Basic concepts of sewage treatment

It can be seen that the role of the sewage treatment process is only through biodegradation and conversion and solid-liquid separation, while purifying the sewage, the pollutants are enriched into the sludge, including the primary sludge generated by the primary treatment section, the residual activated sludge generated by the secondary treatment section and the chemical sludge generated by the tertiary treatment.

Because these sludge contains a lot of organic matter and pathogens, and is very easy to rot and stink, it is easy to cause secondary pollution, and the task of eliminating pollution has not been completed. Sludge must be properly disposed of through certain capacity reduction, reduction and stabilization harmless treatment Wells. The success of sludge treatment and disposal has an important impact on sewage plants and must be paid attention to. If the sludge is not treated, the sludge will have to be discharged with the treated effluent, and the purification effect of the sewage plant will be offset. Therefore, in the actual application process, the sludge treatment in the sewage treatment process is also quite critical. General water treatment methods and principles

Common water treatment methods are:

(A) sediment filtration method,

(2) Hard water softening method,

(3) activated carbon adsorption method,

(4) Deion method,

(5) Reverse osmosis method,

(6) ultrafiltration method,

(7) distillation method,

(8) ultraviolet disinfection methods, etc., now the principle and function of these treatment methods are explained here.

The purpose of sediment filtration is to remove suspended particulate matter or colloidal matter from the water source.

These particulate matter, if not removed, can cause damage to other sophisticated filtration membranes used in dialysis water or even block waterways. This is the oldest and simplest water purification method, so this step is commonly used in the preliminary treatment of water purification, or if necessary, several more filters will be added to the pipeline to remove larger impurities.

There are many types of filters used to filter suspended particulate matter, such as mesh filters, sand filters (such as quartz sand, etc.) or membrane filters. As long as the particle size is larger than the size of these holes, it will be blocked down. For ions dissolved in water, there's no stopping them. If the filter is not replaced or cleaned for too long, more and more particulate matter will accumulate on the filter, and the water flow and pressure will gradually decrease. People use the difference between the inlet water pressure and the outlet water pressure to determine the degree of blockage of the filter.