Environmental protection water treatment

 the process principle of the security filter?

Is the use of 5um pore pp filter for mechanical filtration, so that the remaining trace suspended particles in the water, colloidal microorganisms, etc., are trapped or adsorb on the surface of the filter and the gap. With the increase of water production time, the filter element solid intercept makes its resistance rise, when the inlet and outlet pressure difference increases to 0.1MPa, it should be replaced; The filter element of the filter is a replaceable cassette filter rod.

 How to prevent scaling of RO film?

1) Do a good job of raw water pretreatment to ensure that SOI<4, while adding fungicides to prevent the breeding of microorganisms;

2) In the RO operation to maintain the appropriate working pressure, the general working pressure increases the water production also increases, but too much will make the film compacted.

3) During RO operation, the flocculation state of concentrated water should be maintained to reduce the concentration polarization of the solution on the membrane surface and avoid the precipitation of insoluble salt on the membrane surface;

4) When the RO is out of service, it should be dosed and washed in the short term, and CH2O protective liquid should be added for protection in the long term.

5) When the RO water is significantly reduced or the salt content is increased, the surface is scaled or polluted, and chemical cleaning should be carried out.

the role of NaHCO3 in the desalting process of RO device?

Eliminate or reduce the residual chlorine content in water to ensure the stability of RO components, our company's residual chlorine is less than 0.1mg/L.

What is the role of the electric slow-opening automatic valve set before the RO membrane assembly?

Prevent the sudden start and stop of the high pressure pump when the RO is running, resulting in high pressure impact on the RO membrane elements, forming a water hammer to destroy the RO membrane.

 what is the filtration cycle? How many links does it involve? What is the role of each link?

Filter cycle is the actual running time between two backwashing, including: filtration, backwashing, and washing three links

Backwashing is to remove the accumulated dirt in the filtration process and restore the intercepting capacity of the filter mediu

Is positive washing guaranteed to run the filter? Water qualified is a necessary link, after the washing qualified to enter the cycle operation water.

activated carbon dechlorination principle

The removal of residual chlorine by activated carbon is not a physical adsorption, but a chemical reaction. When the free residual chlorine passes through the activated carbon, a catalytic effect is generated on its surface. The free residual chlorine is quickly hydrolyzed to oxygen atom (O) and chemically reacts with carbon atom to produce carbon dioxide, while the HCLO in the raw water is quickly converted into CO2 gas.

Comprehensive reaction:

C+2Cl2+2H2O→4HCl+CO2↑

According to the above reaction vessel, the activated carbon will be gradually reduced according to the amount of residual chlorine content in the raw water, and should be appropriately supplemented every year.

reverse osmosis process principle

RO is to remove most of the salt in the water by using the water permeable properties of the semi-permeable film. The raw water side of RO is pressurized, so that part of the pure water in the raw water passes through the membrane in the direction perpendicular to the membrane, the salts and colloidal substances in the water are concentrated on the surface of the membrane, and the remaining part of the raw water takes away the concentrated substances in the direction parallel to the membrane. Through the water only a small amount of salt, collected through the water, that is, to achieve the purpose of desalination.