A slow-release contaminated sediment in-situ repair material and its preparation method and application
A technology for in-situ remediation and polluted sediment, applied in the direction of sludge treatment, water pollutants, oxidation treatment sludge, etc., can solve the problems affecting the efficiency of sediment remediation, the improvement of total nitrogen index in water body, and the complex composition of chemicals, etc. Achieve the effects of reducing engineering costs, controlling the release rate, and improving the micro-organisms and micro-ecological structure of the river
Active Publication Date: 2020-11-03
清上(苏州)环境科技有限公司
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Problems solved by technology
However, the addition of nitrate will lead to an increase in the total nitrogen index of the water body
More importantly, nitrate has a high solubility and will be quickly exchanged into the water body through concentration gradients, hydrodynamic forces, etc., affecting its efficiency in sediment remediation
[0005] The invention patent with the application publication number of CN 109607829 A discloses a black and odorous water repairing agent and its preparation method. Although the repairing agent of this patent can efficiently and permanently repair the black and odorous water, the composition of the agent is relatively complicated, and its Including the inner core and the outer shell, the inner core is composed of binder, foaming agent, aggregate, compound bacterial preparation, compound mineral and water; the outer shell is composed of binder, oxygen release agent, ammonia nitrogen oxidizer, aggregate, admixture and water
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Embodiment 1
[0045] Example 1 Preparation of in situ repair material
[0046] (1) preparation molar concentration is the silicate solution of 4mol / L (silicate is sodium silicate, and solvent is water);
[0047] (2) Stir with a magnetic stirrer, control the magnetron speed at 400rpm, slowly add an acid solution (the acid solution is hydrochloric acid, the concentration is 1mol / L) to the silicate solution, and monitor the pH value of the system;
[0048] (3) When the pH value is about 4, use a magnetic stirrer to stir, control the magnetic sub-rotational speed at 400rpm, and add oxyanion salt particles (the oxyanion salt particles are calcium nitrate) into the system; wherein, The molar ratio of oxyanion salt to silicate is 5:1;
[0049] (4) Stir with a magnetic stirrer, control the rotation speed of the magnet at 100rpm and continue to add the acid solution (the acid solution is hydrochloric acid, the concentration is 1mol / L) until the pH is 2.5, and react for 80min;
[0050] (5) Stir wit...
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Abstract
The invention provides a slow-release contaminated sediment in-situ repair material, which adjusts the pH of the silicate solution to 3-4.5, adds oxygen-containing anion salt, and adjusts the pH of the reaction system under stirring conditions 2.2 to 2.6, after reacting for 60 to 120 minutes, add cement and continue to stir and react for 120 to 240 minutes, and then dry to obtain the in-situ repair material, wherein the feeding of the oxyanion salt and the silicate is controlled The molar ratio is 1:2-10:1, and the added mass of the cement is 0.5-10 times the sum of the mass of the oxyanion salt and the silicate. The repairing material of the present invention has a high content of active components, a slow and controllable release rate, and can sustainably play a repairing effect. It can be applied to the treatment of polluted rivers, lakes and other water bodies, and can also be applied to the treatment and restoration of polluted sites. .
Description
technical field [0001] The invention belongs to the technical field of new materials for water treatment, and in particular relates to a slow-release contaminated sediment in-situ repair material and a preparation method and application thereof. Background technique [0002] In the past 30 years, the rapid economic and social development of our country has caused serious pollution of water bodies such as rivers and lakes in many cities or regions. Many rivers show the characteristics of black odor or even moderate black odor, and many lakes and urban inland rivers show eutrophication. It will seriously affect the health of the water ecosystem and the improvement of the quality of the water environment, and reduce the quality of life of the surrounding residents and the improvement of the demand for a beautiful environment. Harnessing the river water environment is an important task for my country's current water environment governance and comprehensive improvement of water q...
Claims
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IPC IPC(8): C02F11/00C02F101/30
CPCC02F2101/30C02F11/06C02F2101/16C02F2209/04
Inventor 郭鹏王晶晶
Owner 清上(苏州)环境科技有限公司