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Method for in situ repairing eutrophication surface water

A technology of eutrophication and in-situ remediation, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of high investment and operating costs of sewage treatment plants, and achieve low cost , the effect is good, the effect of reducing the cost

Inactive Publication Date: 2008-03-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The investment and operation costs of sewage treatment plants are high, and the tail water discharged greatly exceeds the self-purification capacity of natural water bodies
Although domestic sewage and industrial sewage have been treated by sewage treatment plants, the concentration of nitrogen and phosphorus in the treated discharge water still makes the surface water greatly exceed the 6B3838-2002V water standard. How to reduce nitrogen and phosphorus in water is a worldwide problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, utilize the method for in situ repairing eutrophic surface water of yellow-flowered water dragon, carry out the following steps successively:

[0040] 1) Plant pre-cultivation: After washing the yellow-flowered water dragons collected from the wild, they are domesticated and cultivated in a greenhouse using Hoagland's nutrient solution of the international hydroponics standard for 10 days; the temperature of the greenhouse is generally controlled at 20-25°C.

[0041] 2), sewage treatment: first place an octagonal fixed frame that can float on the water surface on the surface of the treated water area, then move the above-mentioned yellow flower water dragon into the octagonal fixed frame, and the yellow flower water dragon just floats on the water surface in the octagonal fixed frame; use the yellow flower water dragon stolon and the root system absorbs excess nitrogen and phosphorus nutrients in the water; place the yellow-flowered water dragon with a fres...

Embodiment 2

[0044] Embodiment 2, utilize the method for in-situ restoration of eutrophic surface water by using the yellow-flowered water dragon, the NH in the treated waters 4 + -N concentration is higher than 0.6mg / L, therefore increase following steps between step 1) and 2) of embodiment 1, all the other are with embodiment 1:

[0045] Pretreatment for reducing ammonia toxicity is carried out in the treated water according to the proportion of nitrifying bacteria with a microbial order of 2.5-4.5 Log MPN (for example, 3.5 Log MPN) per milliliter of water.

Embodiment 3

[0046] Embodiment 3, utilize the method for in-situ restoration of eutrophic surface water by using the yellow-flowered water dragon, the NH in the treated waters 4 + -N concentration is higher than 0.6mg / L, therefore increase following steps between step 2) and 3) of embodiment 1, all the other are with embodiment 1:

[0047] The water spinach is used as the carrier of the floating bed to intercrop water spinach, and water spinach with a fresh weight of 5-10kg is placed in each cubic meter of treated water (the plant height of the water spinach is 12-17cm).

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Abstract

The invention discloses a method for the in situ remediation of eutrophic surface water, which comprises the following steps: 1) The pre-culture of plants is that after the jussiaea stipulacea ohwi collected from fields is purified, the jussiaea stipulacea ohwi is cultivated and domesticated in a green house for nine to eleven days by using the hoagland nutrient solution, which is in accord with the international standard; 2) The sewage treatment is that the cultivated and domesticated jussiaea stipulacea ohwi is transplanted to the surface of the governance water area, and the excessive nutrient salt of nitrogen and phosphor in the water is absorbed by the stolon and root system of the jussiaea stipulacea ohwi; the jussiaea stipulacea ohwi with the fresh weight of five to twenty kilograms is placed on the governance water area per cubic metre. The method of the invention can realize the biological in situ remediation of eutrophic surface water.

Description

technical field [0001] The invention relates to a method for treating eutrophic surface water. Background technique [0002] With the rapid development of the city, the corresponding sewage treatment technology has not adapted to it; resulting in serious pollution of the urban water environment and deteriorating water quality. The sewage discharge standard of urban sewage treatment plant GB18918-2002 total nitrogen discharge standard A and B standards are 15 and 20 mg / L, and the total phosphorus A and B standards are 1.0 and 1.5 mg / L, far exceeding GB3838-2002 V water Standards for total nitrogen 2.0mg / L, total phosphorus 0.4mg / L for rivers, and 0.2mg / L for lakes and reservoirs. The existing secondary treatment of sewage does little to remove N and P, and the treated tail water discharge, rainwater runoff, sediment, etc. will become the main cause of polluting the water environment. The input of N, P and other nutrient elements and the dissolved oxygen status have a great ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
Inventor 杨肖娥吴湘方云英蔡景波
Owner ZHEJIANG UNIV
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