Exposure is an important part of the operation of the biochemical system, the main effect of which is the forced introduction of air into sewage, the assurance of dissolved oxygen required for microbiological metabolism, and the disturbance of water bodies to prevent the sinking of the suspension. When sewage is treated biochemically, exposure is usually the most costly part of the operation, and exposure equipment has been upgraded, and today we are talking about the advantages and disadvantages of various devices。
The types of exposure equipment that are currently more applied are: micro-pores (disk and tube), currents, rotors (single nozzles and double nozzles), diffuses, and surface exposure。
Micro-pore-exposurers have the highest utilization of oxygen, with new products reaching more than 30 per cent of the 6-metre clean water. But it's impermeable and has a short lifespan. Micro-pore-exposurers can increase wind pressure and energy consumption after a certain period of time is spent as a result of mud-blocking, and the use of oxygen can be drastically reduced after damage, requiring timely replacement。
Ejectors are an early exposure process for industrial wastewater, with advantages such as large service areas that are not easily clogged. The oxygen utilization of the current in clean water of 6 metres is about 15-21 per cent. Fluid exposure requires circulation pumps, which are more energy-intensive. In calcium-containing wastewater, nozzles are prone to blockage。
Rotator is a new type of exposure process that has emerged in recent years and is tested in 6 m clean water using oxygen, about 18-23%. Large-scale applications in the field of industrial wastewater have been initiated in recent years because of uninterrupted production and installation, life expectancy of more than 10 years, lack of congestion, stable wind pressure and moderate energy consumption。
Diffusion exposure, umbrella shape, oxygen utilization of about 8-12 per cent. The rationale is that the air current crashes into the sawn teeth and cuts because it is weak, it is weak, it is weak, it is larger, it uses less oxygen and it is less and less used。
Table exposure, which applies to shallow oxidized ditches, with poor oxygenation during water depths, is decreasing with the intensity of the land and increasing water depths。
A list comparison is made for the three exposure processes with the most applied micro-pores, voltages and streams。
