160-bed hospital sewage treatment project

The main technical parameters:
1, model: WSZ-2 series
2. Handling capacity: 2m3/h, the project has a daily displacement of 40 cubic meters, designed according to 2 cubic meters per hour.

Working principle:

The removal of organic pollutants and ammonia nitrogen by the WSZ series of buried sewage treatment plants mainly depends on the AO biological treatment process in the equipment. The working principle is in Class A. Due to the high concentration of organic matter in the sewage, the microorganisms are in a gas-deficient state. At this time, the microorganisms are facultative microorganisms, which convert the organic nitrogen in the sewage into NH-N, and use organic matter as an electron donor. , converting NO-N.NO-N into N, and also using some organic carbon sources and NH-N to synthesize new cellular materials. Therefore, the A-stage pool not only has a certain organic matter removal function, but also reduces the organic load of the subsequent aerobic tank. In order to facilitate the progress of nitrification, and relying on the higher concentration of organic matter present in the raw water to complete the denitrification, and finally eliminate the eutrophication of nitrogen, the concentration of organic matter in the O grade has been greatly reduced, but there is still a certain amount Organic matter and high NH-N are present. In order to further oxidize and decompose the organic matter, and the digestion can proceed smoothly when the carbonization is completed, a good biological contact oxidation pool with a lower organic load is set in the O-stage, in the O-class pool. There are mainly aerobic microorganisms and self-oxidizing bacteria (nitrifying bacteria), in which aerobic microorganisms decompose organic matter into CO2 and H2O, and autotrophic bacteria (nitrifying bacteria) are produced by decomposition of organic matter. Carbon dioxide in the carbon or air is used as a source to convert NH-N in the sewage into NO-N.NO-N. The effluent portion of the O-stage pool is returned to the Class A pool to provide an electron acceptor for the Class A pool, which ultimately eliminates nitrogen contamination by denitrification. The filler is used in the pool, and the microorganisms adhere to the surface of the filler, which increases the area of the material. The biofilm is mainly composed of bacteria micelles, and the bacteria mice continuously react with the organic matter in the sewage, through the secondary aerobic treatment and the appropriate residence time. The COD in the water is greatly reduced.

The working principle of the chlorine dioxide generator: the sodium chlorate aqueous solution and the hydrochloric acid solution are accurately metered by the metering pump under the negative pressure inside the chlorine dioxide generator, and then enter the reaction kettle to fully react to produce chlorine dioxide as the main component. The disinfecting gas is absorbed by the ejector and mixed with water to form a disinfecting solution, and then added to the sterilized water.
For the hospital medical wastewater containing heavy metal ions such as mercury, multi-media filter, activated carbon filter filtration and adsorption treatment. In particular, the activated carbon adsorption filter utilizes the adsorption and filtration capacity of the activated carbon itself, and uses the activated carbon loaded with different properties to achieve the corresponding treatment target, thereby treating fine suspended matter and heavy metal ions in the wastewater. At the same time, the color and odor of the water are removed.

Process selection and removal rate description:
1, the choice of process:
There are many organic impurities in hospital sewage, CODcr and BOD5 are higher, and the value of BOD5/CODcr is more than 0.25, and the biochemical performance is better. Therefore, it is advisable to adopt a biochemical-based process. Because of the small amount of sewage water, biochemical equipment is more suitable for underground integrated sewage filtration treatment equipment.
2. According to the characteristics of sewage in similar hospitals, the data of sewage water quality is drawn as follows:

3. According to the first-level discharge standard in the Integrated Wastewater Discharge Standard (GB18466-2005), the sewage discharge standard data is as follows:

The sewage is removed by the grille and floated into the sewage regulating tank (required separately). The sewage in the regulating tank is lifted by the lift pump into the integrated sewage filtration treatment equipment. The sewage is hydrolyzed and acidified in the equipment, and biological contact oxidation is performed. Precipitation, clear water tank (disinfection), and then through the multi-media filter and activated carbon filter, etc., the effluent reaches the standard discharge. The sedimented sludge produced by the sedimentation tank in the integrated equipment is sent to the sludge tank in the integrated equipment by gas stripping. The sludge is concentrated and settled in the sludge tank and digested, and the supernatant is returned to the regulating tank together with the original wastewater. Reprocess. The concentrated sludge is regularly pumped out by the manure truck.

4. Benefit analysis
After the implementation of sewage treatment equipment, it will bring good social and environmental benefits, which can effectively reduce pollutant emissions from the project and the surrounding environment; it will help improve environmental quality, protect people's physical and mental health, and improve people's living standards and living environment. Obvious social benefits.
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