Method and principle of sewage treatment

(4) Adding chemical coagulant and activated carbon method. Adding chemical coagulant and activated carbon to the aeration tank of activated sludge process is equivalent to carrying out physical and chemical treatment at the same time of biochemical treatment. Activated carbon can also be used as a carrier of microorganisms and has the role of assisting solid settlement, the removal rate of BOD and COD is increased, and the water quality is purified.

(5) Biological contact oxidation method. This is a new sewage treatment method with the characteristics of activated sludge method and biological filtration method, which replaces the general aeration tank with contact oxidation tank and the common sedimentation tank with contact sedimentation tank.

(6) Pipeline aeration. This method is to aerate the activated sludge in the pressure pipeline and transport it over a longer distance. With less equipment, investment costs and operating costs can be reduced.

Aeration: that is, exhaust flow aeration, the use of aeration fans to continuously pump compressed air into the wastewater to ensure that there is a certain amount of dissolved oxygen in the water to maintain the life activities of microorganisms, decompose organic matter in the water, and achieve the purification effect of water treatment.

2, biofilm water treatment method

(1) Biological filter: The wastewater flows through the biofilm growing on the surface of the filter material, through the exchange of materials and biochemical effects between the two sides, so that the organic matter in the wastewater degradation, to achieve the purpose of water treatment purification.

(2) Biological turntable: composed of a number of closely spaced disks fixed on a horizontal axis, and a layer of biofilm is grown on the surface of the rotating disk to achieve the effect of water treatment and purification.

Biological contact oxidation: All the fillers for microbial colonization are immersed in the wastewater, and mechanical equipment is used to fill the air into the wastewater, so that the organic matter in the wastewater is degraded to purify the wastewater.

3, land treatment system (1) Land perfiltration: the use of microorganisms in the soil membrane and plant roots to purify pollutants for domestic sewage treatment, while the use of sewage water, fertilizer to promote the growth of crops, grass, trees.

(2) Sewage irrigation: The main purpose of this water treatment method is irrigation to make full use of the purified sewage.

4, anaerobic biological water treatment method: the use of anaerobic microorganisms to decompose organic matter in sewage to achieve the purpose of water treatment and purification, while producing methane gas, CO2 and other gases.

Ion exchange

Mixed bed is short for mixed ion exchange column, which is designed for ion exchange technology. The so-called mixed bed is to mix a certain proportion of positive and anion exchange resin into the same exchange device to exchange and remove ions in the fluid. Because the specific gravity of the Yang resin is larger than that of the Yin resin, the Yin resin is on the top of the Yang resin in the mixed bed. A prajna, Yin resin filling ratio of 1:2, there are also filling ratio of 1:1.5, can be considered according to different resin choices. Mixed bed is also divided into in vivo synchronous regeneration mixed bed and in vitro regeneration mixed bed. The synchronous regenerative mixed bed is carried out in the operation and the whole regeneration process in the mixed bed, and the resin does not move out of the equipment during regeneration, and the positive and negative resin are regenerated at the same time, so the auxiliary equipment is less and the operation is simple.

The equipment of mixed bed treatment process includes mixed ion exchanger and in vitro regeneration equipment. In vitro regeneration equipment mainly includes resin separator, Yin (Yang) resin regenerator, resin storage tower, hybrid resin tower and acid base regeneration equipment.

Equipment advantage

1. The effluent water quality is excellent, and the effluent pH value is close to neutral.

2, the effluent water quality is stable, and the change of short-term operating conditions (such as influent water quality or composition, running velocity, etc.) has little impact on the effluent water quality of the mixed bed.