Sodium chloride-containing pesticide production wastewater resource treatment system and method

A technology for production wastewater and resource treatment, which is applied in biological water/sewage treatment, water/sewage treatment, natural water treatment, etc. It can solve the problems of waste water not being recycled, low organic carbon content, and adverse environmental effects, and achieve the realization of Recycling, less solid waste generation, and the effect of reducing the dilution factor

Inactive Publication Date: 2018-06-08
JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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Problems solved by technology

[0006] The present invention aims at the problems that the waste water existing in the prior art has not been fully resourced, the traditional waste water treatment method consumes a lot of energy, and the waste water treated by the traditional method still contains refractory substances, causing adverse effects on the environment. The present invention discloses A system and method for the treatment of pesticide production wastewater resources containing sodium chloride were developed. The method flow of salt-tolerant bacteria biochemistry, MBR, nanofiltration membrane, electrodialysis, and electrocatalysis was adopted. After the treatment method, the water quality of the produced water was good. It can be applied to the production of enterprises, and the water resources in the wastewater are recovered, and the total organic carbon content in the obtained sodium chloride salt wastewater is low. It can be used as a chlor-alkali plant for chlor-alkali production, and the sodium chloride salt in the wastewater is recovered.

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  • Sodium chloride-containing pesticide production wastewater resource treatment system and method

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Embodiment 1

[0038] The water quality characteristics of the pesticide production wastewater that needs to be treated are: pH of wastewater is 8.4, conductivity 32ms / cm, CODcr 7730mg / L, Na 33000 mg / L, NH 4 + -N 500mg / L, Cl 53000mg / L, SO 4 2- 4000mg / L.

[0039] The MBR membrane used is a flat membrane with a membrane pore size of 0.1~0.2um; the membrane module roll membrane of the nanofiltration membrane device used has a membrane pore size of 0.001-0.0001um; the reverse osmosis membrane used is a cellulose acetate roll membrane module; The dialysis membrane is a heterogeneous membrane; the electrocatalytic oxidation plate is used, the cathode is a titanium plate, and the anode is a titanium-based chlorine analysis plate;

[0040] The specific operation steps are as follows:

[0041] 1) Biochemical water distribution: According to the TDS concentration in the wastewater is 7.6%, the TDS of the wastewater is adjusted to 2%~8%, and the biochemical treatment is carried out. The water inta...

Embodiment 2

[0052] The water quality characteristics of the pesticide production wastewater that needs to be treated are: pH of the wastewater is 2.2, conductivity 42ms / cm, CODcr 8340mg / L, Na + 39000 mg / L, NH 4 + -N 300mg / L, Cl - 55000mg / L, SO 4 2- 5000mg / L.

[0053] The MBR membrane used is a flat membrane with a membrane pore size of 0.1~0.2um; the membrane module roll membrane of the nanofiltration membrane device used has a membrane pore size of 0.001-0.0001um; the reverse osmosis membrane used is a cellulose acetate roll membrane module; The dialysis membrane is a heterogeneous membrane; the electrocatalytic oxidation plate is used, the cathode is a titanium plate, and the anode is a titanium-based chlorine analysis plate;

[0054] Concrete operation steps are identical with embodiment 1.

[0055] During operation, the biochemical water distribution device adjusts the TDS of wastewater to 1.5%; the water flow rate of the MBR device is 350L / m - 2 d -1 ;Nanofiltration membr...

Embodiment 3

[0059] The water quality characteristics of the pesticide production wastewater that needs to be treated are: the pH of the wastewater is 10.1, the conductivity is 53ms / cm, CODcr5840mg / L, Na + 25000 mg / L, NH 4 + -N 200mg / L, Cl - 23000mg / L, SO 4 2- 3000mg / L.

[0060] The MBR membrane used is a flat membrane with a membrane pore size of 0.1~0.2um; the membrane module roll membrane of the nanofiltration membrane device used has a membrane pore size of 0.001-0.0001um; the reverse osmosis membrane used is a cellulose acetate roll membrane module; The dialysis membrane is a heterogeneous membrane; the electrocatalytic oxidation plate is used, the cathode is a titanium plate, and the anode is a titanium-based chlorine analysis plate;

[0061] Concrete operation steps are identical with embodiment 1.

[0062] During operation, the TDS of the wastewater adjusted by the biochemical water distribution device is 2.5%; the outlet flow of the MBR device is 250L / m - 2 d -1 ;Nanof...

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Abstract

The invention discloses a sodium chloride-containing pesticide production wastewater resource treatment system and method, and belongs to the field of a sewage treatment method. The system comprises asalt-tolerant bacterium biochemical system, a nanofiltration membrane device, an electrodialysis device and an electrocatalytic oxidation device, wherein the salt-tolerant bacterium biochemical system comprises a first salt-tolerant bacterium aerobic device, a salt-tolerant bacterium anaerobic device and a second salt-tolerant bacterium aerobic device; the second salt-tolerant bacterium aerobic device comprises a salt-tolerant bacterium MBR device; the treatment system also comprises a reverse osmosis device. The invention also discloses a wastewater treatment method. The flow process of themethod of the salt-tolerant bacterium biochemical treatment, MBR treatment, nanofiltration membrane treatment, electrodialysis treatment and electrocatalytic treatment is used; after the pesticide production wastewater is subjected to treatment, the water quality of produced water is high; when the system and the method are applied to enterprise production, water resources in the waste water are recovered; the general organic carbon content in the obtained sodium chloride salt wastewater is low; the system and the method can be used for chlor-alkali production; sodium chloride salt in the wastewater is recovered.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and specifically refers to a system and method for treating pesticide production wastewater resources containing sodium chloride. Background technique [0002] In the process of pesticide production, acids and bases such as hydrochloric acid, sulfuric acid, sodium hydroxide, and nitric acid are often used, as well as related salts such as sodium sulfate, sodium chloride, and sodium nitrate. Therefore, the main characteristics of pesticide production wastewater are: high salt (mass fraction of 3 %~30%), high organic matter (COD>10000mg / L), and the main salt component is sodium chloride salt. The treatment of this type of wastewater often reduces the salt content of the wastewater by dilution, and the discharge of the treated wastewater into the environment will not only cause environmental deterioration, but also lead to salinization of the soil and watershed. In addition, the or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/34C02F101/12
CPCC02F1/441C02F1/442C02F1/4672C02F1/4693C02F3/1268C02F3/284C02F3/30C02F3/34C02F9/00C02F2101/12C02F2103/343Y02A20/131
Inventor 王帅蒋伟群徐林兰夏苏敏
Owner JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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