System and method for constant water level sequential batch type sewage treatment system with continuous variable volume

Abstract

The invention discloses a system and a method for constant water level sequential batch type sewage treatment system with continuous variable volume. The method includes continuously injecting sewage into a constant water level variable volume adjusting area to enable an adjustable volume area to float on the liquid level in separation mode, injecting water to a constant water level variable volume reaction area through a distribution pump, injecting water to a constant water level variable volume water quality stabilizing area through a constant water level water decanting device and a waterdecanting pump, enabling supernate after reaction to be discharged into the supernate of the a constant water level variable volume water quality stabilizing area on the other side of the constant water level variable volume reaction area, pass through a smoothing clearing area and finally pass through an inclined plate clearing area and continuously discharging purification water equivalent withpreprocessing feeding water. The system and the method resolve the technical problem that denitrification and dephosphorization efficiency is low, single process structure water outlet index cannot meet requirements of indexes of the national standard first grade A, and process structure is complex. The system has the advantages of being simple in structure, low in integral process energy consumption, good in processing effect and the like.

Description

technical field [0001] The invention relates to an integrated sewage treatment system using multiple mechanisms, in particular to a continuously variable volume constant water level sequential batch sewage treatment system and method. Background technique [0002] At present, the main application types of secondary biochemical processes that must meet the first-level A of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" are as follows: [0003] 1. If figure 1 The traditional biological nitrogen and phosphorus removal process shown——A 2 O process, its advantage is that the process is simple, anaerobic, anoxic, and aerobic are set separately and run alternately, which can achieve the purpose of removing organic matter, denitrification, and phosphorus removal at the same time, and can inhibit the growth of filamentous bacteria at the same time, and there is basically no pollution. Mud swelling problem. The disadvantages are: due to the short sludge age o...

AI Technical Summary

Problems solved by technology

The disadvantages are: due to the short sludge age of phosphorus-accumulating bacteria, the internal circulation of the system is limited, and a large amount of nitrate nitrogen in the return sludge inhibits the release of phosphorus in the anaerobic tank; and the dissolved oxygen in the return sludge limited, the effect of phosphorus removal may not be ideal; at the same time, since the effect of nitrogen removal depends on the reflux ratio of the mixed liquid, A 2 The reflux ratio of the mixed liquid in the O process should not be too high (≤200%), and the denitrification effect cannot meet the higher requirements

Its disadvantages are: the flow distribution has a great influence on the operation status of each pool; the amount of returned sludge has a great influence on the sludge concentration and the total nitrogen removal rate; the phosphorus removal effect is not high; the operation adjustment is complicated

The disadvantages are: the process structure is complicated, and the system operation and maintenance are complicated; the post-denitrification adopted is not conducive to the deployment and supply of carbon sources, and the denitrification rate is limited

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