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Complete sets of equipment for food and sewage
First, an overview
1, engineering survey
Food factory's total discharge of sewage treatment, by lime precipitation and air floatation and hydrolytic acidification +AO biochemical process in the treatment of process, again after the secondary precipitation to the farmland irrigation water quality standard "gb5084-92 rainfed irrigation standard after discharge.
Domestic sewage treatment project main civil, equipment installation, equipment, automatic control functions, the use of PLC independent work, the normal work for the full automatic control, when necessary, can be switched to manual control.
2, design principles
A, using lime sedimentation + air flotation + hydrolysis acidification +AO wastewater treatment process, to ensure that the treatment of the indicators of the effluent to meet the discharge requirements.
B, sewage treatment station sewage as a food factory integrated drainage, the need for the discharge of sewage to be pretreated, and to reach the sewage treatment station after the water requirements, in order to be incorporated into the sewage treatment system.
C, sewage treatment station is convenient for operation and management, equipment maintenance, while reducing the impact on the surrounding environment.
D, sewage treatment facilities in operation with greater flexibility and adjustability, to meet the water quality, water content, and tries to sewage treatment station covers an area of small, project investment, energy consumption low processing cost less.
E, the design fully consider the prevention and control of the secondary pollution of the sewage treatment station,, for equipment deodorization, vibration and noise reduction, a corresponding measures, sewage treatment produced in the process of the small amount of residual sludge after aerobic digestion process regularly by outsourcing unit cleaning Sinotrans, so as to avoid causing secondary pollution to the environment.
F, sewage treatment system with emergency bypass and dual power supply and other protective measures.
G, sewage treatment power equipment and other ancillary equipment are the use of domestic well-known manufacturers of products, to ensure stable operation, reliable, reliable.
Two, sewage water quality, water quantity and discharge standards
1, the design of water
According to the owners to provide information on the design of water.
2, the design of water quality (past experience)
CODcr: = 3000mg / L
BOD5: = 1500mg / L
PH:6~9
SS: = 500mg / L
N: = 150mg / L
3, discharge standard
Dry farming irrigation standards by the station after the treatment of effluent from sewage treatment must meet the "standard" irrigation water quality GB5084-92
Project | Urban miscellaneous water quality |
CODc r(mg/l) | ≤300 |
BOD5 (mg/l) | ≤150 |
S S(mg/l) | ≤200 |
ammonia nitrogen(mg/l) | ≤30 |
PH | 5.5~8.5 |
Three, processing process
1, according to the above design principles and design water quality, water quantity and discharge standards, this project considers the use of lime sedimentation + air flotation + hydrolysis acidification +AO+ two heavy, the treatment process is as follows:
Process flow chart:
Fig. 1 block diagram of process flow
2, the main role of each unit in the sewage treatment process:
(1) pool:
Collect wastewater, balance water quality.
(2) lime adding reaction tank:
Since the design of the wastewater from the original anaerobic pond effluent, the waste water into acid pickling, the role of lime milk is to regulate the pH value of water, and the initial degradation of ammonia nitrogen.
(3) air floatation machine:
By adding flocculant and coagulant aid to make the suspended matter in the water flocculation, and then through the air flotation machine to remove suspended solids.
(4) hydrolysis acidification tank
Degradation of large molecular substances into biodegradable substances, improve the biodegradability of wastewater, in order to facilitate the subsequent biological treatment.
(5) anoxic tank
The main role of denitrification in the removal of nitrate nitrogen, while the removal of part of the BOD.
(6) aerobic pool
Using biological contact oxidation pool, pool of dissolved oxygen and excellent biological bacteria and organic pollutants contact reaction, for organic pollutants in the oxidation of ammonia and phosphorus absorption and removal of creating the best adapted to their environment and improve the organic pollutants and ammonia nitrogen and phosphorus removal efficiency.
(6) two sinks
Secondary sedimentation tank is mainly meet the contact reaction tank with water outflow sloughed biofilm, free zoogloea, organic impurities of the settlement, in order to achieve satisfactory effect of sedimentation by reasonable design of surface load, settling velocity, the sludge bucket angle, to avoid dead ends, shorten the sludge residence time in the pool, guarantee clarification effect and mud water separation effect.
(7) concentrated pool:
Aerobic digestion and stable treatment of the sludge in the tank after biochemical sedimentation to reduce the sludge volume and improve the stability of the sludge. Less sludge aerobic digestion, regular contact discharge into the tank for treatment of dry sludge dewatering sinotrans. The supernatant was returned to the regulation pool.
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