Technological method for treating coking wastewater

A technology of coking wastewater and process methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem that COD is difficult to be effectively removed, affects the denitrification effect of the system, and increases the number of structures Volume and other issues, to achieve the effect of improving nitrification performance and load resistance, high treatment efficiency, and prolonging the sludge age

Active Publication Date: 2017-02-15
HUATIAN ENG & TECH CORP MCC +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, because coking wastewater contains a variety of refractory organic compounds, it is difficult to effectively remove COD in wastewater.
In addition, since the activated sludge method is generally used in the biochemical treatment process, this method requires a long sludge age to enrich the nitrifying bacteria, which will increase the volume of the structure and increase the construction cost. Sludge age and hydraulic retention time will affect the denitrification effect of the system

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  • Technological method for treating coking wastewater

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Effect test

Embodiment 1

[0027] The present embodiment is a kind of processing method of coking waste water, and this processing method comprises the following steps:

[0028] (1) The coking wastewater is subjected to ammonia distillation treatment and then enters the grease trap and the air flotation tank for oil-water separation;

[0029] (2) The coking wastewater after oil-water separation enters the regulating tank for water quality regulation;

[0030] (3) After the water quality is adjusted, the coking wastewater enters the iron+activated coke reactor to carry out the iron-carbon micro-electrolysis reaction and absorb the suspended particles in the coking wastewater;

[0031] (4) Enter the coking waste water flowing out of the iron+activated coke reactor into the biochemical treatment system for biological denitrification and removal of organic pollutants;

[0032] (5) Enter the coking wastewater after biochemical treatment into the secondary sedimentation tank and the coagulation sedimentation...

Embodiment 2

[0041] Based on the above embodiment, this embodiment has a preparatory process before step 3: mix the activated coke sintered at high temperature and crushed with iron filings or iron slag as filler, and set the filler in the iron + activated coke reaction device, wherein the particle size of the active coke is 1-4 cm, and the aeration treatment is carried out;

[0042] Aeration is carried out in the iron + activated coke reactor, on the one hand, Fe 2+ Fe produced by oxidation 3+ Gradually hydrolyzed to form Fe(OH) with a high degree of polymerization 3 Colloidal flocculants can effectively absorb and condense pollutants in water, thereby enhancing the purification effect of wastewater. On the other hand, after the micro-electrolysis reaction, the refractory organics can open rings and break chains to form simple organics that can be utilized by microorganisms. Iron + activated coke (carbon) can consume a large amount of hydrogen ions through the aeration reaction, which ...

Embodiment 3

[0045] Based on above-mentioned embodiment, when the biological denitrification of described step (4) and the removal treatment of organic pollutant, in described one-level MBBR aerobic pond and secondary MBBR aerobic pond, add mobile suspension carrier; The amount of the mobile suspension carrier is 30% to 50% of the pool capacity of the first-level MBBR aerobic pool, and 20% to 30% of the pool capacity of the second-level MBBR aerobic pool. The specific gravity of the carrier is 0.97-0.98kg / m 3 , the porosity is over 90%, and the specific surface area is over 500m 2 / m 3 ; And carry out aeration treatment.

[0046] In this example, more nitrosating bacteria are enriched by adding mobile suspension fillers, and short-range nitrification is realized by controlling parameters such as pH value, dissolved oxygen, and temperature. It can not only shorten the nitrification process and reduce the construction cost of structures, but also reduce aeration energy consumption and save...

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Abstract

The invention discloses a technological method for treating coking wastewater. The technological method comprises the following steps that (1) coking wastewater is subjected to ammonia distillation and oil-water separation sequentially; (2) coking wastewater after oil-water separation is subjected to water quality regulation; (3) coking wastewater after water quality regulation enters an iron+activated coke reactor for iron-carbon micro-electrolysis and suspended particles in the coking wastewater are absorbed; (4) coking wastewater flowing out of the iron+activated coke reactor is subjected to biological removal of nitrogen and organic pollutant removal treatment; (5) coking wastewater after biochemical treatment is subjected to coagulating sedimentation for mud-water separation; (6) mud after mud-water separation is subjected to thickening and dehydration treatment, and the coking wastewater after mud-water separation is subjected to deep ozonation treatment; the technology operates stably, the cost is low, the treatment efficiency is high, the load capacity resistance is high, and the operation is easy.

Description

technical field [0001] The invention relates to a process method for treating coking wastewater. Background technique [0002] Coking wastewater is wastewater with high content of phenol, high ammonia nitrogen, and high concentration of organic matter produced during coking, gas dry distillation, purification, and recovery of chemical products in coking plants. It has the characteristics of poor biodegradability, high toxicity, and strong inhibitory effect on microbial activity. [0003] At present, the vast majority of existing coking plants generally adopt a combination of pretreatment and biochemical treatment. Pretreatment includes ammonia distillation, extraction and dephenolation and decyanation, etc. The biochemical treatment process includes A / O (anoxic / aerobic), A 2 / O (anaerobic / anoxic / aerobic) etc. However, because coking wastewater contains a variety of refractory organic compounds, it is difficult to effectively remove COD in wastewater. In addition, since th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 白扬詹茂华程寒飞刘训东李启超
Owner HUATIAN ENG & TECH CORP MCC
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