Pretreatment technology for coking and coalification sewage

Abstract

The invention discloses a pretreatment technology for coking and coalification sewage. The pretreatment technology comprises the following steps: leading ammonia distilling wastewater into an oil separating tank for stirring reaction precipitation through a mechanical stirring reaction oil separating device arranged in the oil separating tank; isolating and removing mazut, an emulsion, a sulfide, a cyanide and suspended matters in the wastewater, and achieving a function of deemulsification; leading the isolated wastewater into an adjusting tank for water quality adjustment and buffering treatment through the adjusting tank; leading the adjusted wastewater into an anaerobic tank for hydrolyze acidification treatment through an anaerobic reaction; leading the wastewater subjected to the hydrolyze acidification treatment into a pre-exposure tank; reducing the concentration of CODcr and degrading the content of NH3-N in the wastewater through pre-exposure nitration; leading the wastewater subjected to the pre-exposure nitration into a sedimentation tank finally; conducting precipitation and sludge circulation treatment on sludge in the wastewater through the sedimentation tank; conducting intermittent sludge discharging according to the ageing condition of the sludge. According to the pretreatment technology, the index content of CODcr, ammonia nitrogen, the cyanide, the sulfide, mazut, and the like in the wastewater can be removed and reduced.

Description

technical field [0001] The invention relates to a process for pretreatment of coking and coalification sewage. Background technique [0002] At present, the pretreatment process of high-concentration industrial wastewater (CODcr≥5000mg / L or above) such as coking and coal chemical industry is generally: regulating tank → oil separation → air flotation (dosing) → anaerobic (≤16h) → follow-up main biochemical process . [0003] The problems are: ①The adjustment tank needs to be dredged after a long time; ②The oil separation does not effectively play the role of oil separation; ③After the air flotation and dosing, if there is heavy slag that cannot be flotation, it will be brought into the follow-up system; ④It cannot be effectively removed and Reduce the indicators of influent sulfide and cyanide; ⑤The anaerobic residence time is too short to effectively cultivate anaerobic bacteria; Effective treatment; ⑦Nitrifying bacteria cannot be cultivated to effectively reduce the conc...

AI Technical Summary

Problems solved by technology

[0003] The problems are: ①The adjustment tank needs to be dredged after a long time; ②The oil separation does not effectively play the role of oil separation; ③After the air flotation and dosing, if there is heavy slag that cannot be removed by flotation, it will be brought into the subsequent system; ④It cannot be effectively removed and Reduce the indicators of influent sulfide and cyanide; ⑤The anaerobic residence time is too short to effectively cultivate anaerobic bacteria; Effective treatment; ⑦ Nitrifying bacteria cannot be cultivated to effectively reduce the concentration of ammonia nitrogen, so the total nitrogen index in the latter stage can hardly meet the new industry emission standard

⑧It will cause serious foam floating in the aerobic pool at the back stage, and take away the sludge, which will make the operating environment bad