Study And Anlaysis On Technological Modification Of Coking Wastewater Treatment Process In Chongqing Iron & Steel Company

With the coal chemical industry's rapid development, environmental pollution problems involved have attracted the close attention of the relevant state departments and become unavoidable social problems. Its pollutants are not only gas and dust, more importantly wastewater.Coking wastewater is the industrial organic wastewater produced by the process of coal dry distillation, gas purification, and by-product recycling and refining, whose chemical component are extremely complex, as many as several hundred, including oil, volatile phenol, polycyclic aromatic hydrocarbons and oxygen, sulfur, nitrogen , and other heterocyclic compounds, and cyanide, sulfur, isothiocyanate and iron, magnesium, sodium and so on. Coking wastewater contains high concentrations of ammonia nitrogen substances, a trace of highly toxic CN-, SCN- and tar hard to be decomposed by biology, naphthalene, and other insoluble organic substances, which could all inhibit the microbes .So it is recognized as the intractable industrial wastewater by water treatment industry, whose treatment technology and process become a hot topic at home and joint research examples of the relevant scientific research institutes, universities and enterprises gradually increased. In this study, we have discussed the practice in the process of technological modification of coking wastewater treatment in the coke plant of Chongqing Iron and Steel Company, combining with the large amounts of data, engineering parameters and solutions in the process of modification. Furthermore, we summed up a series of data which could benefit the application of coking wastewater treatment technologyThrough the discuss on coking wastewater treatment technological modification it showed that: (1) from the denitrogenation technology, bioreactor, biological enhancing technologies, as well as physicochemical pretreatment, biological treatment method for coking wastewater treatment was an effective way and had a considerable prospect;(2) Coking wastewater treatment system in Chongqing Iron and Steel Company used the new highly efficient microbial technology HSB + O -A / O biochemical process after carefully domesticated and debugged to ensure that the treated effluent could achieve minimum technical indexes of coking industry cleaner production standard in China, and parts had reached the international advanced level;3) HSB efficient microbial technology as a kind of introduced biological enhancement technology has some features to guarantee that domesticated time of biochemical systems is short and debugging is fast. But in order to ensure long-term stable operation of the system, it's necessary to study the efficient localization bacteria to effectively master the biochemical characteristics of wastewater treatment system and guarantee the reasonable control of operating parameters;(4) Pure oxygen aeration technology can effectively improve the efficiency of oxygen transfer. And use of open-aeration tanks can effectively improve the sludge concentration and sludge properties of the settlement, which can be used as upgraded activated sludge biological denitrogenation methods; (5) GWQ diving - jet nozzle and the corresponding oxygen supply system could replace air aeration systems not to change the existing wastewater treatment facilities and direct debug system, thereby improving the capacity for sewage treatment and reducing alterations / expansion investment. At the same time, pure oxygen aeration technology can effectively reduce the cost of wastewater treatment operations. In particular, for the practical application of the metallurgical industry, it has congenital advantages and could effectively utilize its own oxygen resource.