Pig Farm Sewage Treatment Equipment Physical Treatment Method
The waste water treatment method for separating and recovering undissolved suspended pollutants (including oil film and oil beads) in the waste water by physical action can be classified into a gravity separation method, a centrifugal separation method, and a sieve filtration retention method. The processing method based on the principle of heat exchange is also a physical processing method.
Chemical treatment:
A chemical treatment and mass transfer to separate and remove waste water from dissolved or colloidal conditions in wastewater or convert it into harmless substances. In the chemical treatment method, the processing units based on the chemical reaction generated by the dosing agent are: coagulation, neutralization, redox, etc.; and the mass transfer-based treatment units are: extraction, stripping, stripping , adsorption, ion exchange, electrodialysis and reverse osmosis. The latter two processing units are also collectively referred to as membrane separation techniques. The processing unit using mass transfer has both chemical and physical effects, so it can be separated from the chemical treatment method and become another processing method called physical chemistry. Domestic sewage treatment
Biological treatment:
Through the metabolism of microorganisms, the wastewater, which is a solution, a colloid, and a micro-suspended organic pollutant, is converted into a stable and harmless substance wastewater treatment method. According to the different microorganisms, the biological treatment method can be divided into two types: aerobic biological treatment and anaerobic biological treatment. Aerobic biological treatment is widely used in biological treatment of wastewater. According to the tradition, aerobic biological treatment is divided into two types: activated sludge method and biofilm method. The activated sludge process itself is a processing unit that operates in a variety of ways. The processing equipment belonging to the biofilm method includes a biological filter, a biological turntable, a biological contact oxidation tank, and a biological fluidized bed. The biological oxidation pond method is also called the natural biological treatment method. The anaerobic biological treatment method, also known as the biological reduction treatment method, is mainly used for treating high-concentration organic wastewater and sludge. The processing equipment used is mainly the digester.
Biological contact oxidation method:
The wastewater is treated by the biological contact oxidation method, that is, the biological reaction tank is filled with the filler by the biological contact oxidation process, and the oxygenated sewage is immersed in the entire filler and flows through the filler at a certain flow rate. The filler is covered with biofilm, and the sewage is in extensive contact with the biofilm. Under the action of microbial metabolism on the biofilm, the organic pollutants in the sewage are removed and the sewage is purified. After that, the treated wastewater is discharged into the biological contact oxidation treatment system and mixed with domestic sewage for treatment, and discharged after chlorine disinfection. The biological contact oxidation method is a biofilm process between the activated sludge process and the biological filter, which is characterized in that a filler is arranged in the pool, the bottom aeration of the pool is used to oxygenate the sewage, and the sewage in the pool is in a flow. The state is to ensure that the sewage is fully contacted with the filler immersed in the sewage, and the defect of uneven contact between the sewage and the filler in the biological contact oxidation pond is avoided, and the aeration device is called blast aeration.
Farm sewage treatment equipment treatment methods:
Aerobic treatment refers to a process in which aquaculture microorganisms are used to treat aquaculture wastewater. Aerobic biological treatment can be divided into two categories: natural aerobic treatment and artificial aerobic treatment.
The natural aerobic biological treatment method is a method for purifying wastewater by using natural water and microorganisms in the soil, and is also called a natural biological treatment method, mainly including water purification and soil purification. The former mainly includes oxidation ponds (aerobic ponds, facultative ponds, anaerobic ponds) and aquaculture ponds; the latter mainly includes land treatment (slow percolation, rapid filtration, ground flow) and constructed wetlands. The natural biological treatment method not only has low capital cost and low power consumption, but also has higher removal rate of organic matter, nitrogen and phosphorus and other nutrients and bacteria which are difficult to biodegrade, and the third-stage treatment effect can be achieved. In addition, under certain conditions, the method can be used in conjunction with sewage irrigation to realize the utilization of sewage resources. The shortcomings of this method are mainly that the floor space is large and the treatment effect is susceptible to seasonal influences. However, if the farm is small in size and there are abandoned ponds and shoals nearby, the method should be chosen to save investment and disposal costs.
Artificial aerobic biological treatment is a wastewater treatment method that adopts artificially enhanced oxygen supply to enhance the aerobic microbial activity. The method mainly includes activated sludge method, biological filter, biological turntable, biological contact oxidation method, sequencing batch activated sludge method (SBR), anaerobic/aerobic (A/O) and oxidation ditch method. In terms of treatment effect, the treatment effect of the contact oxidation method and the biological turntable is better than that of the activated sludge method. Although the treatment effect of the biological filter is also good, the filter clogging phenomenon is apt to occur. Oxidation ditch, SBR and A/O processes are all examples of improved activated sludge processes. Oxidation ditch effluent water quality is good, the amount of mud is small, and the sewage can be denitrified, but the BOD load is small, the floor space is large, and the operating cost is high. The SBR method has a high degree of automation and can carry out advanced treatment of sewage, but its disadvantage is that the BOD load is small and the one-time investment is also large. The A/O body is an activated sludge treatment process that has the dual functions of removing BOD and denitrification. Although the investment is large, the water treated by the method is easy to discharge. Therefore, for those farms with large scale, large amount of wastewater and strong economic capacity, the A/O method can be selected, and for medium-sized farms, aerobic treatment processes such as contact oxidation and biological turntable can be selected.