Decanter centrifuge | Sludge dehydrator | Centrifugal dehydrator | mud dehydrator | Jinhua horizontal screw centrifuge | Complete set of sludge dewatering equipment

Flocculant operation details determine sewage treatment

2021-05-28 11:22:03

What type of polyacrylamide does the polyacrylamide used for sludge dewatering belong to?

The additives used in sludge dewatering are mainly sludge dehydrating agent polyacrylamide. At this time, the function of polyacrylamide is mainly to neutralize the negative charge in the sludge colloidal particles by using the positive charge attached to its molecular chain, accelerate the coagulation of sludge, and wrap the sludge particles together by using its molecular weight to squeeze out the water, so as to achieve the purpose of sludge dehydration. This is the working principle of polyacrylamide as sludge dehydrating agent.

The polyacrylamide used in sludge dewatering is mainly cationic polyacrylamide. Therefore, cationic polyacrylamide is also called special polyacrylamide for sludge dewatering. Anionic polyacrylamide is used in only a few cases.

For example, in the sewage treatment of urban sewage, papermaking, printing and dyeing, electroplating, ceramics and other industries, cationic polyacrylamide is mainly used for sludge dewatering in the sludge pressing link.

In the sewage treatment of ceramics, sand washing, beneficiation, coal washing and other industries, anionic polyacrylamide is mainly used for sludge dewatering in the sludge pressing link.

From the above application industries, we can see that cationic polyacrylamide is mainly used for sludge dewatering of organic wastewater, while anionic polyacrylamide is mainly used for sludge dewatering of inorganic wastewater industry. In order to select the right reagent and save the cost, it is recommended to test the water quality and select the reagent before purchasing polyacrylamide, so as to select the reagent model with ideal effect and low cost. The details of the use of polyacrylamide flocculant in sewage treatment often determine the treatment effect. In sewage treatment, the details of the use of polyacrylamide flocculant can be found, supplemented and corrected in time, so as to better dispose and clean the wastewater and reach the standard of environmental protection discharge.

Application of polyacrylamide flocculant

1. Pay attention to the tap water used to dissolve polyacrylamide. If it contains too many impurities, it will affect the effect of wastewater treatment. Generally speaking, the tap water used to dissolve polyacrylamide is clean. If unclean tap water is used, it will have chemical reaction in the dissolution process. It has a direct impact on the subsequent purification of wastewater. When the wastewater treatment plant stops this step, it needs to check the quality of dissolved water.

2. Under normal conditions, before wastewater treatment, when dissolving polyacrylamide, it should be stopped at 25 ℃ at normal temperature. If the temperature transition of dissolving polyacrylamide is too high to exceed 50 ℃, the flocculation effect of polyacrylamide will be reduced. As the temperature rises from time to time, the greater the falling level, so that it will show failure.

3. Be careful not to use iron utensils when storing and preparing polyacrylamide solution! Experiments show that when a small amount of iron powder or ferrites are added to the polyacrylamide solution, the flocculation performance and viscosity of the solution will be significantly reduced. Therefore, when storing and preparing polyacrylamide solution, it is necessary to select containers coated with resin carbon steel or plastic, stainless steel and other containers to prevent poor wastewater treatment efficiency.

4. The condition of wastewater treatment is related to the concentration of polyacrylamide solution. Different kinds of industrial wastewater require different concentrations of polyacrylamide solution. In order to ensure the efficiency of wastewater treatment, the manufacturer needs to configure chemicals strictly according to the practical situation to ensure the smooth play of the effect.

In addition, the concentration of polyacrylamide solution will be affected by storage time. Under normal conditions, the concentration of polyacrylamide solution is positively correlated with storage time. If the polyacrylamide solution with low concentration is configured, but it has been stored for a long time, it may be ineffective when it is used to treat wastewater. Therefore, pay attention to the storage time after solution configuration and try to follow the ready to use criterion! According to the practical situation of the wastewater plant, check the leakage and make up the deficiency, improve the water purification process and treat the wastewater more carefully.

Operational problems

Sludge dewatering polyacrylamide solution is best prepared and used now to prevent it from being placed for too long, so as not to affect the treatment effect.

When the container is cleaned, it should be cleaned in all aspects, so as to remove the impurities stuck on the wall of the drum and give the drum a balanced speed.

For the problem of water pressure, sometimes due to insufficient water supply pressure, the dissolution funnel of the material feeder cannot send polyacrylamide agent into the preparation pool, resulting in blockage. The solution is to increase the pump to improve the water pressure.

During water purification, the concentration of sewage sludge is relatively high. At this time, it is best to let the sewage stand for a period of time, and then extract the clean solution above to improve the sludge concentration for treatment.

Adjust the operation frequency of the dehydrator regularly. When the dehydrator vibrates violently, it should immediately prohibit re feeding, and dredge it first for the next step.

For those who have little contact with sludge dewatering, they may feel that as long as the product model is selected correctly, the effect of direct dissolution and dosing will be displayed soon, but this is not the case. Often, the factors affecting the effect may appear in a detail in the operation process, so attention should be paid to the operation and use.