Domestic sewage is separated from septic tanks and a large number of large particles such as feces and paper scraps, and the supernatant liquid enters the conditioning tank to adjust the water quality and quantity. The effluent is lifted by the pump to the hydrolytic acidification tank. The pond is equipped with the latest type of composite packing. A large number of bacteria and higher levels of microorganisms can attach to the surface of the filler and grow to form a biofilm. When the wastewater passes through the filler in the acidification tank, the anaerobic fermentation bacteria on the filler are rammed, fiber, and rammed Discussing the tomb, mashing the fiber, ramming, flowing, and delighting, how are you?
Production processes such as chemical industry, coal liquefaction, tar chemical industry, calcium carbide acetylene chemical industry, chemical product recycling, etc. convert coal into gaseous and liquid state. For solid products and various chemical products, the main wastewater generated by this process includes coking wastewater, gasification wastewater and liquefaction wastewater. Wastewater refers to the residual ammonia water formed during high-temperature carbonization coking and gas cooling, and the final cooling cycle of the gas generated during the gas purification process.
Wastewater containing phenol and cyanide pollutants discharged during the production of chemical products such as fresh water replacement and tar refining, crude benzene refining, product recycling, etc. Raw wastewater wastewater type: pickling wastewater, in domestic agricultural and sideline food processing industries, The washing industry has developed rapidly. Pickling is a method of processing aquatic products with salt as the main pickling component. The treatment of pickling wastewater has always been a major problem in vegetable processing. Natural gas companies and environmental research institutions. Wastewater Hazards: Untreated high pollution (COD, BOD, SS) and high salinity wastewater from marinated and immersed food processing enterprises. The water evaporated during gasification is condensed, and then sent to the condensate of the spray cooling system and usually contains Phenol gas washing wastewater.
Pollutants such as petroleum and ammonia nitrogen. Liquefaction wastewater refers to wastewater generated during coal liquefaction. Liquefaction usually includes direct liquefaction and indirect liquefaction. Direct liquefaction is the hydrogenation of raw coal under high temperature and pressure, which reduces the molecular weight of complex high molecular organic matter in the coal. The organic liquid hydrocarbon process produces wastewater containing a large amount of ammonia nitrogen and sulfide. Indirect liquefaction is based on coal gasification products. Under certain conditions, during the process of synthesizing liquid petroleum and chemical products by adding catalysts, the wastewater mainly contains acids, alcohols and ketones.
Chemical treatment refers to the use of chemical principles and chemical action to convert the pollutant components in sewage into harmless substances, so that the sewage is purified. After chemical treatment, the chemical properties of the pollutants change, and with the chemical changes, the food industry The chemical treatment method is wastewater including neutralization, coagulation, electrolysis, redox, ion exchange and membrane separation. Chemical redox is the conversion of pollutants in wastewater. Coal chemical wastewater characteristics: 1. Complicated composition and high concentration of pollutants: Coal chemical companies produce a large amount of wastewater with complex water quality, containing a large amount of solid suspended particles, and high concentrations. Contains a large number of refractory pollutants, such as phenols, polycyclic aromatic hydrocarbons, sulfur, benzopyrene, quinoline, indole, biphenyl and so on. The COD and chromaticity of toxic, harmful, and difficult-to-degrade organic pollutants such as petroleum, and various inorganic pollutants such as ammonia nitrogen and sulfide are higher in wastewater.
On the basis of summarizing the domestic and foreign domestic sewage treatment plant operating experience, combined with China ’s scientific research results and engineering practices, it adopts international advanced biological treatment technology to design a set of landfillable organic wastewater treatment devices. Can remove BOD5, COD and NH3-N at the same time. The technical performance is stable and reliable, the treatment effect is good, the investment is small, and it has automatic operation, convenient maintenance operation, no land occupation, no building, no heating? It is harmful and biodegradable: Many organic pollutants in coal chemical wastewater are difficult to degrade and are therefore harmful.
Toxic substances can cause central nervous system poisoning, leading to paralysis and suffocation; phenols are highly toxic and have direct toxicity to various biological cells. It can cause dizziness and insomnia, and erode the mucosal epidermis. High concentration ammonia nitrogen in coal chemical wastewater enters receiving water body. It will make the water body stink, easily cause water body eutrophication, seriously damage the water source ecosystem, and coal chemical wastewater contains some organic matter. High content of cycloaromatic hydrocarbons, difficult to degrade. They exceed the tolerance limits of microorganisms in wastewater and are toxic to microorganisms. Due to the survivability of wastewater, its biodegradability is poor.
Based on the principles of ultrasonic cavitation, shearing, flocculation, and deep oxidation, this equipment uses a septic tank grill tank adjustment tank ultrasonic deep oxidation equipment to accelerate the reaction equipment static disinfection filtering equipment discharge process, so that the treated sewage completely meets R. The requirements of national standard GB18466-2005 "Water Pollutant Discharge Standards for Medical Institutions" have been tested by environmental protection organizations, health and epidemic prevention departments and several hospitals across the country4. Process description 1. Pretreatment of coal chemical wastewater is very important. According to different water quality conditions, the wastewater is pretreated to meet the following biological treatment requirements.
Q: Wastewater pretreatment mainly includes deoiling, dephenolization, ammonia evaporation, SS removal (coagulation sedimentation in the primary sedimentation tank) and removal of toxic, harmful or refractory organic matter (dehydration). Deep oxidative pretreatment was performed to solve the problems of thiocyanide crushing, etc. A too high concentration of a certain substance in the wastewater would produce biological toxicity, and the biological toxicity could be reduced through pretreatment.
For example, the phenolic wastewater produced by the Shenhua Group Coal Liquefaction Project contains a large amount of hydrogen sulfide, ammonia and phenol. The H2S and most of the NH3 in the wastewater are removed by stripping in the tower, the phenolic compounds are extracted with isopropyl ether, and the concentrations of H2S, NH3 and phenol are reached after pretreatment. Within the scope of biological treatment, after biological treatment, the effluent water quality meets the rehydration requirements of the circulating water field.
The sludge deposited in the inclined tube sedimentation area enters the sludge area through hydraulic pushing and natural sedimentation. In order to ensure the thoroughness of sludge discharge in the sludge area, the sludge area of each water purifier is divided into several compartments with partitions. Each compartment is equipped with an electric sludge drainage system and an auxiliary sludge drainage device. The dredger drainage system consists of several parts. l Set of electric mud discharge valve and pressure inlet solenoid valve. The dredging pipe adopts a perforated pipe structure. The dredging system uses wear 2. The traditional physical and chemical methods of a / o biochemical treatment are expensive. The current sewage treatment technology in China is mainly biological method, supplemented by physical and chemical technology and living method.
Chemical treatment can be divided into aerobic treatment, anaerobic treatment and anaerobic-aerobic combined treatment. The principle of aerobic treatment technology is that microorganisms use various organic pollutants as nutritious food. Under the action of enzymes that are decomposed by microorganisms, they are broken down into simple compounds, water and carbon dioxide to obtain the substances and activities required by their cells. The energy needed to achieve the purpose of nutrition. Including life activities such as growth and reproduction, the microorganisms that decompose organic matter are mainly bacteria, and other protozoa and ammonia nitrogen concentrations have been greatly reduced, but some difficult-to-degrade organic matter can still cause waste water color and nitrogen content.
COD cannot meet the discharge standards, and the wastewater after biochemical treatment needs to be further treated. Advanced treatment methods include adsorption and mixing. Coagulation sedimentation method, immobilized biological method, advanced oxidation method, reverse osmosis method, etc.
The purpose of coagulation treatment with an integrated water purifier is to remove colloids and suspended solids in water. Therefore, the coagulation effect of water is often evaluated by the size of flocs, sedimentation speed, and residual amounts of colloids and suspended solids in water, which affects The coagulation factors include the pH of the water and the amount of coagulant. Ant, water temperature, mixing speed of water and coagulant, impurities in water, contact medium, etc., our company can pass the coagulation test ?. Notes on coal chemical wastewater 1. Control the quality and quantity of influent water According to the original statistical data of water quality and quantity of the main sources of sewage and the design plan, determine the quality and quantity of water entering the sewage treatment system.
The SBR method was developed as early as 1914, but due to complex manual management, backward monitoring methods, and blockage of aerators, it is difficult to promote. With the development of science and technology, these problems have been resolved. At present, there are non-blocking aerators and online monitoring instruments, especially the development of automation technology. Sewage treatment can run automatically. The SBR method has received widespread attention for its unique advantages. In recent years ?. In order to reduce the load of subsequent biochemical treatment, reduce the load of toxic substances, stabilize the effect of subsequent biochemical treatment, and facilitate operation and management.
The wastewater should be pre-treated before entering the system, and the following points should be noted during the pre-treatment:
(1) If the influent COD fluctuates too much, controlling the influent COD content will have a greater impact on the system operation. Therefore, the influent COD should be strictly controlled according to the design requirements to meet the design requirements.
(2) Treating condensate gas wastewater and turbidity and diverted turbid water by gravity-isolated oil-gas flotation (oil content lower than condensate gas wastewater). When the oil content is lower than the concentration that affects the normal growth of microorganisms, it is discharged into the regulating tank.
(3) In order to reduce the ammonia nitrogen partially evaporated wastewater, a fixed ammonia decomposition device is used to reduce the ammonia nitrogen concentration from 800mg / L to 250mg / L, and then discharged into the regulating tank.
According to the theory of shallow sediments, the inclined pipe is set to accelerate the sedimentation. The large particle floes formed rapidly in the lower part of the reaction zone will change the flow direction between the two inclined pipes and increase the chance of contact between the small particle floes. When the water flows through the upper inclined pipe, the chance of contact between the particles and flocs will be further increased, thereby improving the quality of the effluent water. The floc suspended matter is rectified in an inclined pipe area.