Anfeng environmental protection according to the sewage pollutants are categorized, can be divided into suspended solid pollutants, organic pollutants, toxic substances, polluting organisms, etc., these substances, if discharged into the water body, will make the water body serious deterioration caused by water quality pollution. Therefore, the process of sewage treatment is very complex, Anfeng environmental protection for the process technology in sewage treatment, a few points.
The process technology of sewage treatment
The current popular sewage treatment processes are: AB method, SBR method, oxidation ditch method, ordinary aeration method, membrane separator, etc., each with its own characteristics.
AB method
The process of aeration tank according to the high and low load is divided into two levels of oxygen supply. a high load, aeration time is short, producing a large amount of sludge, sludge load of 2.5kgBOD / (kgMLSS? d) or more, the pool volume load of 6kgBOD / (m3? d) or more; B load is low, the age of the sludge is longer. a level and B level can also be constructed in phases, the A-level and B-level intermediate sedimentation. A level and B level can also be built in phases, A level and B level set up between the intermediate sedimentation tank. The F/M (ratio of pollutant quantity to microorganism quantity) of the two levels of pools are different, forming different microorganism groups.AB method is not suitable for low concentration of water quality despite the advantages of energy saving.
SBR method
This method of water intake, aeration, precipitation, water in the same pool to complete, often by 3-4 pools constitute a group, rotating operation, a pool of pools to run intermittently, so it is known as sequential batch activated sludge method. This process is characterized by a simple process, because there is only - a reaction tank, do not need a secondary sedimentation tank, reflux sludge and related equipment, generally do not set up a regulating tank, in most cases can be omitted in the primary sedimentation tank, so it saves the area and investment, shock load and flexible operation, can be arranged from time to time, aeration, anoxia and anaerobic Different states, to achieve the purpose of phosphorus denitrification.
Ordinary aeration method
The variant process of ordinary aeration method appeared the earliest, and its actual treatment effect is good, can deal with large amounts of sewage, for Jc-r plant can be centralized construction of sludge digestion tanks, biogas can be produced for energy use. The shortcomings of the traditional Pu aeration method is only as a conventional secondary treatment, does not have the function of nitrogen and phosphorus removal. In recent years, in engineering practice, by reducing the volume load of ordinary aeration tank, can achieve the purpose of nitrogen removal; set anaerobic zone in front of the ordinary aeration tank, can remove phosphorus, can also be used to remove phosphorus by chemical method. The use of ordinary aeration method to remove BOD, there are many forms of pool type, such as oxidation ditch, engineering known as ordinary aeration method of variant processes, can also be collectively referred to as ordinary aeration method.
Oxidation ditch method
It was developed in the early 1950s and formed, because of its simple structure, easy to manage, and soon popularized the application, and continuous innovation. At present, the oxidation ditch in the application of the development of a variety of forms, more representative of: Pa type, referred to as a single ditch type, surface aeration using rotary brush aeration, the depth of water is generally in the 2.5-3.5 m. Ao type, referred to as concentric circles, the actual application of more than oval three-ring road composition, three ring road using different DO, such as the outer ring of 0, the middle ring of 1, the inner ring of 2, this is conducive to the removal of nitrogen and phosphorus, the oxidation ditch method. This is conducive to the removal of nitrogen and phosphorus. The use of rotating disk aeration, water depth is generally in 4.0-4.5 m. Card type, referred to as circular folding type, the use of inverted umbrella impeller aeration, water depth is generally in the 3.0 m, but the sludge is easy to deposit. Three ditch oxidation ditch (T-type oxidation ditch), the process consists of three pools, the middle for the aeration pool, the left and right two pools for the sedimentation pool and aeration pool. It is characterized by the use of rotary brush aeration, shallow water, large footprint, no anaerobic tanks, does not have the function of phosphorus removal mouth J.
Membrane Separation Technology
Membrane separation instead of sedimentation for mud-water separation can bring about the following changes in the activated sludge process: no longer exists the problem of sludge expansion. When regulating the activated sludge system, it is no longer necessary to consider the settling performance of sludge, thus greatly simplifying the process control; the sludge concentration of the aeration tank will be greatly increased, MLSS can be greater than 20g / L, so that the system can be operated in the oversized mud age, ultra-low load condition, to fully satisfy the needs of removing a variety of pollutants; in the same treatment requirements, the aeration tank can be greatly reduced in size to save the treatment plant The increase of sludge concentration requires higher aeration rate, thus oxygen aeration will be used in large quantities with the separation of membrane.
Suzhou sewage treatment of environmental protection companies are more, Anfeng environmental protection in the sewage treatment qualification has an absolute advantage. Sewage treatment process is complex, the qualification requirements for environmental protection companies are relatively high. Sewage treatment is more complex than the wastewater treatment process in the enterprise. If you have a related sewage treatment problem, welcome to call and consult.