Method for treating pyridine wastewater

A treatment method, pyridine-based technology, applied in water/sewage treatment, special compound water treatment, light water/sewage treatment, etc., can solve the problems that pyridine-based wastewater cannot truly reflect the pollution degree, sludge death, pyridine difficulty, etc.

Active Publication Date: 2016-09-07
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main characteristics of pyridine wastewater: (1) pyridine is difficult to be oxidized by potassium dichromate, so the evaluation of pyridine wastewater by COD index cannot truly reflect its pollution degree; (2) pyridine has a strong inhibitory effect on biological bacteria in biochemical processes or toxicity, resulting in the failure of biochemical treatment, because the pyridine substances in the wastewater are not biochemical, the sludge is dead, and the biochemical treatment system is paralyzed; (3) There are many kinds of substances with pyridine rings, but they all have a common characteristic ring structure , the substance is stable and difficult to degrade, and pyridine and its derivatives are more stable than benzene
[0005] At present, the treatment methods of pyridine-containing wastewater are mainly advanced oxidation treatment + biochemical, rectification, resin adsorption and incineration, but the investment and treatment costs are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of 2,3-dichloropyridine production wastewater, which is dark red, TOC is about 6564mg / L, 2,3-dichloropyridine content is 1.917g / L, 3-chloropyridine content is 0.319g / L, sodium chloride The content is 20%.

[0028] (1) Complexation filtration: adjust the 2,3-dichloropyridine production wastewater to pH=8, based on the wastewater quality, add 2% ferrous sulfate heptahydrate, stir for 20 minutes, and filter.

[0029] In the filtrate, TOC=2720mg / L, 2,3-dichloropyridine content was 0.09585g / L, and 3-chloropyridine content was 0.00319g / L.

[0030] (2) Light Fenton: adjust the pH of the effluent in step (1) to be 3.5, add 3% hydrogen peroxide (the mass concentration of hydrogen peroxide is 30%) based on the quality of the effluent in step (1), and irradiate with an ultraviolet lamp for aeration reaction After 2 hours, adjust the pH of the obtained effluent to 9, based on the quality of the effluent, add 1‰ activated carbon, stir for 20 minutes, and filter.

[0031] Th...

Embodiment 2

[0033] Adopt the method described in embodiment 1, difference is only, after the pH of waste water is adjusted to 3 in step (1), add ferrous sulfate heptahydrate to carry out complexation, in the filtrate that obtains after processing, TOC=4356mg / L, 2 , 3-dichloropyridine 1.0927g / L, 3-chloropyridine 0.1627g / L.

Embodiment 3

[0035] A kind of 2,3-dichloropyridine production wastewater, which is dark red, TOC is about 6564mg / L, 2,3-dichloropyridine content is 1.917g / L, 3-chloropyridine content is 0.319g / L, sodium chloride The content is 20%.

[0036] (1) Complexation filtration: adjust the 2,3-dichloropyridine wastewater to pH=8, based on the quality of the wastewater, add 2% copper nitrate, stir for 20 minutes, and filter.

[0037] The TOC of the filtrate was measured to be 2642 mg / L, the content of 2,3-dichloropyridine was 0.08972 g / L, and the content of 3-chloropyridine was 0.00256 g / L.

[0038] (2) Light Fenton: the effluent pH of the adjustment step (1) is 3.5, with the effluent quality of the step (1) as a benchmark, add 0.5% ferrous sulfate and 3% hydrogen peroxide (the mass concentration of hydrogen peroxide is 30%), After irradiating with ultraviolet light and aeration reaction for 2 hours, adjust the pH of the obtained effluent to 9. Based on the quality of the effluent, add 1‰ of activat...

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Abstract

The invention discloses a method for treating pyridine wastewater. The method comprises the following steps: step 1, adjusting the pH of the wastewater to 5-10, adding heavy metallic salt to react, forming an insoluble complex and filtering to obtain treatment liquid; step 2, regulating the pH of the treatment liquid to be acidic and performing Fenton oxidation. The heavy metallic salt is at least one of soluble iron salt, soluble copper salt, soluble cobalt salt and soluble manganese salt. When the mass of the wastewater is taken as a reference, the adding quantity of the heavy metallic salt is 0.5-10 percent. In the step 2, when the mass of the treatment liquid is taken as a reference, 0-2 percent of ferrous sulfate and 0.5-10 percent of hydrogen peroxide are added into the treatment liquid to perform the Fenton oxidation, and the mass percentage of the hydrogen peroxide is 30 percent. According to the method for treating the pyridine wastewater, disclosed by the invention, the removal rate of pyridine substances reaches 95 percent or higher, and the final effluent water meets national standard emission requirements.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating pyridine wastewater. 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%. [0003] Pyridine is a colorless liquid at room temperature and can be completely miscible with water or most commonly used organic liquids such as alcohol, ether, petroleum ether, ketones, benzene and other solvents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/38
CPCC02F1/32C02F1/5236C02F1/722C02F9/00C02F2101/38C02F2305/026
Inventor 李晓伟王路峰孔令鸟吴勇前
Owner ZHEJIANG QICAI ECO TECH CO LTD
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