste water behind iron carbon-coagulation enters oxidizing tower, open and stir, regulate waste water ph at 6-9 with sulfuric acid, the 10-20%(volume ratio that adds wastewater flow rate) NaClO solution, keeping temperature of reaction is 20 ℃-30 ℃, oxidation 2 hours, last water outlet enters AAO biochemical device (sewage disposal of anaerobic-anoxic-oxic activated sludge process) and processes.

Water quality after the pendimethalin wastewater treatment is as shown in table 1 below:

Water-quality guideline contrast before and after the wastewater treatment of table 1 pendimethalin

Embodiment 2: utilize certain insecticide factory's pendimethalin waste water as pending water, adopt iron carbon-coagulation, hypochlorite oxidation technique to process.

The concrete technology step is as follows:

1) iron carbon-coagulation: utilize different ester tail gas alkaline cleaning waste water to regulate pendimethalin acid waste water, pendimethalin waste water is after regulating, and regulating the pH value is 2, carries out the reaction of iron carbon, after being reacted to the pH value and being 5-6, filter by plate-and-frame filter press after adding lime, PAM coagulation;

2) hypochlorite oxidation

Waste water behind iron carbon-coagulation enters oxidizing tower, open and stir, regulate waste water ph at 6-9 with sulfuric acid, the 10-20%(volume ratio that adds wastewater flow rate) NaClO solution, keeping temperature of reaction is 20 ℃-30 ℃, oxidation 2 hours, last water outlet enters AAO biochemical device (sewage disposal of anaerobic-anoxic-oxic activated sludge process) and processes.

Water quality after the pendimethalin wastewater treatment is as shown in table 2 below:

Water-quality guideline contrast before and after the wastewater treatment of table 2 pendimethalin

Claims (1)

1. pendimethalin pesticides waste water treatment process is characterized in that the concrete technology step is as follows:

1) iron carbon-coagulation

Pendimethalin waste water and different ester tail gas alkaline cleaning waste water successively enter equalizing tank, regulate after pH value is 2, add iron filings and gac and carry out the reaction of iron carbon, after being reacted to the pH value and being 5-6, filter by plate-and-frame filter press behind adding lime and the polyacrylamide coagulation;

2) hypochlorite oxidation

Waste water after the filtration enters oxidizing tower, open to stir, regulating waste water to pH value with sulfuric acid is 6-9, and adding accounts for chlorine bleach liquor's oxidation 2 hours that the wastewater volume amount is 10-20%, keeping temperature of reaction is 20 ℃-30 ℃, and the waste water after the oxidation enters at last the AAO biochemical device and processes.