| Coal chemical industry is a chemical process which taking coal for raw material and turning it into gas, liquid and solid fuel and other chemicals. But in the process of coal chemical industry, lots of wastewater generated with high organic content, ash, deep color and hard degradation material, which belongs to the high concentration of refractory organic wastewater. Therefore, to research and develop the coal chemical industry wastewater treatment technology of reasonable and efficient application will not only bring wide prospect for coal resources, but also make the water resources fully utilized, and reduce the pollution of the environment. This paper takes the process waste water of a coal chemical industry of Changchun city as the research object, The combined process of pretreatment of coagulation, anaerobic hydrolytic acidification biological contact oxidation of two stage biological treatment, Fenton treatment were to researched to treat the wastewater from coal chemical industry.The treatment effect of coagulation sedimentation pretreatment method of coal chemical wastewater was researched. According to the characteristics of the water quality of coal chemical wastewater, the control method of p H value makes wastewater emulsification state crack was selected; and the three kinds of cationic flocculant polymeric ferric sulfate, poly aluminum chloride, polymeric aluminum ferric chloride were selected to research the influence of COD,turbidity, static settling ratio from the aspects of dosage, initial p H value; and to determine the optimum dosage of flocculant, the optimum initial p H value, the optimal operation conditions of sedimentation time. The test results show that:coal chemical industry wastewater by the coagulation sedimentation need to use acid to adjust the p H value of less than 4 to crack the gel; polymeric aluminum ferric chloride(PAFC) was the best coagulant, the optimum reaction conditions for the initial p H=3.5, dosage was 300mg/L, optimum precipitation time was 0.5h.The anaerobic hydrolysis acidification biological contact oxidation process for coal chemical wastewater treatment effect was studied. The ABR was choosed as the anaerobic hydrolysis acidification reactor, the effects of HRT,temperature, volume load and other factors on the anaerobic hydrolysisacidification reactor efficiency were researched, the relationship between p H value and the hydrolysis and acidification effect was explored, the anaerobic hydrolysis acidification biodegradability of wastewater lifting effect were researched and the reaction mechanism was analyzed, and the optimum operation conditions was determined. The effect of HRT contact oxidation treatment on the efficiency of biological was investigated, the mechanism of microbial metabolism was analyed, and the optimum operation conditions was determined.The experiment results show that the ABR optimal operating conditions was HRT=24h at normal temperature, the removal rate of COD was 10.04%; the B/C of wastewater can increase to around 0.5; the best operation condition of biological contact oxidation pool was HRT=14h, the average removal rate of COD was 41.6%.The treatment effect of Fenton oxidation of coal chemical industry was studied. The impact of various factors on the treatment effect were analyzed, the reaction mechanism was initially revealed, and the optimal operating mode was determined, and the influence of each factor on the size of the test effect was analyzed through the orthogonal test. The results show that: the optimal operating conditions was p H=3, n H2O2/n Fe2+=3, H2O2 and Fe SO4 dosage were24.94mmol/L, 8.31mmol/L, reaction time was 1h, the effluent COD was less than or equal to 30mg/L, chroma was 15 times, the removal rate reached 91% and98%, respectively. The dosage of H2O2 and Fe SO4 was the maximum factor which effect on the removal. |
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