Sulfur-iron autotrophic denitrification device and application thereof

Abstract

The invention discloses a sulfur-iron autotrophic denitrification device and application thereof, and belongs to the technical field of sewage treatment. According to the discontinuously-arranged structure-replaceable ferro-sulfur filler, a ferro-sulfur filler layer comprises sulfur particles and an iron filler layer, supporting layers are arranged on the upper portion and the lower portion of theiron filler layer, a screen is arranged in the middle of the iron filler layer, and water distribution holes are formed in the supporting layers; the iron filler layer is formed by placing scrap ironin the screen, and an iron filler replacement opening is further formed in the side face of the iron packing layer. Scrap iron is placed in the screen and arranged in a multi-stage sulfur-iron arrangement mode, the effect of iron chemical phosphorus removal can be brought into full play, when the scrap iron is consumed and cannot meet the phosphorus removal requirement, the iron filler can be replaced through the replacement opening, convenience and quickness are achieved, and the problems of hardening and replacement of the filler are effectively avoided. And stone particles are added into the sulfur packing layer to uniformly distribute water.

Description

technical field [0001] The invention relates to a sulfur-iron autotrophic denitrification device and its application, belonging to the technical field of sewage treatment. Background technique [0002] At present, domestic urban sewage treatment plants have generally implemented the first-level A discharge standard (hereinafter referred to as "first-level A standard") in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), and the effluent COD, total nitrogen, ammonia nitrogen, The indicators of major pollutants such as total phosphorus shall not exceed 50mg / L, 15mg / L, 5mg / L, and 0.5mg / L respectively. On June 1, 2018, the "Discharge Limits of Main Water Pollutants of Urban Sewage Treatment Plants and Key Industries in Taihu Lake Area" (DB 32 / 1072-2018) was promulgated and implemented, requiring urban sewage treatment plants in Taihu Lake area of ​​Jiangsu Province to be at Grade A Standards were raised on the basis of standards, among which ...

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Problems solved by technology

In order to achieve the standard discharge of effluent, most sewage treatment plants need to ensure sufficient hydraulic retention time in the biochemical tank. The hydraulic retention time of anaerobic, anoxic and aerobic sections is generally not less than 1h, 3h and 8h respectively, and is To realize the deep removal of nitrogen and phosphorus, the effluent of the biochemical tank generally needs to be equipped with a denitrification filter for deep denitrification, coagulation sedimentation filtration or air flotation process to achieve deep phosphorus removal, resulting in a long sewage treatment process and a large area. Moreover, the dosage of carbon sources and phosphorus removal agents is relatively large, which increases operating costs and is not conducive to low-carbon emissions and circular economy development models

In the prior art, iron filings and sulfur are usually directly formed into a mixed layer, which tends to harden the iron filings and sulfur particles, resulting in short flow, which is not conducive to the removal of nitrogen and phosphorus.

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