Method for processing sludge depositing in continuous ring-type reaction tank

Abstract

The invention relates to the technical field of waste water treatment, particularly a method for processing sludge depositing in a continuous ring-type reaction tank, which comprises the following steps: intermittently switching on or off direct neighbor or indirect neighbor aerators so that the sludge mixed liquor in the continuous ring-type reaction tank has a certain flow rate when switching on the aerators in the continuous ring-type reaction tank; and switching off any aerator in the continuous ring-type reaction tank so that the flow direction of part of the sludge mixed liquor can be changed due to the flow rate inertia of the sludge mixed liquor in the tank. The change of the flow direction of the sludge mixed liquor can lift the sludge depositing in the tank, thereby having good capability of stirring and plug-flow. Thus, the invention solves the problem of sludge deposit in the continuous ring-type reaction tank without adding other equipment, and has the advantages of simple realization and favorable treatment effect on waste water.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for sludge deposited in a continuous loop reaction tank. Background technique [0002] The continuous ring reaction tank is usually referred to as the oxidation ditch. It generally adopts mechanical oxygenation and promotes water flow. The mixed liquid of sewage and activated sludge circulates in the ring aeration channel. It is a modification of the activated sludge process. It belongs to a special form of delayed aeration. This form uses a continuous loop reaction tank as a reaction tank. The sludge mixture is continuously circulated in a closed aeration channel in the reaction tank. However, in the actual operation process , the sludge deposition in the continuous loop reaction tank is serious, mainly because the continuous loop reaction tank has not achieved the proper stirring and pushing capacity, and the dissolved oxygen in the continuous lo...

AI Technical Summary

Problems solved by technology

[0002] The continuous ring reaction tank is usually referred to as the oxidation ditch. It generally adopts mechanical oxygenation and promotes water flow. The mixed liquid of sewage and activated sludge circulates in the ring aeration channel. It is a modification of the activated sludge process. It belongs to a special form of delayed aeration. This form uses a continuous loop reaction tank as a reaction tank. The sludge mixture is continuously circulated in a closed aeration channel in the reaction tank. However, in the actual operation process , the sludge deposition in the continuous loop reaction tank is serious, mainly because the continuous loop reaction tank has not achieved the proper stirring and pushing capacity, and the dissolved oxygen in the continuous loop reaction tank is high when all the equipment is turned on, but the local flow rate Very low, resulting in serious sludge deposition, unable to ensure the suspended solids concentration of the sludge mixture in the continuous loop reaction tank, directly affecting the quality of wastewater effluent

[0003] In the prior art, methods such as fan aeration, plug flow device or mud scraper are usually used to treat the deposited sludge in the continuous ring reaction tank. In actual operation, due to the long-term underwater operation of the aerator aerator aerated by the fan, occurrence of When there is a fault, it is usually necessary to clean the entire continuous loop reaction tank to solve the problem, which is very difficult to repair and affects the progress of the entire sewage treatment; the addition of a flow booster or a mud scraper not only increases the equipment, but also increases a certain amount of energy consumption. The probability of failure during the actual operation is high, the maintenance cost is high, and the treatment effect on wastewater is also poor