Coking waste water treatment method and A / O technology apparatus

Abstract

The invention is an improvement of a coking waste water treatment method. The method comprises steps of oil removal, impurity removal, electrolytic disintegration and A / O technology, and is characterized in that a biological hydrolysis acidification is set after electrolytic disintegration and before A / O technology; the electrolytic disintegration is electrode energizing aerobic strong electrolysis; the A / O technology employs butterfly jet aerators that are arranged in large intervals and have circulating pumps; the waste water is treated with aeration, aeration stopping and forced internal circulation, stationary deposition and water draining period processing successively, so as to realize biological oxidation and nitration-denitrification in a same pool. Cooperative effects and coordination of each technology increase treatment effect, and treated outlet water can stably reach COD no more than 100mg / l and NH3-N no more than 15 mg / l; besides, land occupation is saved undera same treating capacity and is only 80% of that of a common technology; operating cost of per ton of water is low; and a treatment effect is stable.

Description

technical field [0001] The present invention is an improvement of the treatment method of coking wastewater, especially relates to a treatment of COD and NH 3 -N can reach the standard at the same time, and it is a coking wastewater treatment method with low treatment cost. Background technique [0002] Coking wastewater has a wide variety of pollutants and complex components, such as benzene, phenols, sulfides, cyanides, naphthalene, anthracene and other polycyclic aromatic hydrocarbons, heterocyclic compounds and other refractory organic substances, and contains high ammonia and phenolic compounds. (Phenolic compounds account for more than half of the total organic pollution) and a large amount of organic nitrogen, CN, SVN, sulfide, tar and other oily substances. The water quality varies greatly, and the biodegradability is poor. Inorganic pollutants such as substances and ammonium salts are highly toxic. It is a typical industrial wastewater with complex pollutants, man...

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Problems solved by technology

[0008] Although the above-mentioned prior art adopts different processes to treat coking wastewater and has certain effects, there are still some deficiencies, such as iron / carbon micro-electrolysis for the degradation of refractory organic matter, and micro-electrolysis itself has insurmountable shortcomings, such as iron bed The effect of micro-electrolysis is good at the beginning, but after running for a period of time, such as 7-15 days, the electrolysis effect is greatly reduced after the filler carbon is adsorbed, and it is easy to form channeling, and the cracking of some refractory organic substances is not thorough enough, so The actual effect of iron / carbon micro-electrolysis is unstable and difficult to degrade completely; micro-electrolysis has no effect on the removal of heavy metal ions in wastewater, and the presence of heavy metal ions will affect the improvement of microbial activity in subsequent biological treatment, which is also a factor affecting the treatment effect

Secondly, A / O, A 2 The / O denitrification efficiency is greatly affected by the reflux ratio. If the denitrification rate is to reach more than 75%, the aerobic reflux flow must be more than ten times that of the influent water. Although increasing the reflux ratio is beneficial to denitrification and denitrification, it will lead to Serious oxygen increase in the anaerobic section, coupled with the inevitable increase in oxygen in the reflux of the sub-tank A / O process, it is difficult to maintain an ideal anoxic state, which will affect the denitrification effect, and the denitrification rate is difficult to reach 90%. Increased operating costs and increased floor space

Furthermore, strong oxidation of oxidants is used in the process to break down refractory organics, which is unsafe to operate and the cost of oxidants is high

Therefore, the above-mentioned deficiencies all restrict the treatment of coking wastewater, resulting in unsatisfactory treatment effect, unstable treatment, large floor space and high operating costs.

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