What Is a Concentration Cell?

Concentration tank, sewage treatment concept, also known as sludge concentration tank. Generally adopt the shape like vertical flow or radial flow. It can be divided into batch operation and continuous operation. The former is mainly used in small sewage treatment plants or sewage treatment plants of industrial enterprises, while the latter is used in large and medium sewage treatment plants. The form of continuous gravity concentration tank is the same as that of radial sedimentation tank. It can be divided into three types: mud scraper and sludge stirring device, without mud scraper, and multilayer thickening tank.

Concentration tank, sewage treatment concept, also known as sludge concentration tank. Generally adopt the shape like vertical flow or radial flow. It can be divided into batch operation and continuous operation. The former is mainly used in small sewage treatment plants or sewage treatment plants of industrial enterprises, while the latter is used in large and medium sewage treatment plants. The form of continuous gravity concentration tank is the same as that of radial sedimentation tank. It can be divided into three types: mud scraper and sludge stirring device, without mud scraper, and multilayer thickening tank.

The control of the sludge concentration tank includes the control of the amount of sludge input and the control of the amount of discharged concentrated sludge. Generally, there is no sludge storage tank before the concentration tank. In this way, the sludge discharged from the sewage treatment system directly enters the concentration tank. Therefore, the control of the concentration tank mainly refers to the control of the discharge of concentrated sludge. The main control methods of concentrated sludge discharge are:

(1) Control the start and stop of the mud pump with a timer;

(2) Use a timer and a preset counter to control the discharge of a certain amount of concentrated sludge every day;

(3) Use a timer to control the startup of the sludge pump, and stop the pump when the sludge concentration is reduced to a certain concentration using a sludge concentration meter;

(4) Use a timer to control the start of the pump, and use a sludge concentration meter, flow meter, and preset counter to stop the pump every time a certain amount of solids are discharged (based on dry sludge mass).

Large sewage treatment plants often adopt control methods (1). For semi-continuous operation control, the control method (2) is generally adopted for small sewage treatment. The control process (3) and (4) using the sludge concentration detector and the required hardware equipment are not complicated, but currently they are not widely used. ^[3]