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A water purification method based on ecological cages

A technology of water purification and cages, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as ineffective effects and inability to control algae, and achieve simple operation and post-processing Low maintenance cost, effect of improving eutrophication status

Inactive Publication Date: 2016-08-24
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The "non-classical biological manipulation" method based on algae control by silver carp and bighead carp can control cyanobacteria, but not all algae, and other algae in water sometimes appear in large numbers; at the same time, nitrogen and phosphorus basically do not leave the water ecological environment after fish eat algae. Therefore, for the treatment of eutrophic water environments such as lakes, rivers, and reservoirs, the effect of reducing nitrogen and phosphorus is not obvious

Method used

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  • A water purification method based on ecological cages
  • A water purification method based on ecological cages

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A polluted lake with a volume of 12000 m 3 , The lake has almost no submerged plants. Water Quality Index: BOD 5 (5-day biochemical oxygen demand) is 11.5 mg / L, phytoplankton biomass is 63.2 mg / L, COD (chemical oxygen demand) is 78.6 mg / L, TN (total nitrogen) is 3.84 mg / L, TP ( Total phosphorus) is 0.37 mg / L, NH 3 -N (ammonia nitrogen) is 2.13 mg / L, and the transparency is 0.33 m. The water purification methods are as follows:

[0029] Cage specification: the mesh area of ​​the side wall of the cage is 0.0001~0.01 m 2 ; The grid area of ​​the compartment is 0.0004~0.0144 m 2 ; The length, width and height of the upper and lower boxes are 1.6 m×1.6 m×1.2 m respectively.

[0030] Take 50 of the above-mentioned cages, fix submerged plants on the bottom of each cage, and put 30-200 plants / m of balsam pear based on the area of ​​the bottom of the cage. 2 , Elodea 4~30 clusters / m 2 (3~6 buds / cluster), after the cages are evenly put into the water area, the total amount of silver ...

Embodiment 2

[0032] A polluted reservoir, water quality index: BOD 5 Is 15.9 mg / L, phytoplankton biomass is 83.5 mg / L, COD is 64.3 mg / L, TN is 3.19 mg / L, TP is 0.29 mg / L, NH 3 -N is 2.46 mg / L, transparency is 0.52 m. The water purification methods are as follows:

[0033] Cage specification: the mesh area of ​​the side wall of the cage is 0.0001~0.01 m 2 ; The grid area of ​​the compartment is 0.0004~0.0144 m 2 ; The length, width and height of the upper and lower boxes are 1.3 m×1.3 m×1.0 m respectively.

[0034] Take 30 of the above cages, and fix submerged plants in the lower box of each cage: Potamogeton crispus 20~200 plants / m 2 , Hydrilla verticillata 5~60 clusters / m 2 (10~15 buds / cluster), after the cages are evenly put into the water, the silver carp and bighead carp are equally divided into the upper box of each cage, so that the total density of silver carp and bighead carp in the water area reaches 100 g / m 3 . BOD is measured every 7 days 5 , Phytoplankton biomass, COD, TN and TP, NH...

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Abstract

The invention discloses a water purification method based on an ecological net cage, using a double-layer net cage as a carrier, stocking filter-feeding fish in the upper box, fixing submerged plants in the lower box, putting the net cage into the water area, and carrying out Water purification. The method of the present invention is based on the comprehensive utilization of the net cage and the water environment ecosystem, without providing additional energy, and the net cage module can be continuously operated only by solar energy and bioenergy in the water environment, and there is no secondary pollution problem. This method can alleviate the algal bloom problem caused by eutrophication of the water body, can effectively reduce the concentration of nitrogen and phosphorus in the water body, requires only a small amount of manual intervention, has the advantages of simple operation and low cost, and is suitable for the ecological environment of lakes, rivers, and reservoirs. governance and improvement.

Description

technical field [0001] The invention belongs to the technical field of water environment treatment of lakes, rivers and reservoirs, in particular to a water purification method based on an ecological cage. Background technique [0002] Cyanobacteria bloom is a phenomenon in which cyanobacteria rapidly proliferate in large numbers in water bodies to form cyanobacteria colonies visible to the naked eye or cause changes in the color of water bodies. The root cause of cyanobacterial blooms is that the water body is enriched with too many nutrients such as nitrogen and phosphorus, so the water bloom is a manifestation of eutrophication in the water body. Cyanobacteria blooms can cause serious shortage of dissolved oxygen in water bodies, decrease in biodiversity, increase of toxic and harmful substances, and exacerbate the deterioration of water quality. [0003] The current methods of controlling cyanobacteria blooms in the water environment have many disadvantages: physical co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
Inventor 吴世凯陈步丹郭亮田学达谢平
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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