How much water purifying agent should be added to one ton of sewage in sewage treatment plant?

A ton of sewage in the sewage treatment plant should be added with 200g purifying agent. At present, the water purifying agent used in sewage treatment plants is generally polyacrylamide. Its reagent is the earliest developed organic polymer flocculant, which is widely used in industrial water treatment and sewage treatment because of its good flocculation and coagulant aid. Solid PAM can be dissolved in water in any proportion, and the aqueous solution is a uniform and transparent liquid. The molecular weight has little effect on the solubility, but when the solution concentration is higher than 10%, it can present a gel-like structure due to the bonding of intermolecular hydrogen atoms. Solid powder products must be prepared into aqueous solution before use. In order to prevent the "fisheye" phenomenon in the process of powder dissolution, half of the warm water (no more than 60℃) can be added to the dissolution tank first, and the powder can be slowly added under stirring, and then the remaining water can be supplemented and stirred until it is completely dissolved. Generally, the concentration of aqueous solution is 0. 1-0.05%, or 0.05% can be prepared first. It should be diluted when used, and the storage time of the solution should not exceed 5 days. The solution should be prepared and used as soon as possible, and multi-point continuous addition should be adopted when adding the solution to give full play to the flocculation effect of the product.