| Coal chemical industry wastewater is coalification factory produces a hard biodegradable industrial wastewater, containing cyanide, benzene series, phenolic substances, such as for microbial survival is very bad, There is no more cost-effective way to deal with this kind of industrial waste water. So the research of wastewater treatment technology can not only deal with the wastewater effectively, reduce the pollution to the environment, and can be the basis on the development of coal industry technical support.As the research object, based on the coal chemical industry wastewater by coagulation sedimentation, Fenton oxidation, SBR secondary biological treatment and advanced treatment of activated carbon adsorption process to deal with the coal chemical industry wastewater.Focuses on the main operation parameters, the influence factors and the comprehensive efficiency of combination process, and provide the foundation for the technologies of coal industry.In coagulation sedimentation treatment experimental research stage, the focus of poly aluminum chloride iron(PAFC), polymeric aluminum chloride(PAC) and polymeric ferric sulfate(PFS) optimization experiment, finally by the experimental study and comparative analysis by PAFC as coagulant. Research to determine optimum parameters of PAFC coagulant: initial p H3.5, PAFC dosing quantity is 400mg/L, the settling time is 45 min, under this condition, COD removal rate can reach more than 70%, chromaticity is about 180 times,the turbidity is 8.67 NTU.Study phase in Fenton oxidation, discusses the best process parameters, determination of H2O2 / Fe2 + mole ratio of 1:1, H2O2/COD ratio is 1.25, the reaction time of 120 min. After Fenton oxidation treatment residual COD water for about 400mg/L, B/C is greater than 0.7,achieved the purpose of improve the biological availability.In SBR biochemical treatment study phase, to determine the optimal hydraulic retention time HRT is 8h, gas is 0.2m3/h, the COD removal rate can reach 66%, ammonia nitrogen removal rate can reach more than 90%.Activated carbon advanced treatment study phase, the experimental results show that thevelocity of 2~3m/h, every 60 g of activated carbon, adsorption saturation time of 2.9h.Activated carbon additive quantity is 20g/L, in between 45min~60min of chromaticity removal rate is greater than 30 min ~ 60 min, but after more than 40g/L, two basic consistent.All in all, coal chemical industry wastewater by coagulation sedimentation treatment,Fenton oxidation, SBR biochemical treatment and activated carbon adsorption depth after the combination of the four stages of processing, the final effluent COD can be maintained at about 30mg/L, chromaticity 10 times, ammonia nitrogen concentration is almost zero, has reached the "Integrated wastewater discharge standard"(GB8978-1996) in the level 1 of emission standards. Therefore, this combination process method of coal chemical industry wastewater treatment effect is good, the technology is feasible. |
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