Sludge dewatering agent is an auxiliary agent used to treat sludge dewatering. In sewage treatment plants, the treated sludge contains very high moisture, and if it is not dehydrated, its moisture content will be extremely high, even close to liquid. Such sludge can not be directly used as resources, and it is not easy to transport and treat. Therefore, it is very important to dehydrate the sludge.
So, how is the sludge dehydrant to achieve this magical function? The principle is not complicated. Sludge dewatering agent is mainly through changing the internal structure of sludge, so that its drainage performance can be improved. In other words, it allows water to be quickly removed from the sludge, making it drier.
The selection of sludge dehydrating agent is the key problem which affects the dewatering effect of sludge. The type of sludge dewatering agent is different, so its dewatering effect will also be very different. Sludge dehydrating agent is a kind of chemical agent which can change the surface structure of sludge, reduce the solid surface load of sludge, reduce the specific surface area of sludge and destroy the structure of bacteria.
The functional groups on the polymer molecular chain can chemically react with the surface of the particles in the sludge, thus changing the surface electrical properties. This change makes the interaction force between sludge particles change, and the drainage performance is improved. At the same time, the polymer can also improve the bonding of particles inside the sludge, making it easier to drain.
They can change the physical state and water distribution of the sludge through adsorption and chemical reactions, so that it can be drained faster. The effect of these inorganic substances is actually through the interaction of surface active groups with the water in the sludge structure, making it easier for the water to be removed from the sludge. This mechanism is different from the polymer, but it also has the effect of draining water.
Sludge dewatering agent can effectively eliminate odor, bacteria and other harmful substances. After deep dehydration, the sludge forms a dry and hard mud cake with very low moisture content, and harmful substances flow out with the water, and the mud cake is non-sticky, the surface is dry, and no longer has odor, which can stabilize the sludge. Low moisture content mud cake is easier to use as resources.
Plate and frame filter press, diaphragm filter press, van filter press and other equipment can not reach the standard after processing, but also need to use drying equipment to dry, or the mud cake after several days of drying to reach the standard, not only waste resources, time, but also contrary to the original intention of environmental protection. According to the relevant regulations of the state, the sludge moisture content can reach 60% or less to landfill; The sludge forms a hard block before it can be mixed with other substances and sent to the decomposition furnace for combustion, and the moisture content of the sludge in this state is about 50%. The sludge cake tempered by sludge dehydrating agent can directly meet the standard of sludge resource disposal after being pressed by filter press.
In general, the principle of sludge dehydrating agent is to make it easier to drain by changing the structure and properties of the sludge. Polymers and inorganic substances as common sludge dehydrating agents, through chemical reaction or physical adsorption, to achieve the rapid removal of water from the sludge goal. Through the use of sludge dehydrating agent, not only can improve the dryness of sludge, but also achieve economic and environmental protection effects. I hope that through today's disclosure, we have a deeper understanding of sludge dehydrating agent!