Method for controlling nitrogen release in deep denitrification filter bed

Abstract

The invention discloses a nitrogen release technology applied to a deep denitrification filter bed process for sewage treatment. According to the technology, the maximal head loss caused by suspended solids, biological sludge and nitrogen accumulated in a filter bed within a nitrogen release interval period is set to be a fixed value delta Hmax by a total head loss control nitrogen release technology; the value is input into a control system; and when a head loss measurement parameter of the filter bed in the filtration and denitrification processes rises to the delta Hmax, nitrogen release is started. According to the nitrogen release technology in the scheme, gas-water full recoiling is controlled by heat loss experience curve or time generated when filter bed intercept suspended solids. The nitrogen release technology carries out parameter correction by increasing the suspended solids and the biological sludge to cause head loss, can dynamically simulate the process of accumulating nitrogen and then releasing nitrogen in the filter bed, can accurately judge each nitrogen release period, can prolong the filter period of the filter bed, can reduce the nitrogen release frequency of the filter bed, and can lower energy consumption and water consumption in operation of the filter bed.

Description

technical field [0001] The invention is applied to the deep bed denitrification filter of the sewage treatment plant, and mainly improves the service performance of the deep bed denitrification filter by optimizing the nitrogen release technology. Background technique [0002] Deep bed denitrification filter is often used as denitrification denitrification and filtration process in advanced treatment of sewage treatment plant. In the process of denitrification, microorganisms use carbon sources in anoxic environment to convert nitrate nitrogen into nitrogen gas. Nitrogen gas molecules form bubbles through collisions, occupying the gap between filter materials, so that the head loss of the filter bed increases rapidly, and it needs to be released regularly to restore the filter bed Filtration capacity. [0003] The nitrogen release method of the deep bed denitrification filter is to use a certain strength of water to recoil the filter material layer, and the water flow pulls...

AI Technical Summary

Problems solved by technology

The nitrogen release interval is set to a fixed value and cannot be adjusted due to changes in the flow rate or influent nitro-nitrogen concentration, resulting in head loss or premature recovery of the filter bed, increasing energy consumption; or failing to recover in time, increasing energy consumption and shortening Filtration cycle, increase backwash water consumption

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