The flocculation air flotation machine needs to be added with medicine during normal operation, and the sewage does not enter the air flotation tank after flocculation.

If the treatment process is physicochemical after sterilization, the dosage of PAC is about 0.1% (national standard, 10% effective content), and PAM is about 1-3ppm, that is, about 10 tons of PAC and 10-30kg of PAM are added per 10,000 tons of water. If the process is physicochemical first and then biochemical, the above dosage will be doubled. The actual dosage will vary according to the water quality and needs to be fine-tuned on site. PAC is polyaluminum chloride, PAM is polyacrylamide. The former is a flocculant, the latter It is usually used in combination. Generally, PAC is added first, and then PAM is added. Sometimes it may be necessary to add acid or alkali to adjust PH. The two are mainly used in coagulation sedimentation tanks, that is, physical and chemical treatment sections, and industrial wastewater treatment. Commonly used.

Dosing is an important link in the sewage treatment process. Whether the dosage is reasonable is the key to determining the quality of the treated water. Different water quality requires different dosages. The dosage of various drugs should be based on the composition of the incoming water. And the concentration is determined by small sample test. Generally speaking, the dosage of acid-base solution should be able to ensure that the pH value of water reaches 6~9; the dosage of destabilizing agent is about 5~15% of the treatment amount; The dosage is about 0.5~1% of the treatment amount; the dosage of the oxidizing agent is about 0.5~2% of the treatment amount; the dosage of the fast settling agent is about 1~2% of the treatment amount.

Pharmacy and dosage?

PAC preparation method and dosage

There are no special requirements for preparation, the weight ratio of the prepared solution is generally 10-20%, and the dosage during application is generally about 200-300PPM (add 200-300mg of PAC per liter of water). For the calculation of the set value in the dosing pump flowmeter, see the method for calculating the PAM dosing amount below.

PAM preparation method and dosage

1) Preparation method

The use form of PAM is 0.3-0.5% aqueous solution. It is prepared with tap water. When configuring, it must be noted that PAM must be evenly and dispersedly dropped into the continuously stirring water, and it must be ensured that it is dispersed in the water. Separate particles, do not form Otherwise, once a large particle group is formed, it is difficult to continue to dissolve, and a large particle group of medicine-in-water is formed. When preparing, stir well to dissolve it. The prepared solution is easily hydrolyzed and should be used up on the same day.

2) Addition amount

After adding PAM to sewage or sludge, it should be mixed effectively. The mixing time is generally 10-30 seconds, generally not more than 2 minutes. The specific amount of PAM used has a great relationship with the concentration, properties and treatment equipment of colloids and suspended solids in sewage or sludge. -10 grams, the amount of sludge treatment is generally within 3-10PPM, that is, adding 3-10 grams per ton of water, the amount of sludge treatment is more, and the optimal amount should be obtained through a lot of experiments. According to the optimal dosage concentration (PPM ○1 concentration of polyacrylamide to be added), influent flow rate (t/h) and the prepared polyacrylamide solution concentration (PPM ○2 prepared polyacrylamide concentration), the The displayed value (LPM) on the outflow dosing pump flowmeter, namely: inlet water flow (t/h)/60×PPM ○1

To add polyacrylamide concentration /PPM ○2 prepared polyacrylamide concentration. For example, the amount of water inflow=100 t/h, the optimum dosage of PPM○1=10ppm, and the preparation concentration is 2‰ (3Kg of medicine is dissolved in 1.5t of water), then the flow indication of the medicine should be adjusted to 100/60*10/2 =8.3LPM scale.

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