Dry goods | Water treatment knowledge, how many can you answer?

What are the main measures to reduce acid consumption?

(1) Ensure the quality of influent water;

(2) Guarantee the quality of regeneration and extend the cycle of water production;

(3) Ensure the quality and purity of the regeneration liquid, and strictly control the regeneration operation rules;

(4) Ensure the safe, reliable and normal operation of the equipment.

What is the purpose of using coagulant?

(1) Improve the floc structure to make the particles grow, strong and heavy;

(2) Adjust the PH value and alkalinity of the treated water to achieve the best coagulation conditions and improve the coagulation effect; the coagulant itself does not coagulate, but it can promote the coagulation process of impurities in the water.

The basic concept of coagulation:

Because the colloidal particles present in the water are negatively charged, they are mutually repulsive, and at the same time, they continue to do “Brownian motion” in the water, which is extremely stable and not easy to sink. When an appropriate amount of coagulant is added, the tiny colloidal particles in the water can be removed It is stable and produces adsorption bridging, flocculating into flocs and sinking rapidly. This process is called coagulation.

What are the main factors that affect the coagulation effect?

(1) PH of water: if PAC is hydrolyzed to produce Al (OH) 3 colloid, when PH is 6.5-7.5, the dissolution is minimum, and the coagulation effect is also good;

(2) The alkalinity of water: when the alkalinity is insufficient, the coagulant continuously produces H + during the hydrolysis process, which causes the PH value to decrease, and the coagulation effect also decreases;

(3) Water temperature: when the temperature is low, the viscosity of water is large, the hydrolysis rate is slow, the formation of flocs is slow, and the structure is loose, and the particles are small and not easy to settle;

(4) The composition of impurities in water: the nature and concentration have a great influence on the coagulation effect.