In-situ combination method used for surface water black odorous sediment remediation

A black and odorous bottom sludge and combined method technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of low adsorption capacity, high price, in-situ pollution of bottom sludge, etc. , to reduce the concentration of total phosphorus and nitrate nitrogen, enhance the adsorption capacity, and achieve the effect of repeated utilization

Inactive Publication Date: 2016-06-15
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing problems of this in-situ remediation technology for surface water contaminated sediment are: (1) the price of cationic surfactant-modified zeolite is generally high. The cover system has been placed in the water body, which will cause an increase in cost, thus hindering the large-scale application of the method; (2) the adsorption capacity of cationic surfactant modified zeolite to phosphate is not high, when injected into the bottom After the nitrate in the mud is consumed, the effective duration of the overburden system to control the release of phosphorus from the sediment is limited after all, which will hinder the large-scale application of this method

Method used

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  • In-situ combination method used for surface water black odorous sediment remediation
  • In-situ combination method used for surface water black odorous sediment remediation
  • In-situ combination method used for surface water black odorous sediment remediation

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Preparation of zirconium modified zeolite:

[0044] 1. Adopting zirconium oxychloride octahydrate to prepare a zirconium oxychloride solution whose mass concentration is 50g / L;

[0045] ②Weigh the natural zeolite with a particle size of 200 mesh and place it in a container, then take out a zirconium oxychloride solution with a mass concentration of 50g / L and fully mix it with the natural zeolite according to the liquid-solid ratio of 10mL / g;

[0046]③ Adjust the pH of the mixed solution obtained in step ② to 10 with a sodium hydroxide solution having a concentration of 2 mol / L. After the reaction is completed, perform solid-liquid separation, wash, and dry to obtain zirconium-modified zeolite.

[0047] experiment procedure:

[0048] Take 6 2.5L Erlenmeyer flasks, and add 800g of wet sludge to each Erlenmeyer flask. The six Erlenmeyer flasks were treated differently.

[0049] No treatment was added to the first Erlenmeyer flask as a control group.

[0050] Inject...

Embodiment 2

[0067] (1) Preparation of zirconium modified zeolite:

[0068] ①Adopt zirconium oxychloride octahydrate to configure a zirconium oxychloride solution with a mass concentration of 50g / L;

[0069] ②Weigh the natural zeolite with a particle size of 200 mesh and place it in a container, then take out a zirconium oxychloride solution with a mass concentration of 50g / L and fully mix it with the natural zeolite according to the liquid-solid ratio of 10mL / g;

[0070] ③ Adjust the pH of the mixed solution obtained in step ② to 10 with a sodium hydroxide solution having a concentration of 2 mol / L. After the reaction is completed, perform solid-liquid separation, wash, and dry to obtain zirconium-modified zeolite.

[0071] (2) Preparation of cationic surfactant modified zeolite:

[0072] ① Take a certain quality of natural zeolite with a particle size less than 0.075mm and place it in a container, then pipette a certain volume of a 25mmol / L cetyltrimethylammonium chloride (CTAC) solutio...

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Abstract

The invention belongs to the technical field of environment protection and particularly relates to an in-situ combination method used for surface water black odorous sediment remediation. The method includes: adding zeolite modified by zirconium to a position above a sediment-water interface, and stirring or hydraulically disturbing to mix sediment with the zeolite modified by the zirconium; injecting nitrate into the sediment; adding the zeolite modified by the zirconium and zeolite to the position above the sediment-water interface to form a first covering system; covering the first covering system with a second covering system built by geotechnical cloth wrapping special absorbent materials; continuously remedying for a certain period of time, then removing the second covering system, and allowing the first covering system to be still placed at the position above the sediment-water interface. The method has the advantages that the method combines nitrate injection, adding of the zeolite modified by the zirconium, covering by the zeolite/zeolite modified by the zirconium mixture and covering by the geotechnical cloth wrapping the special absorbent materials to remedy the black odorous sediment and control the release of sediment ammonia, nitrogen and total phosphorus, and the method can effectively prevent the nitrate from leaking into overlying water.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an in-situ combination method for repairing black and odorous bottom mud of surface water bodies. Background technique [0002] At present, many surface water bodies such as rivers, reservoirs and lakes in our country are seriously polluted. Many surface water bodies are not only polluted by pollutants such as nitrogen, phosphorus, heavy metals and organic matter, but also often have black and odorous phenomena. Sediment is not only an important destination and reservoir for pollutants entering surface water bodies, but also an endogenous source of water pollution on surface water bodies. Especially when exogenous pollution is effectively controlled or completely cut off, sediment will become an important source of pollutants in the overlying water of surface water bodies. Therefore, remediation of polluted sediment has important practical significan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F101/16
CPCC02F11/00C02F2101/16
Inventor 林建伟詹艳慧邢云青姜博汇王星星章喆
Owner SHANGHAI OCEAN UNIV
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