Can you talk about the advantages and disadvantages of activated sludge process in sewage treatment?

Activated sludge process is the most widely used aerobic biological treatment technology for sewage at present.

Advantages: It consists of aeration tank, sedimentation tank, sludge reflux and residual sludge removal system, with simple procedures and low equipment requirements. Soluble organic pollutants in sewage are adsorbed by activated sludge and decomposed by microorganisms living on activated sludge, thus purifying sewage.

Disadvantages: 1 Sewage should contain enough soluble and easily decomposed organic matter;

2. There should be enough dissolved oxygen in the sludge mixture;

3. It is necessary to ensure the continuous backflow of activated sludge and remove excess sludge, otherwise the TP of effluent will be high, which will increase the workload;

4. Influencing factors in the process of activated sludge treatment system (such as dissolved oxygen, water temperature, nutrients, pH value, inhibitors, organic loading rate, etc.). ) should be considered.