A method for in-situ restoration of black and odorous river sediment

A technology for in-situ restoration of river sediments, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. Black and odorous bottom mud, maintain repair effect, reduce water-solubility loss effect

Active Publication Date: 2019-09-13
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

However, simple injection of slow-release agent has the problems of low nitrate release and mass transfer speed, and slow repair effect.

Method used

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  • A method for in-situ restoration of black and odorous river sediment
  • A method for in-situ restoration of black and odorous river sediment
  • A method for in-situ restoration of black and odorous river sediment

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example

[0059] Collect the polluted sediment of a black and smelly river. Referring to Part 5 of the Marine Monitoring Specification: Sediment Analysis (GB17378.5-2007), the content of sulfide (acid volatile sulfide, AVS) in the sediment measured by methylene blue spectrophotometry was 2300mg-S / kg dry mud. Referring to Part 5 of the Marine Monitoring Specification: Sediment Analysis (GB17378.5-2007), the potassium dichromate oxidation-reduction capacity method was used to measure the total organic carbon (TOC) content in the sediment to be 3.5%.

[0060] The theoretical nitrate dose calculation formula for AVS removal is

[0061]

[0062] The theoretical dosage calculation formula of nitrate for TOC removal is

[0063]

[0064] Nitrate theoretical dose (mg-N / kg dry mud) = W AVS +W TOC = 1610 mg-N / kg dry mud + 49 mg-N / kg dry mud = 1659 mg-N / kg dry mud. The dosage is set as 100% theoretical dosage.

[0065] Set the dosage combinations of liquid biochemical agents and granular...

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Abstract

The invention discloses a method for in-situ repairing of bottom mud of black and odorous riverways. The method comprises the following steps: S1, preparing a liquid biochemical agent containing nitrate and a granular slow-release biochemical agent containing nitrate; and S2, synchronously applying the liquid biochemical agent and the granular slow-release biochemical agent into bottom mud, wherein the granular slow-release biochemical agent is slowly released according to a set release velocity and release time. The method is capable of rapidly and effectively removing black and odorous substances in bottom mud and maintaining a repairing effect for a long time, is applicable to characteristics that a tidal waterway is high in content of sulfate and intense in hydraulic power disturbance, and is simple in agent raw material and convenient in process operation.

Description

technical field [0001] The invention belongs to the field of water environment treatment and restoration, and in particular relates to a method for in-situ restoration of black and odorous river bottom mud. Background technique [0002] Polluted sediment is an important source of endogenous pollution of urban river water bodies, and it is also one of the important reasons for water bodies to become black and smelly. While effectively intercepting and controlling the input of exogenous pollutants, it is necessary to adopt control measures for endogenous sediment pollution. The commonly used restoration methods include physical methods, chemical methods and biological ecological methods. Physical methods mainly include dredging, artificial re-oxygenation, water diversion, etc. Chemical methods mainly include enhanced flocculation, chemical oxidation and so on. Bioecological methods mainly include in-situ injection of biochemical agents, addition of microbial agents, additio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/34
Inventor 陶益刘小宁张锡辉宋乾武周奎宇高迎岌
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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