Preparation method and application of eutrophic water body sediment phosphor in-situ passivating agent

A technology of eutrophication and passivation, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve problems such as sediment pollution, reduce phosphorus content and increase water transparency Effect

Inactive Publication Date: 2012-07-11
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation method and application of an environmentally friendly sediment phosphorus in-situ passivator without secondary pollution, which solves the problem of sediment pollution control in deep water and sub-deep water environments, with simple operation and low cost

Method used

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  • Preparation method and application of eutrophic water body sediment phosphor in-situ passivating agent
  • Preparation method and application of eutrophic water body sediment phosphor in-situ passivating agent
  • Preparation method and application of eutrophic water body sediment phosphor in-situ passivating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The sodium-based bentonite used in the passivating agent in this example comes from Xinyang, Henan. The bentonite is ground to a particle size2 (SO 4 ) 3 18H 2 O) The sediment phosphorus in-situ passivator was prepared after uniform mixing at a mass ratio of 1:1. Application test: Weigh 200g of the surface sediment at the bottom of the eutrophic water body, add 700ml of filtered lake water by siphon method, weigh 2g of the passivating agent before and after modification after stabilization, make a mixed solution of the passivating agent, and spray it directly on the On the surface of the water body, observe the change of dissolved inorganic phosphorus (DIP) content in the overlying water, and compare the passivation effect of the passivator before and after modification. Such as figure 1 , the sodium-based bentonite uses surface adsorption to absorb phosphorus in a short period of time before modification, reducing the DIP content in the water. Once it reaches satura...

Embodiment 2

[0038] The sodium-based bentonite used in this example comes from Xinyang, Henan. The bentonite is ground to a particle size2 (SO 4 ) 3 18H 2 O) According to the mass ratio of 2:1, the in-situ passivator of sediment phosphorus is prepared by uniformly mixing, and the added passivator (equivalent to the amount of passivator in the water body is 0.5g / L, Al 3+ content 20mg / L). Weigh and weigh 4kg of the surface sediment at the bottom of the eutrophic water body, add 30 liters of deionized water with the siphon method, and add 22g of the modified passivating agent after stabilization, and the passivating agent is made into a mixed solution first, and sprayed directly on the water body On the surface, the content of dissolved inorganic phosphorus (DIP) and the pH value of the overlying water were observed over time. Such as figure 2 , although the pH decreased after adding the passivating agent, the release of phosphorus in the sediment decreased rapidly, and the amount of rel...

Embodiment 3

[0041] The sodium-based bentonite used in this example comes from Xinyang, Henan. After the bentonite is naturally dried, it is crushed to a particle size of 2 (SO 4 ) 3 18H 2 O) Prepare sediment phosphorus passivation agent by mixing at a mass ratio of 5:1. Weigh 200g of the surface sediment at the bottom of the eutrophic water body, add 700ml of filtered lake water by siphon method, weigh 6g of passivator after stabilization, and make the passivator into a mixed solution, which is directly sprayed on the surface of the water body, and observed The content of dissolved inorganic phosphorus (DIP) in the overlying water changes, and the content of DIP in the overlying water changes. Such as image 3 , the passivator can control the DIP content in water below 0.02mg / L and reduce the release of phosphorus from sediments. At the same time, it can also be seen that after using the passivating agent, the phosphorus content of the overlying water body has been in a low range, whi...

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Abstract

The invention discloses a preparation method and an application of a eutrophic water body sediment phosphor in-situ passivating agent. The method comprises the following steps: uniformly mixing the sodium bentonite to modified substrate with mass ratio of 1-5:1, configuring to mixed liquor or directly and uniformly sprinkling on the surface of the water body. The passivating agent can rapidly absorb dissolved inorganic phosphorus (DIP) and suspended matters through the surface sorption of the passivating agent during a settlement process, and can increase the transparency of water body; on the other hand, the passivating agent settles to the sediment surface for forming a masking layer, a physical insulation effect and a chemisorption effect can prevent the sediment from releasing phosphor in the sediment to overlying water, the purpose of in-situ controlling the releasing of sediment phosphor can be reached, thereby the phosphor content in overlying water can be minimized, and the water body eutrophication can be inhibited. The application of the passivating agent can minimize more than 80% of phosphor releasing amount, the application scope is wide, and the passivating agent is suitable for controlling and treating the release of the sediment endogenous phosphor in lake, reservoir and the like, and has the advantages of simple operation, low cost , good environmental protection benefit and the like.

Description

Technical field [0001] The present invention involves the preparation method of treating potions for the treatment of internal contamination of nutrient -rich water bodies. Specifically, it is a preparation method and application of the in situ passivation agent of a nutrient -rich water body mud phosphorus. [0002] Background technique [0003] The rich water body nutrition is currently an important problem of water pollution. Phosphorus (P) is the main factor that causes the nutritionalization of water bodies. It is generally believed that the total phosphorus content of the water body exceeds 0.02 mg / L.The source of phosphorus in the water body includes exogenous and endogenous. After the exogenous pollution is effectively controlled, the weak binding state phosphorus, iron -manganese -manganese -binding state phosphorus, and organic phosphorus in the bottom mud will be affected by the environment.(Such as temperature, pH, dissolving oxygen, oxidation potential, etc.), gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/52
Inventor 陈敬安杨永琼王敬富杨海全曾艳计永雪李健
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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