Coking wastewater is by high temperature carbonization, raw coal gas purification and refining process of chemical products.Waste water composition is complicated, the water quality changes according to the raw coal composition and coking technology.Nuclear magnetic resonance (NMR) chromatogram shows: coking wastewater containing dozens of inorganic and organic compounds.Of inorganic compounds is mainly a large number of ammonium salt, sulfur, cyanide, sulphide, cyanide, etc., organic compounds, in addition to the phenols, and ring and polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, sulfur, oxygen, and so on.In a word, coking wastewater pollution is serious, is a prominent environmental problems in the discharge of industrial waste.In-depth study of coking wastewater advanced treatment technology, is the real problems facing the current economic construction, also is the focus of future technical research, we should seek both efficient and economic processing technology, improve the environment quality, realize the recycling of water resources.
　　The coking production process release a large amount of phenol, cyanide, oil, poisonous and harmful material such as ammonia nitrogen wastewater.Coking wastewater mainly comes from coking and gas purification process and the chemical products of refined process, occurring in the process of steam with helium surplus ammonia water as the main source.Steamed ammonia wastewater is mixed surplus ammonia distillation after the discharge of waste water.Surplus ammonia water is the most important of phenol cyanogen waste water, coking plant is a high concentration of ammonia containing phenol water, by condensation blast section circulating ammonia pump discharge, to the surplus ammonia water storage tank.Surplus ammonia water is mainly composed of three parts: hygroscopic water on the surface of the furnace charging coal and furnace coal carbonization of bound water and add to suction gas pipeline and gas collector loop oxygen pump in oily wastewater treatment process.Surplus ammonia 14% according to furnace coal.In surplus ammonia water storage tank and other production equipment from the mixed wastewater, called hybrid surplus ammonia water.Mix of surplus ammonia water, have a plenty of direct steaming ammonia, have a plenty of steamed ammonia after removing phenol first, have a plenty of steamed ammonia and ammonia rich together, still have a plenty of take off with desulfurization rich fluid sauerkraut ammonia, acid filtering before steamed ammonia oil removal.Coking plant also contains some other wastewater, the proportion is not big, pollution index is low, also will not covered here.

　　cokingWastewater characteristics
　　Coking wastewater contains pollutants including phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, sulfur, etc., is a kind of typical industrial wastewater containing refractory organic compounds.Coking wastewater of easily degradable organic matter is mainly phenolic compounds and benzene compounds, arsenic luo, naphthalene, furan, narrow azole as part of the biodegradable organic matter.Refractory organic matter mainly arsenic organism, carbazole three PCB, PCB, etc.
　　Water quality of the coking wastewater by GeChang technological process and production operation mode difference is very big.General steamed ammonia wastewater quality coking plant are as follows: CODcr3000mg/L, 600-900 mg/L, phenol cyanogen 10 mg/L 50-100 mg/L, oil, ammonia nitrogen around 100-300 mg/L.If the CODcr at 3500 mg/L, ammonia nitrogen at 280 mg/L, the coke can be produced at least 0.65 per ton kgCODcr and 0.05 kg of ammonia nitrogen.
　　The dangers of coking wastewater
　　Coking wastewater discharged directly without treatment, it will cause serious pollution to the environment.
　　Coking wastewater is also called phenol cyanogen waste water, which in addition to containing a large number of phenol and cyanide, ammonia nitrogen, and a small amount of indole, benzopyrene, naphthalene and indene (a), some of these trace organic matter in has been identified as carcinogens, and not easily biodegradable, this kind of high concentrations of toxic waste is the focus of the coking plant wastewater treatment.
　　1. The harm of water, and aquatic life.
　　Coking wastewater is mainly contain organic matter, most of the organic matter is biodegradable, can consume dissolved oxygen in water.When the concentration of oxygen in water is lower than a certain threshold, the survival of aquatic animals would be affected.When the water of oxygen consumed, water quality is worse.Other substances such as oil and suspended solids in the wastewater, cyanide to water and fish have harm, such as nitrogen compounds can cause eutrophication of water bodies.
　　2. The toxic to the human body.
　　Wastewater containing phenols are prototype poison, can through the skin and mucous membrane contact inhaled and oral and invading the body inside, make human body cell lose vitality, on the other hand, can also be further to the deep penetration, cause deep tissue injury or necrosis;Low-level phenol can also cause skin irritation, long-term consumption of wastewater containing phenol can cause dizziness, anemia, and a variety of neurological disorders.
　　3. The harm to agriculture.
　　4. Untreated coking sewage irrigation, farmland, can make crops and dies.Oily materials in sewage blocking soil porosity, soil salinity, soil salinization.

　　Technological process:
　　Domestic general treatment of coking wastewater by physicochemical + biochemical method, first by separation tank and air flotation granule flotation to remove oil, and then by blowing off harmful material such as the removal of phenol, ammonia and sulphur cyanogen, again through the A2 / O biological method to deal with, biochemical effluent into coagulation reactors further removal of COD and oil.At last, through the secondary filter to remove phenol and COD to ensure that the system effluent standards.