Sewage treatment process

[0006] The present invention will be described in further detail below in conjunction with the flowchart.

[0007] Each CASS reaction tank is composed of three parts, namely, flora selection area, facultative oxygenation area and main reaction area. The bacterial colony selection area is set at the front end of the CASS pool, which is a small-volume pool (about 10% of the total volume of the reactor). Most of the selection area works under anaerobic or facultative conditions.

[0008] The sludge return pump is used to pump the sludge from the main reaction area and mix it with the newly incoming sewage, which not only can

[0009] The activated sludge can be adsorbed quickly, and it can also speed up the removal of soluble substances, and can remove difficult-to-degrade substances.

[0010] Play a better role in substitution, of course, can also achieve effective release of phosphorus in sludge under anaerobic conditions.

[0011] Setting a flora selection area before the CASS reaction area can also improve the sedimentation performance of the sludge, thereby effectively solving the situation of sludge expansion. In addition, the bacterial colony selector can also produce denitrification (that is, the sludge return pump is pumped back

[0012] Most of the mixed liquid of sewage and mud contains about 2mg/l of definite nitrogen), which can remove about 20% of the nitrogen removal of sewage.

[0013] right. The selection zone can work with a fixed volume or change the volume. A system with multiple CASS reaction cells can also be used

[0014] Use inlet and distribution tanks as selection areas.

[0015] Part of the sludge is extracted from the main reaction zone through the sludge return millet back to the selected zone, and the amount of sludge withdrawn is designed based on the sludge in the main reaction zone once. The facultative oxygen zone can not only play an auxiliary role in buffering the quality and quantity of new sewage, but also can effectively release phosphorus and strengthen the oxidation process of nitrogen compounds. The main reaction zone is the reaction zone where the organic substances are finally removed. In the reaction, most of the aeration and air intake in the main reaction zone are controlled, so that the sewage and floating sludge in the main reaction zone are fully in contact with the air, so as to be in aerobic state, but the inside of the activated sludge is in an aerobic state. In the oxygen situation, the transmission of dissolved oxygen to the inside of the sludge is restricted, but at this time the transmission of nitrate nitrogen from the inside of the sludge floc to the sewage is not restricted, and finally the confirmation and reverse extraction reactions are generated in the main reaction zone. Organic pollutants are degraded. Sewage continuously enters the bacterial colony selection area. The microorganisms in the bacterial colony quickly absorb and attach more than 80% of the soluble organic matter in the sewage through the action of enzymes. After a high-load matrix, the rapid increase process is correct. The water quality, pH value and toxic substances of the newly incoming sewage can achieve the buffering effect, and then the sewage enters the main reaction tank through the partition wall, after a relatively low-load matrix decomposition, and finally achieves the separation of the sludge and the sewage Come.