slaughter house sewage/ waste water/ wastewater treatment equipment

slaughter house sewage/ waste water/ wastewater treatment equipment

1,Sewage characteristic

Water quality content low and steady, better degradability, belong to low concentration sewage

2,Process confirm

Traditional sewage treatment process can divide into biological membrane manner and activated sludge manner, biological membrane suitable to small water volume,steady water quality ,low concentration sewage water quality, better system commission. Steady back operation, better operability. Sewage water quality set as traditional routine: COD_Cr ≤300mg/l,BOD₅ ≤200mg/l,

Combine our company past success practice, suggest sue biofilm manner treatment process, plan to adopt A/O biological contact oxygen process as main treatment manner.

This project with high organic ingredients, BOD5/CODcr=0.6 , better biodegradability , due to ammonia nitrogen and organism content is high, especially organic nitrogen, when biological degradation organism, the organic nitrogen will be express in the form of ammonia nitrogen, ammonia nitrogen is a key pollution control index, so such sewage treatment adopt anoxia oxic A/O biological contact oxidation process, so the biochemical tank divide into A grade tank and O grade tank two parts.

The sewage in equalize tank will lift to A grade biochemical tank, to go ahead biological treatment. In A grade biochemical tank , due to the sewage organism content is high, microorganism in anaerobic condition, now the microorganism is facultative , they will transform the organic nitrogen into ammonia nitrogen, at the same time, using organic carbon source as electron donor, to make the NO₂-N,NO₃-N translate into N_2, and using part of carbon source and ammonia nitrogen synthesis new cellular material. so A grade tank with certain function of organic matter removal , relieve the organic load of follow-up O grade biochemical tank, to benefit to nitrification, and rely on high concentration organism in sewage , to finish denitrification, finally eliminate the nitrogen eutrophication pollution. By A grade tank biochemical action, the sewage still some organism and higher ammonia nitrogen, in order to make organism further aerobic degradation, at the same time, when carbonification tend to finish, nitrification can smoothly going on , thus set O grade biochemical tank.

The outlet water from A grade tank will flow into O grade tank, the O grade biochemical treatment rely on autotrophic bacteria finish, they utilize organism resolve generate inorganic carbon or carbon dioxide in air as nutrients source, to make the ammonia nitrogen translate into NO₂-N,NO₃-N. a part of O grade outlet water enter into settling tank to sediment, another part backflow to A grade to proceed A grade tank to proceed internal recycle, to realize nitrifying purpose. All equip with padding in A grade and O grade biochemical tank, the whole biochemical treatment process all rely on many kinds of microorganism to finish.

The dissolved oxygen is control about 0.5mg/l in A grade tank, above 2.0mg/l in O grade tank, air water ratio 12:1; part of outlet water in O grade tank backflow to A grade tank, reflux ratio is 200%; part flow into vertical settling tank, to make solid liquid separation; the outlet water in settling tank after solid liquid separation, will be discharge out directly after disinfection. The settling sludge in settling tank will lift to sludge concentration tank by air lifting device, the concentrated sludge transport out as farming fertilizer.

     Sewage---- bar careen----- equalize tank-----A grade anaerobic tank----- O grade aerobic tank ------ cleaning water tank---- reuse

Process Description

1,Bar screen   1 pc

Main used to intercept big block floater in sewage, to guarantee follow-up processing structures normal operation and effective reduce load, supply guarantee for system long term normal operation, bar screen space is 5mm, size:500*300mm.

2, Equalize tank

Size: 2000x2000x2000mm, design water retention time 4h.

Due to each time water quality,volume is different, the peak flow rate of average flow rate 2~8 times, thus sewage treatment system steady operation, equalize water volume and homogenize water quality, build-in sewage pump and backflow measure, equip with aeration system to proceed pre-aeration, to guarantee certain rated flow rate lifting to integrated sewage treatment equipments and follow-up treatment steady, sewage lifting pump 2pcs .

3. Package sewage treatment plants

This technical process adopt integrated sewage treatment plants, such plants mainly aiming at domestic sewage and industrial organic sewage, mainly adopt the mature bio-chemical treatment contact oxidation manner, total composed of the following 6 parts:

(1)A grade anaerobic tank

 In order to control the dissolved oxygen in A grade biochemical tank about 0.5mg/l, adopting interval aeration. The padding in A grade biochemical tank adopting new type elastic padding, height is 2.0m. such padding with the advantage of no easy blocking,light weight,big specific surface area, treatment effect steady etc, easy to maintenance and change , retention time 3.5hours.

(2)O grade aerobic tank

The O grade biochemical tank equip with columnar biology carrier padding, this padding specific surface area is big, is 16-20 times comparing with common biological padding, keep higher biomass, to reach the purpose of removing organic pollutant, aeration device adopting air blower and micropore aerator, the oxygen utilization rate is above 30, effective save operation cost. Retention time 7 hours, air water ratio about 12:1.

 (3)Secondary Settling tank

   The sewage still contain large number of suspended solid after treated by O grade biochemical, in order to make the effluent water SS meet up discharge standard, adopting vertical settling tank to make solid liquid separation, 1 set , surface load 1.0m³/m²·hr. the settling tank sludge adopt air lifting device lift to sludge tank, at the same time, according to actual condition to make part of sludge lifting to A grade biochemical tank to proceed sludge backflow, increase the sludge concentration in O grade, improve removal efficiency.

(4)cleaning tank

Used to storage cleaning water after treatment.

(5)Sludge tank

The supernate backflow toO grade biochemical tank to further treatment, few sludge after digestion. clearing manner can sucking and transport out from sludge tank bottom using dung-cart.

(6)Air blower room

Air blower set in the air blower room, equip with silencer.