One kind of wastewater treatment scheme for food processingplants - Summarize that different raw materials and wastewaterproduced by food processing plants in the process of processing aredifferent. A lot of water is used in the process, so a lot of wasteis discharged as sewage. In view of the fact that the sewagecontains a lot of emulsified particles and grease, the new airfloatation machine developed by our company can solve the problemwell and make the sewage discharge meet the discharge standard.
2. A sewage treatment scheme for food processing plants-processis generally: air flotation+anaerobic+aerobic biological contactoxidation method; air flotation-biological contact oxidationmethod, etc.
3. A Wastewater Treatment Scheme for Food ProcessingPlant-Process Description
A grille
The grid channel is located at the inlet end of the sewagesource in the regulating tank, and the design considers saving landand investment.
Artificial grilles are set up in the grille canal to interceptand remove the larger suspended solids and paper scraps in domesticsewage, so as to protect the pumps and subsequent pipeline systemsfrom blockage.
Oil Separation Regulating Pool
In the whole treatment system, a sewage oil isolation regulatingtank is set up. By adjusting the pool settings, the water can be fully balanced, the sewage can be more evenlyentered into the follow-up treatment unit, the impact resistance ofthe whole system can be improved, and the design scale of thetreatment unit can be reduced. It is conducive to reducingoperation costs and the impact of water fluctuations. Anair mixing device is installed in the regulating pool to preventprecipitation and to balance water . Set up the automaticlevel control device, the pump will automatically open according tothe level.
Anoxic pool
Because of the high organic composition in sewage and the goodbiodegradability of bod5/codcr=0.6, the biofilm method was adoptedin the design.
Because of the high content of organic nitrogen in domesticsewage, ammonia nitrogen will appear in the form of ammonianitrogen when biodegrading, so the ammonia nitrogen index in theeffluent will rise, and ammonia nitrogen is also a pollutioncontrol index. Therefore, an anoxic tank is added before contactingthe oxidation tank. The anoxic tank can denitrify the nitratebrought into the reflux mixture and the organic carbon source inthe influent, so that no_2 in the influent water can bedenitrified.- Nitrogen removal is achieved by reducing no3-to n2,and ammonia nitrogen value is degraded while organic matter isremoved.
Contact oxidation tank
Sewage is treated in the anoxic pond, flows into the contactoxidation pond, which entered into the stage of contact oxidation,aerobic treatment.
The contact oxidation tank is mainly a biofilm, biologicaltreatment device with activated sludge, by providing a source ofoxygen, organic wastewater by adsorption, microbial degradation,water purification.
Considering the contact oxidation for a long time should be inthe design process, internal elastic filler with high specificsurface area, filling rate is 70%, the specific surface area ofnearly 600m2/m3, in the area of design load should also fullyconsider the surrounding environment, to ensure better treatmentefficiency. Therefore the design load should choose a relativelylow value: 0.83kg/m3 day. Packing life in 8 years. The pool ofoxygen provided by rotary blower. The air-water ratio alsoconsiders a higher value: 15:1, aeration form: micro-pore aeration,aeration head considering the use of the current internationalwater treatment more advanced film aeration head. Never blocked thedevice during operation, with small pore aeration oxygenutilization rate, etc., compared with the traditional aerationform, has the advantages of There is nothing comparable tothis.
Contact oxidation is a biological treatment process with biofilmactivated sludge with. After sufficient oxygenation of the sewage,all submerged to a certain speed through the filler and filler, thefiller surface with biofilm and oxygenation of the sewage afterfull contact, the organic compounds in water by adsorption anddegradation, so that the sewage have evolved.
This design uses the three-dimensional elastic packinginternational advanced, not only the large surface area andexcellent flow characteristics.
Due to the large number of microorganisms are fixed on thesurface of the filler layer, forming a high concentration sludgebed, commonly known as a biofilm, it has strong resistance to shockloading.
The structure of activated sludge due to no or very smallamounts of suspension, and thus will not produce sludge expansion,which is a major feature of this method.
This is the key stage of producing packing layer biocutlivationand bed, as long as the operation of the early work, basically donot ask other during the operation.
sedimentation tank
The sewage through contact oxidation, biofilm activated sludgeand a small amount of production in the process of The newsupersedes the old. entrained oxide, and non biodegradable smallsolids into two sedimentation tank for solid-liquid separation. Thewater can be discharged to clarify. Sedimentation tank withinclined tube type, the total residence time of 4.0 hours,precipitation of sludge sludge is returned to the pool for furtherreducing excess sludge digestion. A water tank design into a toothadjustable liquid collecting tank, increasing precipitationeffect.
Fourth, a food processing plant, sewage treatment e -Classification
Centrifuge
Centrifuges are mainly used to separate solid particles fromliquids in suspensions; or to separate two incompatible li different densities in emulsions (e.g. to separate butter frommilk); they can also be used to remove liquids in wet solids, suchas drying wet clothes with a washing machine; special super-speedtube separators can also separate gas mixtures of differentdensities; different densities or particles can be used. Solidparticles of different settlement velocity in the liquid, somesettling centrifuge can also according to the density of solidparticles or particle size classification.
Sludge dewatering machine
Sludge dewaterer is characterized by automatic control,continuous production, stepless speed regulation, for a variety ofsludge.
Is suitable for water supply and drainage, papermaking, leather,textile, casting, chemical, food and other industries of sludgedewatering.
Aerator
The aerator is scattered by gas impeller, "micro bubbles"straight
