Method for upgrading and expanding sequencing batch biological pool by utilizing moving bed biofilm process

Abstract

The invention discloses a method for upgrading and expanding a sequencing batch biological pool by utilizing a moving bed biofilm process, and belongs to the technical field of sewage treatment. According to the method, a reaction pool is divided into an anoxic / anaerobic zone, an anoxic zone, an aerobic zone and an aerobic nitrification enhancement zone by partition walls according to a clockwise direction under the condition that the volume of the reaction pool is not increased; the sequencing batch treatment to a liquid to be treated is carried out periodically, so that the advantage of moving bed biofilm suspension fillers capable of enhancing nitrification so as to prolong the standing time of the anoxic zone to improve the denitrification of a system is exerted, and the ability of the system for TN removal in an upgrading manner or expansion reconstruction is enhanced. Thus, the method is particularly suitable for the upgrading and the expansion reconstruction of a built sewage treatment plant.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for upgrading and expanding the capacity of a sequencing batch biological pool in a moving bed biofilm process. Background technique [0002] The sequence batch biological tank (such as SBR / CAST / CASS series) system is a batch biological reaction tank, in which the process of water inflow / aeration-aeration-sedimentation-decanting is repeated continuously, The biological reaction process and the separation process of mud and water are combined in one pool, which has the characteristics of intermittent water inflow and intermittent water outflow. [0003] Sequencing batch biological pool (such as CAST / CASS process) is composed of biological anaerobic selection zone, aerobic and aerobic zone and main aeration reaction zone, such as figure 1 As shown, the biological anaerobic selection zone is a small volume zone set at the front end of the sequencing ba...

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Problems solved by technology

[0004] The operation cycle of the sequence batch bio-pool can generally be divided into five steps: 1. Water inflow / aeration step, sewage enters the selection area to mix with return sludge, submersible mixer runs; 2. Aeration step, aeration by blower The device aerates the reaction tank with oxygen, at this time the organic pollutants are oxidized and decomposed by microorganisms, and at the same time the NH in the sewage 4 -N is converted to NO by nitrification by nitrifying bacteria 3 -N; 3. In the precipitation step, the aeration is stopped at this time, and the microorganisms use the remaining dissolved oxygen DO in the water to oxidize and decompose; the reaction tank gradually transforms from an aerobic state to an anoxic state, and begins to denitrify. After denitrification, nitrogen gradually The denitrification effect is achieved; the activated sludge gradually sinks to the bottom of the tank, and the upper layer of water becomes clear; 4. The decanting step, after the precipitation is completed, the decanter placed at the end of the reaction tank starts to work, and is gradually discharged from top to bottom Supernatant; at this time, the reaction tank gradually transitions to an anaerobic state to continue to strengthen denitrification, and discharge sludge for a few minutes before the end of drainage; 5. In the idle step, the decanter rises to the original position; the nitrogen and phosphorus removal effect of the above biological pool poor

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