Thread Content
(1) The most feasible and economical method for stabilizing the influent to the aeration tank is effluent recirculation, which is used to dilute and adjust the organic matter concentration in the influent, keeping it within a certain range. A prerequisite for backflow of treated water is that the treatment capacity of the wastewater treatment plant must be greater than the actual inflow volume. (2) Control the liquid level in the homogenization tank (regulation tank). Operating at high liquid levels can reduce or even eliminate the buffering capacity of the homogenization tank ； Operating at a low liquid level not only results in poor homogenization but also allows oil and impurities at the bottom of the homogenization tank to enter the aeration tank, causing the activated sludge to be disturbed and rise to the surface. The liquid level should be maintained between 50% and 70%. (3) Apply nutrients reasonably. Due to the imbalance in the proportions of nutrients in industrial wastewater, there is often an abundance of carbon sources while nutrients such as nitrogen and phosphorus are insufficient, so these need to be added separately during the treatment of industrial wastewater. Generally, urea and phosphates are used as nitrogen and phosphorus sources, respectively, and the amounts added should be sufficient to meet the requirements; excess amounts should be avoided. (4) If necessary, a neutralization tank is installed at the inlet of the aeration tank, along with an automatic pH control system consisting of an alkali tank, an acid tank, a pH detector, and a pH automatic control valve, so as to keep the pH value of the water entering the aeration tank within the required range. (5) Industrial wastewater treatment plants should consider installing tanks with a large capacity for water equalization, in order to prevent the aeration tanks from being subjected to hydraulic load shocks. (6) Pure oxygen aeration is used. (7) The sludge that has accumulated, deteriorated, and risen to the surface can be broken up; once it sinks back down, aeration can continue. (8) To address sludge floating caused by sludge poisoning, increase aeration volume, reduce water inflow, and remove dead sludge. (9) The microbial composition of activated sludge mainly depends on the wastewater composition, flow pattern, operating conditions, and appropriate design.