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
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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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