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Not listed in the table the amount of other waste; plant part of the direct discharge of industrial waste water net. Factory Gas workshop based on production needs, the annual rate is very low car, and the resulting lower concentration of pollutants in wastewater, in order to save energy consumption, waste water plant will recycle such low concentrations. Second, sewage treatment process Sewage treatment plant process equipment and the structures according to their function, can be divided into four parts: pretreatment, biological treatment, after treatment, sludge drying. (1) pretreatment Pretreatment to ensure water quality and quantity do not produce large fluctuations, before entering the aerated pond water in the oil reduces the material and cyanide, to avoid the biological treatment plant by the impact of oil pollution and high load. Pretreatment process: Sewage water absorption wells, grease traps, secondary flotation, conditioning tank, thermostat pool, eventually into the aerated pond. The results show that: the gravity-type grease trap oil removal efficiency of advection on average about 60%, up 88%; air flotation oil removal rate of 90% by pretreatment degreasing, the water content in small mineral oil at 10mg / l, aeration of the effluent to meet the biological and chemical content of mineral oil requirements; water in the cyanide in the , air flotation with added Coagulant (PFS) in the Fe ionization is very small role in generating the complex [Fe (CN) 6] 4 -, [Fe (CN) 6] 3 +, level of cyanide removal rate of up to 80 air flotation %. Air Flotation Can also remove part of COD, but the removal rate is not high, averaging about 35%, a minimum of only 10% need to rely on a large number of chemical and biological removal of COD. Water temperature on the one hand by direct steam thermostat to ensure the pool, on the other hand rely on hot air to be guaranteed. Direct steam to water heating steam to the water, while some of volatile substances, such as ammonia, phenol and so on. After the water temperature by 2, in the cold season, aeration tank effluent temperature can be controlled in range of 25 ~ 35 . After the pretreatment of wastewater after the water quality could meet the biochemical requirements of this process, the indicators are: phenol 300mg / l; cyanide 5 mg / l; ammonia 500 mg / l; COD 2000mg / l; temperature of 25 ~ 35 . (2) biochemical treatment principle After pretreatment of coking wastewater and domestic sewage in the aeration tank section with wells in full uniform before the mixture into the biological aeration tank, according to the reflux ratio r = 1:5, mixed with treated effluent back to aerated pond with the first part. Sewage using biological denitrification - Nitrate Chemical industry Art. The process bacteria use nitrite, nitrate bacteria, denitrifying bacteria, respectively nitrogen, volatile phenol, cyanide oxidation decomposition of some type that can be used the following: NH4 +-N + O2 + HCO3- C5H7O2 + H2O + NO3-+ H2CO3 NO2-+3 H + 0.5N2 + H2O + OH- NO3-+5 H + 0.5N2 +2 H2O + OH - HCN + H2O CH2O = NH HCONH2 + H2O HCOOH + NH2 CO2 + H2O condition Wastewater treatment capacity: 42m3 / h Roots Fans Air flow: 88.6 m3/min Reflux ratio: r = 1:5 Aeration tank at the bottom of layout efficient hose high oxygenation by aeration, the pool of dissolved oxygen 3mg / l, can fully satisfy paragraph aerobic nitrifying bacteria dissolved oxygen requirements. The process of denitrifying bacteria, nitrifying bacteria on the temperature higher than the general requirements of bacteria are mesophilic bacteria, in 31 - 36 range of bacteria showed strong activity, the concentration of pollutants in water can compliance (other conditions under normal circumstances). Over this temperature range, deterioration of water quality, bacteria from the biochemical Membrane On off dead, black and far exceeded the water quality. Plant using steam and hot air are two ways to ensure that the temperature range of 31-36 . Aeration tank of the PH value of the soda ash to adjust, process design, build part of the denitrification section for the nitration section alkali consumption, soda ash dosage in the import section at the bottom of nitrification, with the pool water turbulence, PH pool is worth to adjust well to ensure that the microbes need to survive pH, soda ash dosage, as the PH value of the pool determined. Microbial growth and reproduction conditions except the temperature, PH value, the phosphorus must also be nutritious substances, adding NaH2PO4 factory methods used to supplement the shortage of phosphorus in wastewater, phosphorus dosage should not be too large, or lead to microbial crazy pool , fall off, resulting in excessive sludge pool, increasing fan load, wasted power consumption. The measure, phosphorus dosage 15Kg / day, 24 hours a day even adding. Day mud from the bottom of the pool situation, the remaining sludge can still be. treatment effect Put into operation in recent years sewage treatment facilities (equipment) to run more stable, A - O Process is running normally. In recent years, various kinds of pollutants treatment rate gradually improved each year, water up to standard three phase from stable to stable secondary transition and there is already a standard part of the index. 99 in the first half, some indicators have reached or exceeded 2 integrated emission standards, see Table (2). Sewage treatment compliance after some reuse out of focus, some discharged into urban sewage pipe network, and the effluent standards for the implementation of Integrated Wastewater Discharge Standard GB8978-1996 Table 4. (3) post-treatment Aeration tank effluent air flotation equipment sent for further inter-color, in addition to cyanide treatment, in order to achieve better emission quality. (4) sludge treatment , , grade flotation of scum, bottom flotation and deposition of tar sludge aeration tanks by the row, all together in the sludge tank, then liquid Sent to the sludge thickening tank, sludge concentration in the pond, the natural layer of sludge by gravity sedimentation, sludge thickening 2 to 3 days, write the upper liquid, the water content of 99% of the sludge to the sludge drying row of field (144m2). In the dry pit, part of the infiltration of water through the filter layer inside the pool at the bottom of the seepage control Yinjing in, then write out with the sludge concentration tank with the liquid back to set the upper wells; part of the natural process of water evaporation in the dry. Loss of water sludge as dry sludge. Dried sludge is transported to processing plants burning coal field blending. Annual output of about 5 tons of dry sludge. 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