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  Anaerobic expanded granular sludge bed technology
 
  Technical introduction
 
  The development of the anaerobic reactor has gone through three times.The third generation reactor,represented by EGSB,not only separate the solid residence time and hydraulic retention time,but also make the solid and liquid two phases fully contact,so that it can not only maintain a large amount of anaerobic activated sludge,but also make the wastewater and sludge fully contact and mix,in order to achieve real quality.High efficiency.
 
  EGSB is a highly structured reactor that can handle industrial wastewater in different industries.The wastewater is pumped into the anaerobic reactor in a mixing tank and a part of the anaerobic effluent,so that the hydraulic load entering the reactor will not be affected by the change of the original water quantity of the sewage treatment plant.Because the circulating waste water contains a large amount of alkalinity,it will reduce the consumption of alkali.
 
  The mixed wastewater of quenching and tempering is pumped into the bottom of the reactor through a specially designed influent distribution system.The wastewater then flows through the granular sludge bed and performs anaerobic reaction.There are three phase separators at the top of the reactor,which can separate the treated wastewater,biogas and sludge,even under the conditions of high hydraulic load.A large number of anaerobic effluent will reflow to the quenching tank to dilute the raw water,so that the toxic substances in the waste water can be diluted by reflux,reducing its concentration and degrading it.
 
  Because a large number of biological sludge is kept in the reactor for a long time and mixed well with the influent,the EGSB reactor can be applied in low temperature environment.The reactor is closed in an anaerobic environment to avoid oxidation(corrosion).In addition,the reactor is a pressurized system,and the biogas generated can be transmitted to the back unit for processing or utilization without using compressor and biogas buffer tank.
 
 
  Technical characteristics
  High volume loading,less land occupation and degradation of toxic substances.
  Strong ability to resist SS and unaffected by corrosion
  Rapid start-up and low sludge production
  The biogas produced can be reused and the hydraulic load will be strong.
  Nutrient consumption is low,construction methods and materials are selective.
  Low electricity consumption and low maintenance cost
 
 
 
 
  Carrier flow bed biofilm technology
 
  Technical introduction
 
  Moving Bed Biofilm Reactor(MBBR)is a biological fluidized bed technology based on special structural fillers.This technology combines biofilm and activated sludge process in the same biological processing unit to improve the processing capacity and treatment effect of the reaction pool,and enhance the anti impact ability of the system.At present,many sewage plants with carrier fluidized bed technology have been used in more than 20 countries around the world,including municipal,chemical,oil refining,pharmaceutical,paper and food.
  Technical characteristics
 
  The microorganism attached to the growth can reach a high biomass,and the total biological concentration in the reaction pool is 2~4 times as high as that of the activated sludge process,and the degradation efficiency of the pollutants is also multiplied.
 
  Microbes are attached to the surface of the carrier filled with special structure,and the microorganism is fully protected to prevent the loss of friction.At the same time,it can obtain good mass transfer effect in the system with stable biomass,higher activity and stronger impact resistance.
 
  The microbial sludge on the surface of the carrier is long(20~40 days),which is very beneficial to the reproduction of autotrophic microorganisms such as nitrifying bacteria,which are slow growing,and the ability of nitrification and denitrification is strong.At the same time,the bacteria pool in the reaction tank is more abundant,and the removal of refractory pollutants is significantly enhanced,and the effluent quality is significantly improved.
 
  The application of MBBR flow bed technology is flexible.The application of the new sewage treatment system can significantly reduce the area of land.When the existing system is upgraded,the project is easy to implement and can greatly improve the processing capacity and treatment effect.
 
 
  Membrane bioreactor technology
 
  Technical introduction
 
  MBR is a new type of wastewater treatment system which combines membrane separation technology with biological treatment technology.A membrane module is used to replace the two sedimentation tank at the end of the traditional biological treatment technology,and the activated sludge and macromolecule organic matter in the trench is intercepted by the membrane separation equipment immersed in the aerobic biological pool.
 
  Process principle
 
  By combining the membrane separation technology in the separation engineering with the traditional wastewater biological treatment technology,the MBR process not only saves the construction of the two sink,but also greatly improves the efficiency of solid-liquid separation,and increases the concentration of activated sludge in the aeration tank and the emergence of special bacteria in the sludge(especially the dominant bacteria group).The rate of biochemical reaction.At the same time,by reducing the ratio of F/M to reduce the amount of surplus sludge(or even zero),the problems of traditional activated sludge method are basically solved.
 
 
  Advanced catalytic oxidation technology
 
  Technical introduction
 
  Advanced catalytic oxidation technology is an advanced technology to deal with high concentration and refractory organic wastewater at present.The characteristic of this technology is that oxidant can achieve the purpose of multiphase catalytic oxidation under the action of high oxidation activity and high stable catalyst,and effectively degrade the refractory pollutants in wastewater.
 
  The new high efficiency catalytic oxidation technology developed by our company,three phase catalytic oxidation technology,uses the oxidants such as ozone or chlorine dioxide to produce and increase the free radicals in the reaction system through the catalytic action of the metal ion catalyst of the special carrier,thus producing a comprehensive and intense oxidation reaction to remove the reaction.Or decompose the high degradation of COD components.The reaction does not need to be carried out under high temperature and high pressure.Under normal conditions,the reaction can be achieved and the efficiency of oxidation treatment is very high.
 
 
 
 
  Ultrafiltration and reverse osmosis technology
 
  Technical introduction
 
  Reclaimed water,desalination and ultrapure water production depend on membrane filtration technology.Our company can choose the combined process of UF(Uitra-Filtration)and reverse osmosis(RO,Reverse Osmosis)to make high quality reclaimed water according to the water and reclaimed water quality requirements.
 
  Ultrafiltration is used to remove the turbidity,colloid substances,bacterial viruses and partial TOC of the original water,and then the high quality reclaimed water obtained by the reverse osmosis removal of dissolved solids can be used in boiler water supply.
 
  Technical advantage
 
  The quality of UF effluent is excellent.Therefore,a higher flux can be used in the design of RO system,thereby reducing the investment cost of RO system.
 
  Ultrafiltration has a high removal rate of suspended matter,microorganism and detached body,which reduces the cleaning frequency of the reverse osmosis system,reduces the operating cost and prolongs the service life of the reverse osmosis membrane.
 
  The whole system has a high degree of automation,intelligent physical cleaning and chemical cleaning.
 
  Compared with traditional membrane pretreatment,the recovery rate of water is higher,energy consumption is lower,the performance of recovery is better after chemical cleaning,and the floor area is less.
 
 
  Wastewater treatment technology with zero discharge
 
  Engineering survey
 
  In order to promote the coordinated development of the industrial economy and water resources and the environment,the"outline of China's water-saving technology policy",promulgated in 2005,first proposed to develop the technology of recycling waste water and"zero emission".The"national environmental protection"11th Five-Year"plan"explicitly calls for the promotion of waste water recycling in key industries,such as steel,electricity,chemical and coal,and efforts to achieve small or zero discharge of waste water.In recent years,strict wastewater discharge standards have been issued in some places.The Yellow River,Huaihe and other water pollution sensitive drainage areas,regional areas and provinces do not even allow industrial wastewater to be discharged to the surface water.Therefore,the pursuit of better treatment effect,stronger process stability,lower operating cost of wastewater treatment process,the realization of the"zero discharge of waste water"target,has become the development of the industry's own needs and external requirements.
 
  Technological process
 
  The evaporation cost is much higher than the membrane concentration cost.Zero emission technology can raise the recovery rate of membrane concentration unit as much as possible and reduce the amount of evaporation and crystallization system.At present,membrane concentrating technology is mainly in the following ways:
 
  (1)the use of ordinary reverse osmosis membrane;(2)to avoid the physical conditions of the formation of membrane fouling,using large channel disc membrane technology,mainly DTRO and DM;(3)positive infiltration technology;(4)electrodialysis(ED).
 
  The principle of the mechanical steam recompression(MVR)evaporator is to convert the electric energy into heat and increase the enthalpy of the two steam by using the two steam produced by the compression and evaporation of the high energy steam compressor.The two steam of the heat energy is heated to the evaporation chamber to achieve the heat of the circulating benefit of two steam.Evaporation is achieved through evaporator self circulation without external steam.Through PLC,industrial computer(FA),configuration and other forms to control system temperature,pressure,motor speed,to maintain system evaporation balance.Theoretically,the use of MVR evaporator saves more than 80%of energy than traditional evaporator,saving more than 90%of condensate and reducing more than 50%of the floor area.
 
  Multi effect evaporation(MED)multi effect evaporation is to allow the heated salt water to evaporate in a number of evaporators in series,and the vaporized steam from the former evaporator is used as the heat source of the next evaporator and condenses into fresh water.Multi effect evaporation technology is relatively early in domestic application and relatively mature in technology.
 
 
  Treatment and resource utilization of electroplating wastewater
 
  Engineering survey
 
  The waste water comes from all kinds of electroplating production lines,and the quality of the waste water discharged according to the different plating and electroplating methods is also different.The water quality of electroplating wastewater is complex and its composition is not easy to control.It contains chromium,cadmium,nickel,copper,zinc,gold,silver and other heavy metal ions and cyanides,some of which belong to carcinogenic,teratogenic,mutagenic and highly toxic substances.
 
  Technological process of wastewater treatment
 
  The electroplating wastewater requires all kinds of wastewater to be discharged and classified,and the water quality stability of the wastewater treated by wastewater treatment technology is better than that of all the pollutants in GB21900-2008.This technology is applicable to new or expanded electroplating wastewater treatment works.
 
  Technical route of resource processing technology
 
  After the treatment of heavy metal(electroplating)wastewater treatment,the wastewater reuse treatment technology has been applied to improve the 60%reuse rate of traditional process to more than 75%.The water quality of the system is far superior to the municipal water quality standard.The system water production can be directly reused to the electroplating production line,and the residual concentrated water is treated to the electroplating pollutants after treatment.Discharge of pollutant indicators in emission standard GB21900-2008.
 
  Technical characteristics
 
  This technology saves 50%of the floor area compared with the traditional electroplating wastewater treatment,and the removal rate of heavy metal ions is more than 98%.
 
  Using this technology to treat heavy metal wastewater,each index of treated effluent is better than the emission standard limit.The electrical conductivity of the treated effluent is stable less than 150 s/cm,and the index is much better than the municipal water quality standard.
 
  Using this technology and equipment,the electricity consumption is saved by about 30%compared with the traditional equipment under the precondition of reaching the standard.
 
  All process sections can be remote controlled and unattended by monitoring devices,so as to maximize labor cost for enterprises.
 
  This technology can control the cost of water under the price of industrial tap water,and it can also save costs for enterprises at the same time of environmental protection.
 
  The application of this technology can not only save costs for enterprises,but also reduce emissions for enterprises.It is in line with the trend of national environmental protection and creates good reputation for enterprises.
 
 
  Treatment and resource utilization of coal chemical wastewater
 
  Engineering survey
 
  Coking wastewater is a kind of industrial waste water containing volatile phenols,polycyclic aromatic hydrocarbons and oxygen,sulfur,nitrogen and other heterocyclic compounds containing volatile phenol,polycyclic aromatic hydrocarbons and oxygen,sulfur and nitrogen in the process of coking and gas in high temperature dry distillation,purification and by-product recovery.It is a kind of industrial organic wastewater with high COD,high phenol value,high ammonia nitrogen and difficult to deal with.Coking wastewater contains dozens of inorganic and organic compounds.The polycyclic aromatic hydrocarbons in the coking wastewater are not only difficult to degrade,but also are strong carcinogenic substances,which have serious environmental pollution,and have a strong environmental hazard,and their production is great,and the amount of water per ton of coke is larger than 2.5t in the coking wastewater.The concentration of pollutants in coking wastewater is high and difficult to degrade.Because of the existence of nitrogen in the coking wastewater,the nitrogen source of the biological purification is overdue,which brings great difficulties to the treatment of the standard.
 
  Technological process of wastewater treatment
 
  The coking wastewater treatment processes include physicochemical+SBR process,physicochemical+O/A/O process and physicochemical+A2/O method.In order to stabilize the effect of water,the+A2/O method is commonly used.This process has a long process and good technical treatment effect.The effluent can reach the first grade of the comprehensive discharge standard of sewage,and also can be used to extinguish the coke.
 
  Technical route of resource processing technology
 
  On the basis of deep understanding of all kinds of wastewater treatment and resource utilization technology,combined with the idea of"comprehensive waste water resource utilization technology"(NO.ZL201110329181.9,utility model patent number NO.ZL201120412746.5)of the invention patent of our company,this paper puts forward the utilization of waste water resources with the characteristics of coking enterprises.Using advanced oxidation and membrane processing as the main line,the advanced oxidation of different ways is used in different process sections,which ensures the stability of the water reuse system and the standard of water reuse.
 
  Technical characteristics
 
  The physicochemical pretreatment of+A2/O process has strong resistance to load impact and stable effluent quality.
 
  The removal rate of COD was over 96%,the removal rate of ammonia nitrogen was over 98%,the effluent COD was less than 150mg/L,and ammonia nitrogen was less than 5 mg/L.
 
  The advanced oxidation technology and multistage membrane treatment are combined to ensure that the water quality of the effluent reaches the standard:the water quality of the coke quenching and returning water reaches the pollutant discharge standard of Coking Chemical Industry(GB16171-2012).The water supplement quality of the circulating water reaches the quality index of the high quality reclaimed water in the guide for the management of the wastewater reuse in the refinery and chemical enterprises.
 
  The water and water balance of the system,except the water carried in the dry sludge,the rest of the water are used in the production process of the enterprise,and the wastewater has realized"near zero emission".
 
  The advanced oxidation technology is used in the pre oxidation and terminal oxidation of the reused treatment section to maximize the cost of operation.
 
  All process sections can be remote controlled and unattended by monitoring devices,so as to maximize labor cost for enterprises.
 
  The application of this technology can save the cost and reduce the amount of pollutant discharge for the enterprises,conforms to the trend of national environmental protection,and creates a good reputation for enterprises.
 
 
 
  Zero discharge treatment of desulphurization wastewater
 
  Engineering survey
 
  In order to maintain the balance of the material in the slurry circulating system of the desulfurization unit and prevent the soluble part of the flue gas from the chlorine concentration exceeding the specified value and ensuring the quality of the gypsum,a certain amount of waste water must be discharged from the system,and the wastewater mainly comes from the gypsum dewatering and cleaning system.The impurities contained in the waste water mainly include suspended matter,supersaturated sulfite,sulfate and heavy metals,many of which are the first type of pollutants that are strictly controlled by the national environmental standards.
 
  Technical route of wastewater treatment and zero discharge
 
  The conventional treatment process of domestic desulfurization wastewater mainly adopts physicochemical method to separate heavy metals and other precipitable salts by chemical and mechanical methods.The process is mature,simple in process and low in cost.In order to effectively recover and utilize desulphurized wastewater,based on the conventional treatment process,the advanced treatment and reuse of desulfurization wastewater and zero discharge technology were developed at home and abroad.At present,the commonly used techniques for treating desulfurization wastewater include membrane concentration(UF,NF,RO,DTRO,DM,positive permeation and electrodialysis),evaporation concentration(MVR,MED)and crystallization technology.
 
  Zero discharge treatment of high salt waste water in coal chemical industry
 
  Engineering survey
 
  High salt waste water in coal chemical industry is usually formed by the mixture of biochemical production wastewater,circulating water discharge sewage and RO concentrated water in desalted water station.After RO,the high COD,high calcium and magnesium,high dissolved silicon wastewater and the proportion of sulphuric acid root and chloride ion vary with the new fresh water source and the production process.In order to prevent fouling during the zero discharge treatment process,it is usually needed to soften calcium and magnesium and dissolve silicon.In order to prevent the organic matter from being concentrated and pollute the crystalline salt and cause the disqualification,the advanced oxidation is usually considered to remove the COD,and the zero row liquid discharge and the dissolution of the salt crystals are required.The refined sodium chloride salt in the alkali industry meets the standard of Glauber salt or sodium sulfate,which is the standard of industrial salt.
 
 
 
  Refinery wastewater treatment
 
  Engineering survey
 
  The components of refinery wastewater are complex,and organic compounds,especially short and its derivatives,are high in content and contain heavy metals.In addition to the general organic matter,the main pollutants are oil,fats,sulfides and ammonia nitrogen.The content of COD is high,and the difficult to degrade is much.Moreover,the pH change of the waste water is greatly influenced by the alkali waste water and the acid washing water.
 
  Technological process of sewage treatment
 
  According to the characteristics of refinery sewage,MBBR technology is adopted in the core of biochemical treatment.The stable effluent water quality is mainly benefited from the strong anti impact load capacity of the process.The high concentration of biomass and the characteristics of adhesion and growth in the MBBR reaction pool keep a high biological concentration in the reaction pool.The fluctuation of water quality can be rapidly decomposed to ensure the stability of the water quality.
 
 
 

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