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Complete sets of equipment for medical treatment
1, project overview
According to the basic information provided by the construction unit, combined with our company's relevant engineering experience, in accordance with the environmental requirements of the preparation of the program, for the owners and the environmental protection department reference and decision-making.
Hospital sewage collection and discharge of sewage treatment, the use of advanced AO biochemical + sand filtration treatment process, and then after disinfection to achieve GB8976-1996 "comprehensive sewage discharge standards" in the first discharge standard. Main indicators 100mg/L < BOD < 20mg/L < PH:6-9 < < SS < 70mg/L < COD >. The amount of processing to meet the 20m fand /H, 24 hours of continuous operation.
Hospital sewage treatment works mainly civil, 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
(1) the design of the project to ensure that the water to meet the requirements of the premise, as far as possible to save investment, give full play to the social benefits, economic benefits and environmental benefits of sewage treatment works.
(2) the technological process used is suitable for the treatment of low concentration organic wastewater. With rationality and advanced, to ensure that the operation management is simple and flexible, as far as possible the use of the latest energy-saving technologies and equipment, reduce the cost of sewage treatment station, reduce operating costs.
(3) design and choose appropriate automation operation, improve the operation and management level of sewage treatment station.
(4) the sewage treatment station layout to the layout and planning area of land arrangement.
(5) to prevent sludge Sinotrans work, two pollution.
3, design water quantity, water quality and treatment degree
According to the water quality and quantity data provided by the construction unit, the source of the waste water is the source of the waste water.
1 design water
According to the information provided by the construction unit, combined with the treatment experience of our hospital sewage, this project uses the "AO+ sand filter" method.
Design and treatment of the amount of 400m3/d, 20m3/h
2 influent water quality index
Wastewater comprehensive water quality indicators are as follows:
Table 2-1 wastewater quality index
category | COD | BOD | SS | ammonia nitrogen | Animal and vegetable oils | pH |
index | ≤400 | ≤205 | ≤100 | ≤30 | ≤10 | 6～9 |
Note: 1.pH dimensionless; 2 other units are mg/L.
3 water quality indicators
Table 2-2 effluent water quality index
category | CODcr | BOD5 | SS | Animal and vegetable oils | ammonia nitrogen | pH |
index | ≤100 | ≤20 | ≤70 | 10 | ≤10 | 6～9 |
The total effluent index of the sewage treatment station reaches the first class discharge standard of the comprehensive wastewater discharge standard of the city GB8976-1996.
5 sewage water quality analysis
Hospital wastewater, B/C is greater than 0.35, can be a good biochemical, and there is no interference with the physiological activities of microorganisms, biological treatment process can be used to eliminate pollutants in water.
This project sewage inflow uneven degree is high, water quality, water changes larger, because the water volume and water quality has great inhomogeneity. Therefore, it is necessary to consider the establishment of the homogeneous rate adjustment in the pool.
Process selection:
According to the above import and export water quantity and water quality, we consider the choice of sewage treatment technology in accordance with the following ideas:
A, due to the hospital sewage can be a good biochemical, so the use of AO biological treatment of the project has a great advantage of sewage. Biological process in wastewater treatment, with distinct characteristics: 1) good effluent quality, due to the use of biological hangs the membrane technology, with high quality and safety; 2) covers an area of small, microorganisms in the bioreactor to maintain a high concentration, volume load is greatly improved, thereby greatly reducing the residence time of the units concerned, reducing the area and it is stable in operation, the operation is simple and can achieve a high degree of automation; 4) to save the operation cost;
B, first into the septic tank, the purpose of which is to initially reduce the inorganic particulate matter content and improve the identity of a sewage; to remove large particles in water organic pollutants and suspended matter. Septic tank effluent through the grille interception, the sewage pretreatment, into the regulation pool, sewage in the regulation pool in homogeneous amount at the entrance to the subsequent biochemical treatment unit. Regulation pool in sewage is first pumped into the anaerobic pool, in under the action of anaerobic microorganisms, most of the organic matter is decomposed; anaerobic pond water flowing into the aerobic biological reaction tank, through the role of microorganisms in the pool further degradation in water organic matter. Through the degradation of biofilm and the sedimentation of the two settling tank, the effluent can reach the standard after the filtration of the sand filter tank.
The biochemical system of sludge and other impurities into the sludge pool, regular sinotrans.
4, wastewater treatment process design
1 wastewater treatment process
2 wastewater treatment process instructions
(1) the main function of the grid is to intercept the large waste water in the waste water, and prevent the normal operation of the subsequent equipment.
(2) the effluent of the regulating tank is pumped into the subsequent anaerobic and aerobic biochemical treatment unit through the pump, and the degradation and separation of the pollutant in the unit is carried out. Two after the sewage sludge is separated, the water is filtered through the sand filtration to remove the suspended matter, and then the chlorine dioxide solution generated by the chlorine dioxide generator in the disinfection pool kills the bacteria and then discharges the standard.
(3) the sludge is discharged to the sludge tank. The sludge pool after the sludge concentration and regular sinotrans.
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