Wastewater treatment process of dimethoate pesticide

A pesticide wastewater and treatment process technology, applied in the chemical field, can solve the problems of high energy consumption and lengthy treatment process, and achieve the effect of shortening the pretreatment time

Inactive Publication Date: 2010-12-15
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wang Jun disclosed in his patent (CN1752025 A) a method for degrading organophosphorus pesticides by ultrasonic method; Wang Xiaojun et al. invented a water treatment device for ozone heterogeneous catalytic oxidation (CN201077792 Y); Hou Yu et al. (CN101659467 A) discloses a method for treating sewage by using Fenton’s method; Method wastewater COD cr The removal rate is high, but the treatment process is still lengthy and the energy consumption is too large

Method used

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  • Wastewater treatment process of dimethoate pesticide
  • Wastewater treatment process of dimethoate pesticide

Examples

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Embodiment 1

[0022] Embodiment 1: prepare dimethoate pesticide waste water 15L with the former medicine of dimethoate pesticide, its COD cr Concentration is 4000mg / L, after photo-assisted Fenton oxidation pretreatment for 30min, hydrogen peroxide (H 2 o 2 ) and ferrous sulfate (FeSO 4 ·7H 2 O) It is a one-time dosing at the beginning of the reaction. During the reaction, ultraviolet light is always used to irradiate FeSO 4 The dosage is 22mmol / L, H 2 o 2 The dosage is 90mmol / L, the pH value is 3, and the power of the ultraviolet lamp is 20W. Fenton Process Effluent Chemical Oxygen Demand (COD cr ) removal rate was 74.7%. After the pretreatment reaction, the effluent is diluted to twice its volume, and enters the CAST process for biological treatment for 7 hours (1 hour for water inflow, 4 hours for aeration reaction, 1 hour for standing and settling, and 1 hour for decanting (draining) water), During the reaction process, the air-water ratio is controlled at 6:1, the drainage ratio...

Embodiment 2

[0023] Embodiment 2: prepare dimethoate pesticide waste water 15L with the former medicine of dimethoate pesticide, its COD cr Concentration is 4000mg / L, after photo-assisted Fenton oxidation pretreatment for 30min, hydrogen peroxide (H 2 o 2 ) and ferrous sulfate (FeSO 4 ·7H 2 O) It is a one-time dosing at the beginning of the reaction. During the reaction, ultraviolet light is always used to irradiate FeSO 4 The dosage is 15mmol / L, H 2 o 2 The dosage is 75mmol / L, the pH value is 3, and the power of the ultraviolet lamp is 30W. Fenton Process Effluent Chemical Oxygen Demand (COD cr ) removal rate was 71%. After the pretreatment reaction, the effluent is diluted to twice its volume, and enters the CAST process for biological treatment for 6 hours (1 hour for water inflow, 3 hours for aeration reaction, 1 hour for standing and settling, and 1 hour for decanting (draining) water). During the process, the air-water ratio is controlled at 7:1, the drainage ratio is 6:1, th...

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Abstract

The invention relates to a wastewater treatment process of a dimethoate pesticide, in particular to a wastewater treatment method of the dimethoate pesticide, and belongs to the technical field of chemistry. Wastewater of the dimethoate pesticide is subjected to photo-assisted Fenton oxidation treatment for 15 to 120 minutes (min), effluent is diluted to reach twofold volume after a reaction is finished, and the diluted effluent is subjected to biological treatment for 5 to 8 hours (h) through a cyclic activated sludge process (a CAST process for short); the wastewater of the dimethoate pesticide is only subjected to Fenton process pretreatment and the CAST process, so the wastewater treatment process is superior to a method which is used for treating the wastewater by combining three processes of photo-assisted Fenton, flocculation and micro-biological degradation and is reported in an invention publication (CN1636983A); the optimum time required by a Fenton pre-reaction process does not exceed 0.5 hour, and compared with that of the conventional method, the pretreatment time is shortened greatly and is superior to time required by various pretreatment processes in a document, namely 'the summarization of a pretreatment method of organophosphorus pesticide wastewater'; and the final CODcr removal rate of the wastewater of the dimethoate pesticide can reach 95 percent.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and in particular relates to a method for treating dimethoate pesticide wastewater. Background technique [0002] Dimethoate is an organophosphorus pesticide widely used to kill insects and mites, and it is one of the main insecticides used in production and use at home and abroad. Dimethoate pesticide wastewater has the characteristics of high pollutant concentration, high toxicity, and refractory degradation. Traditional dimethoate pesticide wastewater treatment methods mainly include coagulation method, adsorption method, biochemical method, etc., but the above-mentioned common methods have poor pretreatment effect, Processing time and other issues. [0003] Advanced oxidation process is a new type of sewage treatment process that has emerged in recent years. It has the advantages of strong oxidation capacity and short treatment time, such as Fenton oxidation, ozone oxidation, ultrasonic ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/72
Inventor 张英民李开明杜馨周伟坚王炜
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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