Bioretention pond filler based on sulfur autotrophic denitrification

A bioretention tank and denitrification technology, applied in biological water/sewage treatment, water pollutants, anaerobic digestion treatment, etc., can solve the problems of secondary pollution, effluent chemical oxygen demand (COD), effluent turbidity, etc.

Inactive Publication Date: 2021-03-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During heterotrophic denitrification, it is necessary to add carbon sources in the submerged area. Some studies have shown that when adding oak wood chips as an organic carbon source in the submerged area, there will be problems of turbidity in the effluent and high COD in the effluent, which will easily cause secondary denitrification. Pollution

Method used

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  • Bioretention pond filler based on sulfur autotrophic denitrification
  • Bioretention pond filler based on sulfur autotrophic denitrification
  • Bioretention pond filler based on sulfur autotrophic denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The three fillers of sulfur, limestone and quartz sand were made into mixed fillers according to different volume dosage ratios, and the dosage ratios are shown in Table 1. All fillers were washed with distilled water and ultrapure water before the filling experiment, centrifuged at a speed of 2000-3000r / min, and repeated 3-5 times, then dried naturally in a cool place and passed through a 10mm sieve before filling. A support layer is arranged below the mixed packing layer, the support layer is composed of stones, and the height of the support layer is 5cm.

[0026] The mixed filler is used for the treatment of street rainwater (collected from Tianjin Airport Industrial Park after rain), with different filler ratios (sulfur:limestone:quartz sand), influent and effluent nitrate nitrogen (NO 3 - -N) concentration and removal rate are as shown in Table 1.

[0027] Table 1 Effect of different filler ratios on NO in street rainwater 3 - -N removal effect

[0028]

[...

Embodiment 2

[0031] Three kinds of fillers, pyrite, dolomite and gravel, are made into mixed fillers according to different volume dosage ratios, and the dosage ratios are shown in Table 2. All fillers were washed with distilled water and ultrapure water before the filling experiment, centrifuged at a speed of 2000-3000r / min, and repeated 3-5 times, then dried naturally in a cool place and passed through a 10mm sieve before filling. A support layer is arranged below the mixed packing layer, the support layer is composed of stones, and the height of the support layer is 5cm.

[0032] The mixed filler is used for the treatment of street rainwater (collected from Tianjin Airport Industrial Park after rain), with different filler ratios (pyrite: dolomite: gravel), influent and effluent nitrate nitrogen (NO 3 - -N) concentration and removal rate are as shown in table 2.

[0033] Table 2 Effect of different filler ratios on NO in street rainwater 3 - -N removal effect

[0034]

[0035] I...

Embodiment 3

[0037] Five kinds of fillers including sulfur, pyrite, limestone, dolomite and crushed stone were made into mixed fillers according to different volume dosage ratios, and the dosage ratios are shown in Table 3. All fillers were washed with distilled water and ultrapure water before the filling experiment, centrifuged at a speed of 2000-3000r / min, and repeated 3-5 times, then dried naturally in a cool place and passed through a 10mm sieve before filling. A support layer is arranged below the mixed packing layer, the support layer is composed of stones, and the height of the support layer is 5cm.

[0038] The mixed filler is used for the treatment of roof rainwater (collected from Tianjin University Beiyangyuan Campus after rain), with different filler ratios (sulfur: pyrite: limestone: dolomite: gravel), influent and effluent nitrate nitrogen (NO 3 - -N) concentration and removal rate are as shown in table 3.

[0039] Table 3 Effect of different filler ratios on roof rainwate...

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Abstract

The invention provides a bioretention pond filler based on sulfur autotrophic denitrification, which comprises sulfur or pyrite, limestone or dolomite and quartz sand or gravel, and the volume ratio of sulfur or pyrite to limestone or dolomite to quartz sand or gravel is (15: 15): (840). The filler is mainly applied to a submerged area of a bioretention pond and aims to improve the removal rate ofnitrate nitrogen in rainwater, reduce the nitrogen load of subsequently discharged receiving water and reduce the possibility of water pollution such as bloom in combination with a sulfur autotrophicdenitrification process, and the method is relatively low in cost and easily available in raw materials and has relatively great advantages in actual popularization.

Description

technical field [0001] The invention relates to the technical field of rainwater treatment, in particular to a bioretention tank filler based on sulfur autotrophic denitrification. Background technique [0002] Eutrophication is one of the major water pollution problems facing the world today, and nitrogen is one of the main factors causing water eutrophication. With the continuous increase of urbanization rate, the contribution of urban rainfall runoff to nitrogen pollution of receiving water bodies will become more obvious. Studies have shown that about 1 / 2 of the nitrogen pollutants received by urban rivers come from urban rainfall runoff, and 2 / 3 of the river water environment is degraded due to nitrogen pollution in rainfall runoff. Therefore, controlling nitrogen pollution in rainwater is of great significance. [0003] Bioretention pond is an urban stormwater low impact development (LID) technology based on the concept of source control, which has good effects in red...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/2806C02F2101/163
Inventor 王芬段洪利
Owner TIANJIN UNIV
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