Wastewater biological treatment is a general term for biological treatment of wastewater. It is one of the most widely used methods in modern wastewater treatment applications. It mainly utilizes the decomposition of microorganisms to convert organics in wastewater into simple inorganic substances, and the wastewater is purified. According to the demand for oxygen, wastewater biological treatment can be divided into two categories: anaerobic biological treatment and aerobic biological treatment.

Anaerobic biological treatment uses anaerobic microorganisms to convert organic matter into organic acids. Methanogenic bacteria decompose organic acids into methane, carbon dioxide and hydrogen, such as anaerobic ponds, septic tanks, anaerobic digestion of anaerobic and anaerobic organisms. Reactors, etc. Aerobic biological treatment uses mechanical aeration or natural aeration (such as algae photosynthesis oxygen production) to provide active energy for aerobic microorganisms in wastewater, promote the decomposition of aerobic microorganisms, and purify wastewater, such as activated sludge, Biological filters, biological carousels, wastewater irrigation, oxidation ponds, etc.

Wastewater biological treatment effect is good, the cost is low, the technology is relatively simple, and the application is relatively simple. When simple precipitation and chemical treatments do not guarantee sufficient levels of purification, biological methods are used for further processing. In the biological treatment, special attention should be paid to the basic characteristics of the microorganisms that purify the wastewater, and meet the requirements. The main factors are: the ratio of BOD and COD in the wastewater should be greater than 0.3; there is a high temperature, and in general, the winter effect is poor.

In the course of chemical experiments, a lot of waste liquid waste water treatment often occurs, some of which are very harmful to the body. When we prove that the waste is already scarce and safe, we can discharge it into the atmosphere or in the drainage ditch; try to concentrate the waste liquid to make it smaller and store it in a safe place; use distillation, filtration, adsorption and other methods. The hazardous material is separated, but only the safe part is discarded; no matter liquid or solid, it can be burned if it can be safely burned, but the quantity should not be too large. Do not leave residual gas or residue in the combustion. If it cannot be burned, select it. The safe place is buried and it is not exposed on the ground.

Wastewater treatment Acidic waste liquids are generally treated using the neutralization method:

1 Neutralize acid waste and alkali waste to 6-9

2 adopts the method of medicine neutralization, the commonly used neutralizing agent is industrial soda, caustic soda, ammonia, calcium carbonate.




Angular contact ball bearing can withstand both radial load and axial load. Able to work at a high speed. With larger contact angle, the axial capacity of the bearing will be higher. High precision and high speed bearings usually have a 15 degree contact angle. The contact Angle will increase under axial force.

Angular contact ball bearing accuracy class includes dimensional tolerance and rotation precision.The precision is expressed as P0(ordinary), P6(P6X), P5, P4 and P2.In addition, the European and American brands also use P3, P7 and P9 to indicate the accuracy level. P3 is the P6 level of ISO and JIS standard, P7 is equivalent to P4, P9 is equivalent to P2.


Single row angular contact ball bearings application are:machine tool spindle, high frequency motor, gas turbine, centrifugal separator, small car front wheel, differential pinion shaft, booster pump, drilling platform, food machinery, dividing head, filling machine, low noise type cooling tower, electrical equipment, coating equipment, machine tool trough plate, arc welding machine.


angular contact

Double row angular contact ball bearing application are: oil pump, roots blower, air compressor, all kinds of transmission, fuel injection pump, printing machinery, planetary reducer, extraction equipment, cycloid reducer, food packaging machinery, electric welding machine, electric, square box, gravity type spray gun, wire stripping machine, axle shaft equipment, chemical machinery, testing analysis equipment.

double row angular

Angular Contact Ball Bearing sets:



Angular contact ball bearing most common series names are below:


718 Series

719 Series

H719 Series

70 Series

H70 Series 

B70 Series 

72 Series

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Angular Contact Ball Bearing

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August 30, 2019