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Method for in-situ control of phosphorus release from eutrophic water bottom sediment

An in-situ treatment and eutrophication technology, applied in the field of water environmental pollution treatment, can solve the problems such as the inability to effectively control the release of sediment, and achieve the effect of convenient operation, low cost and remarkable effect

Inactive Publication Date: 2010-10-27
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The physical adsorption method is to use the adsorption affinity of some porous or large specific surface solid substances to the phosphate radical in the water to realize the phosphorus removal process. This method is easily affected by the disturbance of benthic organisms, and the sediment interface with strong benthic biological activities, The traditional physical adsorption method cannot effectively control the sediment release caused by bioturbation

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  • Method for in-situ control of phosphorus release from eutrophic water bottom sediment
  • Method for in-situ control of phosphorus release from eutrophic water bottom sediment
  • Method for in-situ control of phosphorus release from eutrophic water bottom sediment

Examples

Experimental program
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Embodiment 1

[0031] Taking the bottom sediment of Hangzhou West Lake as the treatment object, the comparative experiment was carried out with the compound aeration of ozone and calcium chloride solution and no treatment group.

[0032] Add the bottom mud from the West Lake to an opaque PVC pipe with a height of 120cm and a diameter of 80cm. The height of the mud filling is 30cm, and the height of the overlying water is 50cm to construct a simulated lake bottom mud-overlying water system. An aeration and dosing integrated machine is adopted. The aeration position of the composite aeration head is the bottom mud-overlying water interface. First, ozone is provided by an ozone generator for ozone aeration. The ozone aeration rate is 9g / min, and the aeration time is For 6 hours, then provide calcium chloride solution through the dosing pump, the concentration of calcium chloride solution in the dosing pump is 50g / L, and the application rate is 100mL / m 2 The injection rate of sediment and calciu...

Embodiment 2

[0037] Taking the bottom sediment of Jianhu Lake in Shaoxing as the treatment object, a comparative experiment was carried out with the compound aeration of ozone and calcium chloride solution and no treatment group. Add the bottom mud from Jianhu Lake to an opaque PVC pipe with a height of 120cm and a diameter of 80cm. The height of the mud filling is 30cm, and the height of the overlying water is 50cm to construct a simulated lake bottom mud-overlying water system. An aeration and dosing integrated machine is adopted. The aeration position of the composite aeration head is the bottom mud-overlying water interface. First, ozone is provided by an ozone generator for ozone aeration. The ozone aeration rate is 10g / min, and the aeration time is For 4 hours, then provide calcium chloride solution through the dosing pump, the concentration of calcium chloride solution in the dosing pump is 50g / L, and the application rate is 80mL / m 2 The injection rate of sediment and calcium chlori...

Embodiment 3

[0040] Taking the bottom sediment of Jianhu Lake in Shaoxing as the treatment object, a comparative experiment was carried out with the compound aeration of ozone and calcium chloride solution and no treatment group. Add the bottom mud from Jianhu Lake to an opaque PVC pipe with a height of 120cm and a diameter of 80cm. The height of the mud filling is 30cm, and the height of the overlying water is 50cm to construct a simulated lake bottom mud-overlying water system. An aeration and dosing integrated machine is adopted. The aeration position of the composite aeration head is the bottom mud-overlying water interface. First, ozone is provided by an ozone generator for ozone aeration. The ozone aeration rate is 5g / min, and the aeration time is For 2 hours, then provide calcium chloride solution through the dosing pump, the concentration of calcium chloride solution in the dosing pump is 50g / L, and the application rate is 60mL / m 2 The injection rate of sediment and calcium chlorid...

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Abstract

The invention discloses a method for the in-situ control of phosphorus release from eutrophic water bottom sediment, which comprises: allowing solution of ozone and calcium chloride to act on an eutrophic water bottom sediment-overlying water interface, so that the calcium chloride can quickly react with phosphorus on the surface interface of lake bottom sediment under a strong oxidizing condition formed by the ozone to reduce the phosphorus content of the overlaying water and form a physical covering layer on the surface of the lake bottom sediment for further inhibiting the phosphorus release from the bottom sediment. Thus, the in-situ control of the phosphorus release from eutrophic lake bottom sediment is realized. Compared with the prior art, the method of the invention has the advantages of convenient operation, low cost and obvious and long-lasting effect. The method can be widely used in water with relatively small flowability such as water in lake and pond. The method represents a new approach for the in-situ remediation of eutrophic water bottom sediment.

Description

(1) Technical field [0001] The invention relates to the field of water environment pollution control, in particular to a method for in-situ control of phosphorus release from nutrient-rich water bottom sediment. (2) Background technology [0002] A large number of studies have shown that phosphorus is the limiting factor of water eutrophication, how to effectively reduce the content of phosphorus in water is one of the keys to the control of eutrophic water. Phosphorus in water can be divided into exogenous phosphorus and endogenous phosphorus according to the source. Exogenous phosphorus includes phosphorus input from various activities such as runoff, atmospheric deposition, industrial and domestic sewage discharge, etc.; endogenous phosphorus refers to phosphorus inside the water body, mainly from the bottom sediment of the water body and the remains of aquatic animals and plants after death. Due to the large content of phosphorus in the sediment of eutrophic water bodie...

Claims

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Application Information

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IPC IPC(8): C02F11/08
Inventor 张杭君贾秀英夏晗婷曹静胡赐明
Owner HANGZHOU NORMAL UNIVERSITY