Shale shaker and decanter centrifuge for water treatment

The sewage treatment plant will reuse or discharge the sewage sent through the necessary treatment means to meet the national water quality control standards. From the perspective of sewage treatment, pollutants can be divided into suspended solid particles, organic pollutants, toxic substances, polluted organisms and polluted nutrients.

Treatment methods can be divided into physical treatment methods, biological treatment methods, sludge disposal and chemical treatment methods generated from sewage treatment according to the type of water quality. The physical treatment method is a method for separating and removing pollutants in sewage by using physical action. Common methods are sieve retention, gravity separation, centrifugation and so on. The decanter centrifuge plays an important role in the processing equipment of centrifugal separation.

Sludge dewatering is the main obstacle to river dredging projects. Equipped with a Shale Shaker, a sand remover, and a desilting dredging system, which can remove sludge above 25 microns, but fine particles below 25 microns cannot be processed. At this time, a centrifuge is needed. The GN Solids Control centrifuge can separate fine particles above 5 microns without adding polymers and relying only on mechanical separation. Through the addition of drug flocculation technology, the centrifuge and Dewatering unit can be used together to achieve zero emissions.

Sewage is pretreated by processing equipment such as grids, sand settling tanks, sedimentation tanks, etc. At this time, fine solid particles still exist in the sewage. The decanter centrifuge can use the quality difference between the fine particles (minimum 2-5 microns can be separated) and the liquid to mechanically complete the problems that the previous processing equipment cannot handle. GN Solids Control decanter centrifuge adopts centrifugal cast two-way stainless steel 2304 or 2205. The internal pusher adopts tungsten carbide alloy sheet inlaid protection for more durable and durable, these features provide protection to improve the life of the centrifuge.

What difference speed (pushing speed) can be used for sewage treatment?

1) First, the high differential speed (pushing speed) completely mixes liquid and solids; the entire mud centrifuge will work like a mixing mixer instead of an effective solid-liquid separation device.

2) Secondly, chemicals are usually added to the separated wastewater. High differential speed (pushing speed) will cause some medicine to be lost in the liquid outlet.

3) In addition, if chemicals are added to the wastewater before entering the centrifuge, it will generate foam in the centrifuge.

Therefore, if your centrifuge has experienced the above problems, you may need to consider reducing the differential speed (feed speed).

After the decanter centrifuge processes the sewage, it will then pass through activated sludge treatment system and tertiary treatment of biological denitrification and phosphorus removal, coagulation sedimentation filtration, activated carbon adsorption, etc., and finally become reclaimed water, which is usually called water.

If you have related requirements, please feel free to contact GN Solids Control.

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