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Ecological net cage-based water purification method

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

Active Publication Date: 2014-08-27
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • 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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  • Ecological net cage-based water purification method
  • Ecological net cage-based water purification method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A polluted lake with a water volume of 12000 m 3 , the lake has almost no submerged plants. Water quality index: BOD 5 (5-day biochemical oxygen demand) was 11.5 mg / L, phytoplankton biomass was 63.2 mg / L, COD (chemical oxygen demand) was 78.6 mg / L, TN (total nitrogen) was 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. Water purification methods are as follows:

[0029] Cage specifications: the grid area of ​​the side wall of the cage is 0.0001 ~ 0.01 m 2 ; The grid area of ​​the interlayer 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 bitter grass based on the bottom area of ​​the cages. 2 , Elodea 4~30 clumps / m 2 (3-6 buds / cluster), after the net cages were evenly put into the waters, the total amou...

Embodiment 2

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

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

[0034] Take 30 of the above-mentioned cages, and fix submerged plants in the lower boxes of each cage: 20-200 plants / m 2 , 5-60 clusters / m of Hydrilla verticillium 2 (10-15 buds / cluster), after the net cages are evenly put into the water area, the silver carp and bighead carp are evenly divided into the upper box of each net cage, so that the total density of silver carp and bighead carp in the water area reaches 100 g / m 3 . Measure BOD every 7 days 5 , phytoplankton biomass, COD, TN an...

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Abstract

The invention discloses an ecological net cage-based water purification method; a double-layer net cage is used as a carrier; filter-feeder fish is fed in the upper-layer cage; submerged plants are fixed in the lower-layer cage; the net cage is put into a water area for water purification. The method of the invention is based on the net cage and the comprehensive utilization of water environment ecological systems; no additional energy is necessary; only solar energy and biological energy in the water environment are used to maintain the operation of the net cage module; and no secondary pollution problem is generated. The method can relieve the water bloom problem caused by water eutrophication, can effectively decrease nitrogen and phosphorus concentrations of water body, needs little manual intervention, has the advantages of simple operation and low cost, and is suitable for ecological management and improvement of water of lakes, rivers, reservoirs.

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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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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