November 27, 2020
From the raw water quality analysis, whether it is necessary to adjust the pH, the coagulation reaction PH value is maintained in the neutral range;
The charge of the suspended matter in the wastewater, that is, the colloid, is different, some are positive, some are negative, the same sex repels each other, but the opposite sex attracts each other. Not much else to say. There is also the dosage of the agent. The dosage of the agent is not only related to the water quality of the wastewater, but also related to the composition of the agent itself (PAC-aluminum chloride content, cationic PAM-ionicity, anionic PAM-molecular weight), preferably Determine the best dosing ratio through a small test.
Here we use the speed of the mixer to measure. The speed of the stirrer in the PAC reaction section is generally about 85-100r/min, and the speed of the PAM reaction section is about 20-50r/min. If the medicine is too slow, the mixing is not uniform, and the alum is easy to be broken if it is too fast.
The reaction time here refers to the time it takes for the medicament and suspended solids to form alum. This time is at least 3-15 minutes. However, in order to reduce costs, many manufacturers on site have insufficient reaction time in the front-end coagulation reaction section!
