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Method for removing pollutants in arsenic-containing sewage

A technology for pollutants and sewage, applied in the direction of water pollutants, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of ecological environment pollution, complexity, abnormal operation, etc., and achieve the effect of good application prospects

Active Publication Date: 2015-11-18
杭州英普环境技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of industrial sewage is relatively complex, especially a large number of artificially synthesized compounds entering the environment. Such substances are mainly ammonia nitrogen, sulfide and phosphorus-containing compounds. Due to the complexity of the structure of these substances, they cannot be decomposed and utilized by microorganisms in a short time. The traditional wastewater treatment method using activated sludge to cultivate and domesticate microorganisms can no longer effectively remove these pollutants. These substances have accumulated in the environment for a long time, causing great pollution to the ecological environment on which we live, and affecting human physical and mental health. bring great harm
A considerable number of industrial polluting enterprises in our country would rather be punished than invest in wastewater treatment. Even if there is a sewage treatment plant, the operation is extremely abnormal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for removing pollutants in sewage, comprising the steps of:

[0027] Preparation of composite microbial agent: mix the mixed bacterial liquid and the carrier according to the weight ratio of 1:1, stir evenly, then leave it to stand for 6 hours, and finally put it in 4°C for low-temperature drying, and control the water content at 6% after drying, to obtain final product The carrier is obtained by mixing bamboo charcoal, chitosan and diatomaceous earth according to the mass ratio of 2:2:1; the above-mentioned mixed bacteria liquid is mixed by the raw material bacteria of the following parts by weight: 10 parts of Rhodococcus, 9 parts of Thiobacillus denitrificans , 7 parts of Pseudomonas stutzeri, 6 parts of Sphingomonas, 5 parts of Bacillus pumilus, 2 parts of Phanerochaete chrysosporium; the concentrations of the above-mentioned raw material bacteria were all controlled at 1×10 8 pieces / ml.

[0028] Sewage pretreatment: First, the sewage NH3-N is 300mg / L, sul...

Embodiment 2

[0031] Use DNAMAN software to design primers, respectively add enzyme cutting sites, synthesize the nucleotide sequence PHY gene according to the amino acid sequence NP_745067.1 whole gene, obtain the target fragment through amplification, and obtain the target gene PHY through PCR amplification (simultaneously The corresponding mutation sites 62K / G, 80E / V, 93V / H, 120R / I, 131F / P, 143Q / S, 152P / Q, 169G / I, 179Q / A, 192Q / G, 241W were identified by multiple PCR / S, 258R / T, and 263R / P were introduced into the gene sequence to obtain different mutant genes), and the PCR product was double-digested with the added restriction sites, and the cloned expression vector was also double-digested pEASY Connected, the successfully verified recombinant plasmid was transformed into the Rhodococcus ATCC15906 strain to obtain arsenic-degrading genetically engineered bacteria.

Embodiment 3

[0032] Example 3 Verification of the sewage treatment effect of Rhodococcus genetically engineered bacteria and other several bacterial agents

[0033] According to the method of Example 1, the corresponding sewage treatment experiment was carried out, and the sewage and the sewage of Example 1 belonged to the same batch and had the same concentration of pollutants. Wherein each component composition of bacterial agent is identical with embodiment 1.

[0034]The genetically engineered bacteria of different mutation sites described in Example 2 were used to carry out the reaction of removing arsenic, and it was found through experiments that 62K / G, 80E / V, 93V / H, 120R / I, 131F / P, 143Q / S , 152P / Q, 169G / I, 179Q / A, 192Q / G, 241W / S, 258R / T, and 263R / P mutants all have significantly enhanced effects compared to the original strain. The total treatment time is not more than 4 days, and the result is as follows: the sewage is the same batch of sewage, so as to ensure the same conditions...

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PUM

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Abstract

The invention relates to a method for removing pollutants in arsenic-containing sewage. The method comprises the following steps: firstly carrying out solid-liquid separation on sewage to remove large solid particle substances; then feeding the liquid into a settling pond; carrying out precipitation for 12 hours; removing solid floccules through a circular hole filter screen; feeding the liquid filtered by the circular hole filter screen to a bio-reaction pond; adjusting the PH to 7; feeding the liquid once a day: 10 g / day / cm3, and continuously feeding the liquid for one week; and finally, leaving the liquid to stand for 3 days, and discharging the liquid. The method provided by the invention can be used for effectively removing pollutants containing ammonia, nitrogen, sulfur and phosphorus and arsenic, is low in input cost and has a relatively good application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for removing pollutants in sewage. Background technique [0002] With the development of industrial production and the improvement of people's living standards, the volume of industrial sewage and urban domestic sewage is increasing at an alarming rate. One of the reasons for threatening the human living environment. [0003] In order to meet the continuous improvement of the public's requirements for environmental quality, the country has formulated more and more stringent emission standards for nitrogen. Research and development of economical and efficient nitrogen removal treatment technology has become the focus and focus of water pollution control engineering research. Although there are many methods that can effectively remove ammonia, such as physical methods include reverse osmosis, distillation, and soil irrigation; chemical methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/34
CPCC02F1/001C02F3/34C02F3/348C02F9/00C02F2001/007C02F2101/103C02F2101/16C02F2101/20C12N1/14C12N1/20
Inventor 李娜
Owner 杭州英普环境技术股份有限公司
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