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Biologically-enhanced treatment method for cyanide-containing chemical wastewater

A bio-augmentation and chemical wastewater technology, applied in the field of water treatment, can solve the problems of secondary pollution and high treatment costs, and achieve the effects of reducing treatment costs, wide application prospects, and ensuring stability

Active Publication Date: 2016-03-30
TIANJIN CARING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the object of the present invention is to provide a kind of method that utilizes bioaugmentation to carry out the comprehensive treatment of cyanide-containing chemical industry wastewater, solves the problem such as the high processing cost that uses chemical method to deal with cyanide-containing wastewater at present, produces secondary pollution etc.

Method used

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  • Biologically-enhanced treatment method for cyanide-containing chemical wastewater
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preparation example Construction

[0041] Next, the filler is prepared, that is, the film-forming filler is hung on a shelf, and placed in the primary reaction pool to be formed. The film-hanging filler chooses a combination of fillers, that is, the aldehyde fiber or polyester yarn is pressed on the double-circle large plastic ring, so that the fiber bundles are evenly distributed, so that the inner ring is a snowflake-shaped plastic branch, which can not only hang the film, but also effectively cut the air bubbles, improving The transfer rate and utilization rate of oxygen enable the water-air biofilm to be fully exchanged and the organic matter in the water to be treated efficiently. The unit diameter is Φ150mm, the spacing is 80mm, and each cubic meter contains 100 units.

[0042] Next, the above nutrient solution is added to the primary biochemical reaction tank, and then the fermentation bacteria solution is added, mixed evenly, and then expanded and cultivated in an aerobic state for 2-3 days. Wherein, th...

Embodiment 1

[0046] A pigment company in Shandong produces wastewater with a cyanide concentration of 178mg / L, a COD concentration of 526.96mg / L, and a salinity of 4.6%. Due to the high salt content of the water, some salt-tolerant bacteria were added, and the high-salt decyanation-resistant bacteria group was domesticated by gradually increasing the salinity, and the microbial enhanced bacterial agent was obtained, and the film was hanged in the first-level biochemical reaction tank. Treat and inoculate it. The water is first pretreated by flocculation and sedimentation to remove part of the salt and reduce biochemical pressure. The water is decyanated in the first bioreactor with the addition of glucose as a nutrient. After decyanation treatment, the secondary biochemical reaction is carried out through hydrolysis acidification and activated sludge treatment. At this time, the concentration of cyanide in the effluent is 5mg / L, and the COD is about 200-300. Therefore, ozone is used to t...

Embodiment 2

[0048] The wastewater composition of a coking plant is T-N content 410mg / L, COD content 5650mg / L, NH 3 The -N content is 378mg / L, and the cyanide concentration is 43mg / L. Through the analysis of water quality, it was found that the wastewater contained organic substances such as pyridine, quinoline, phenol, o-cresol, naphthalene and n-hexadecane. Bacteria, quinoline-degrading bacteria, phenol-degrading bacteria, o-cresol-degrading bacteria, naphthalene-degrading bacteria and n-hexadecane-degrading bacteria (for details, see another application number of the applicant is 201410833844.4 patent application), forming a composite bacterial agent, in the Enrichment and domestication are carried out in the coking wastewater to obtain the microorganism-enhanced bacterial agent of the wastewater, and the above-mentioned method is carried out to form a film, and inoculated in the first biochemical reaction tank.

[0049] The water is firstly pretreated by the air flotation grease trap ...

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Abstract

The invention discloses a biologically-enhanced treatment method for cyanide-containing chemical wastewater. The method comprises steps as follows: a pretreatment step: the cyanide-containing chemical wastewater is pretreated in an adjusting tank; a primary biochemical reaction step: the pretreated wastewater is sent into a primary biochemical reaction tank inoculated with a microorganism enhanced microbial agent for a reaction, and the microorganism enhanced microbial agent comprises cyanide removal flora and a special microbial agent; a secondary biochemical reaction step: the wastewater completing the primary biochemical reaction is sent into a hydrolyzation and acidification tank, passes by a sedimentation tank and then enters an aerobic reaction tank containing activated sludge to complete a secondary biochemical reaction; a follow-up treatment step: the wastewater completing the secondary biochemical reaction is subjected to follow-up treatment after passing by the sedimentation tank. By means of the treatment method, the concentration of cyanide in the chemical wastewater can be effectively reduced, the treatment cost is reduced, the activated sludge is prevented from being infected by cyanide, residual chlorine or other oxidants, the water discharge stability is guaranteed, and the treatment method has good environmental and economic benefits.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for comprehensively treating cyanide-containing chemical wastewater by using biological reinforcement. Background technique [0002] As a chemical raw material, cyanide is often used in synthetic rubber, fiber and dye industries, such as the most common acrylic fiber in textiles. In the process of industrial application, a large amount of cyanide-containing wastewater will be produced. And most cyanides are highly toxic, and a small amount of cyanides will pollute water bodies and cause poisoning incidents. Therefore, cyanide-containing wastewater must be decyanidated before it can be discharged. [0003] Cyanide in chemical wastewater has strong biological toxicity and inhibitory effect, and in the usual chemical wastewater treatment, the biological treatment process with activated sludge as the main body is usually adopted, and when the concentration of cyanide in the ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/18
CPCC02F3/30C02F3/34C02F9/00C02F2001/007C02F2101/18C02F2301/08
Inventor 杨华军刘范嘉杨贝贝马皛梅
Owner TIANJIN CARING TECH DEV
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