Composite technology for coking wastewater treatment

A technology of coking wastewater and composite process, which is applied in multi-stage water treatment, anaerobic digestion treatment, biological water/sewage treatment, etc. It can solve the problem that effluent COD and ammonia nitrogen are difficult to meet the standards, the concentration of activated sludge is low, and the impact load is poor. problems, to achieve the effect of saving infrastructure costs, small footprint, and improving impact load resistance

Inactive Publication Date: 2016-07-06
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the process itself, there are disadvantages such as low concentration of activated sludge, poor impact load resistance, and easy sludge bulking, so it is difficult for the effluent COD and ammonia nitrogen to meet the standards.

Method used

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  • Composite technology for coking wastewater treatment
  • Composite technology for coking wastewater treatment
  • Composite technology for coking wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Set its operating parameters as follows: hydraulic retention time is 5 days, sludge reflux ratio is 100%, nitrifying liquid reflux ratio is 300%, and water temperature is controlled at 25-30°C. The specific steps are as follows:

[0029] (1) Coking wastewater is first pumped into the anaerobic tank by the sewage pump. In the anaerobic tank, the phosphorus accumulating bacteria release phosphorus and absorb easily degradable organic matter such as low-level fatty acids, which mainly play the role of anaerobic acidification and dilution and buffering of influent , HRT is 34h, dissolved oxygen is maintained below 0.1ppm;

[0030] (2) The coking wastewater diluted and buffered in step (1) enters the anoxic tank through overflow, and in the anoxic tank, the denitrifying bacteria convert the nitrate brought by the reflux of the nitrifying liquid into nitrogen and release it through biological denitrification into the air to achieve the purpose of denitrification, the HRT is 1...

Embodiment 2

[0036] Embodiment 2: The reflux ratio of nitrifying liquid in setting its operating parameters is adjusted from 300% to 400%, and the rest of the process parameters are the same as in Embodiment 1.

Embodiment 3

[0037] Embodiment 3: The reflux ratio of nitrification liquid in setting its operating parameters is adjusted from 400% to 500%, and the rest of the process parameters are the same as in Embodiment 1.

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Abstract

The invention discloses a coking wastewater treatment composite process, which comprises an anaerobic pool, anoxic pool, an aerobic pool, a membrane pool, and a backwashing pool; specifically, it is composed of the following steps: the coking wastewater enters the anaerobic pool, and in the anaerobic pool The phosphorus accumulating bacteria release phosphorus and absorb easily degradable organic matter such as low-level fatty acids, and then enter the anoxic pool for biological denitrification through overflow, convert it into nitrogen and release it into the air, and then enter the aerobic pool for biological nitrification It is converted into nitrate, and then enters the membrane tank to suck the water out to the backwash tank and backwash the hollow fiber membrane module regularly through the metering pump. The invention adopts a composite process to treat coking wastewater, and through the organic combination of biological treatment and membrane treatment, the nitrification capacity of the treatment system is improved, and a good treatment effect is achieved for coking wastewater with a COD concentration of 2500ppm and an ammonia nitrogen concentration of 300ppm.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a coking wastewater treatment composite process. Background technique [0002] With the rapid development of China's economy and the gradual advancement of urbanization, the demand for steel continues to grow, and the output of coke is increasing year by year. China is a major country in the production, consumption and export of coking products. According to statistics, in 2013, my country's coke The output is 476 million tons, and the national coke export volume is 4.673 million tons, which is 4.6 times the export value of the previous year. In 2014, my country's coke output will still maintain a slight growth trend. While the development of the coking industry has made a significant contribution to GDP growth, it has also caused great pressure on environmental pollution, especially in the process of coking high-temperature carbonization, gas purification and chemical product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F9/00C02F3/02C02F3/1268C02F3/28C02F2101/16C02F2101/345C02F2301/08
Inventor 刘崎峰闫少辉赵吉付志敏
Owner INNER MONGOLIA UNIVERSITY
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