Process and equipment for treating high-concentration pyridine waste water

A wastewater treatment and pyridine technology, which is applied in water/sewage treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc. The effect of high stability, short process flow, and low consumption of chemicals

Inactive Publication Date: 2011-08-03
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: aiming at the problem that the treatment of high-concentration pyridine-based organic wastewater is difficult, a high-concentration pyridine-based wastewater treatment process is established, so that the treated effluent can reach the first level of "Comprehensive Wastewater Discharge Standard" (GB8978-1996) standard

Method used

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  • Process and equipment for treating high-concentration pyridine waste water
  • Process and equipment for treating high-concentration pyridine waste water
  • Process and equipment for treating high-concentration pyridine waste water

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Embodiment 1

[0035] In the high-concentration pyridine wastewater of a pesticide company, the main pollutants were pyridine derivatives m-dichloropyridine and o-dichloropyridine. Using this process for treatment, the pH of the raw water is adjusted to 3.0, and the working current density of the multi-dimensional electrocatalytic oxidation section is controlled at 15mA / cm 2 , the residence time is 1 hour; then enter the micro-electrolysis reactor for treatment, maintain acidity (pH=about 4) and aeration and oxygenation, the reaction residence time is 1.5 hours; add Ca(OH) to the effluent 2 Adjust the pH of wastewater to 9.0, and add PAM for coagulation and precipitation reaction. The detection of the effluent after precipitation shows that the removal rate of m-dichloropyridine is 99.82%, the removal rate of ortho-dichloropyridine is 99.93%, and the removal rate of COD is 76%. Experiments have shown that the ring structure of pyridine in the physical and chemical treatment section has been...

Embodiment 2

[0037] The chlorpyrifos pesticide production workshop of a pesticide company contained high-concentration process wastewater of pyridines. The wastewater was reddish brown and had a strong pungent smell. Its main water quality indicators: pH 5-6, COD 36705mg / L, TOC 6312mg / L, TP 1835mg / L, salt content 16%. Adopt the process of the present invention to process. Pyridine wastewater is added with acid to adjust the pH to about 3, then enters the electrocatalytic oxidation reactor, and the current density is controlled at 14mA / cm 2 The residence time of wastewater is 60 minutes, and the effluent flows into the micro-electrolyzer; the micro-electrolyzer is filled with cast iron chips and coke, the iron-carbon volume ratio is 1:1, and an appropriate amount of acid is added to control the pH of the wastewater between 3-5, and the residence time of the wastewater 60min; the effluent directly enters the coagulation sedimentation tank, with Ca(OH) 2 Adjust the pH to about 8, and add co...

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Abstract

The invention relates to a process for treating high-concentration pyridine waste water, which comprises the following steps of: regulating raw water of waste water to be acidic, and treating the raw water in electro-catalytic oxidation equipment; leading effluent to a micro-electrolysis device for treatment under the condition of maintaining the acidity and oxygen enrichment of the waste water; regulating the effluent to be meta-alkalescent, and adding chemicals to perform coagulating sedimentation; and controlling the salinity of the waste water to be below 2 percent, and performing biochemical treatment in an anaerobic hydrolyzing device and a pressurizing biological contact oxidation device, so that the effluent reaches the conventional first-level standards for sewage discharge. Due to the adoption of a physico-chemical treatment process serving electro-catalytic oxidation as a core, pyridine pollutants can be decomposed effectively, the toxicity of the waste water can be reduced, and the biodegradability of the waste water can be improved; for biochemical treatment is realized by a combination process of anaerobic hydrolysis and pressurizing biological contact oxidation, the organic loads, treatment efficiency and salt-tolerant capacity of the biochemical treatment are improved; and the process has the characteristics of high impact load resistant capacity, good treatment effect and low operating cost, and the treated high-concentration pyridine waste water can reach the standard stably before discharge.

Description

technical field [0001] The invention belongs to the field of environmental engineering wastewater treatment, and is a treatment process and equipment suitable for high-concentration pyridine wastewater in fine chemical industries such as pesticides, feed additives, pharmaceuticals, and dyes. Background technique [0002] Pyridine is currently one of the most widely developed and applied varieties of heterocyclic compounds, and is an important fine chemical raw material. Its derivatives mainly include alkylpyridines, halogenated pyridines, and aminopyridines. According to statistics, about 70% of pesticides, medicines, veterinary drugs and organic chemical products need to use pyridine, so it is called the "chip" of chemical intermediates, and pesticides account for about 50% of the total consumption of pyridine series products. Additives are about 30%, and medicine and other fields account for 20%. In recent years, pesticide intermediates have developed rapidly, and pestici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/461C02F1/72
Inventor 邹敏刘秀宁汤捷吴剑杜小军陆继来
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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