Preparation method and application of eutrophic lake sediment phosphorous adsorbent
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A technology of eutrophication and phosphorus adsorbent, applied in chemical instruments and methods, adsorption water/sewage treatment, polluted waterway/lake/pond/river treatment, etc., can solve river bed sediment suspension and secondary pollution Sediment ecosystem, impact on water environment quality and other issues, achieve good environmental and economic benefits, control endogenous phosphorus pollution, and improve water transparency
Pending Publication Date: 2018-08-14
INST OF AQUATIC LIFE ACAD SINICA
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[0003] Sediment dredging can effectively remove polluted sediment, but there are disadvantages such as high cost, secondary pollution, and damage to the original sediment ecosystem of the river. Especially the treatment, disposal and resource utilization of dredged sediment are important technologies for sediment treatment. bottleneck
The dilution capacity of water diversion to clean up pollutants will be significantly increased, and the change of hydrodynamic conditions will accelerate the mixing of pollutants, which will improve the purification capacity of local waters, but the transfer of pollutants in water bodies will affect the water environment quality of other waters; if the water body The faster the flow rate, it is easy to cause the sediment of the river bed to float and cause secondary pollution of the water body
The discharge method of deep water can increase the output of endogenous phosphorus, but the investment is large and the disturbance to the sediment is large, and it is easy to cause the sediment to rise and cause the release of endogenous phosphorus
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Embodiment 1
[0025] A kind of preparation method of eutrophic lake sediment phosphorus adsorbent, its steps are:
[0026] 1) Immerse the preferred clay mineral in a hydrochloric acid solution (5% by mass), heat and stir in a water bath for 2 hours, control the temperature at 30 or 35 or 40 or 46 or 50° C., and wash until it is neutral (pH=7); obtain a Acid-modified clay minerals;
[0027] 2) Immerse the acid-modified clay mineral obtained in step 1) into a sodium carbonate solution (mass fraction 10%), heat and stir in a water bath for 1 h, control the temperature at 50 or 55 or 61 or 64 or 70 ° C, and wash with distilled water until It is neutral (pH=7), baked at 150°C for 2h. Obtain an acid / salt composite modified clay mineral;
[0028] 3) Put the acid / salt composite modified clay mineral obtained in step 2) into a muffle furnace and roast at 400°C for 1 hour, then cool to room temperature (25°C) to obtain a eutrophic lake sediment phosphorus Adsorbent, spare.
[0029] The clay miner...
Embodiment 2
[0032] The application of a kind of eutrophic lake sediment phosphorus adsorbent in the ecological restoration project of lake endogenous phosphorus control, its steps are:
[0033] 1) Set densely woven bamboo sticks with a height of 20cm in the restoration area of the West Lake in Hangzhou to prevent the diffusion and loss of the improved matrix;
[0034] 2) Sprinkle the adsorbent evenly on the water surface of the eutrophic lake into the bottom with a thickness of 5cm.
[0035] 3) Plant aquatic plants in the covered area.
[0036] Described aquatic plant is bitter grass.
[0037] After 6 months of planting, the survival rate of Erythrina fragrans reached 90%, 70% of the planting area was covered by aquatic plants, and the removal rate of total phosphorus in the bottom mud surface (0-10cm) of the lake restoration area reached 55%.
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Abstract
The invention discloses a preparation method and application of a eutrophic lake sediment phosphorous adsorbent. The preparation method comprises the following steps: 1) immersing clay minerals into ahydrochloric acid solution and heating and stirring in a water bath; controlling the temperature in a certain range and washing until the solution is neutral; 2) immersing into a sodium carbonate solution; heating and stirring in the water bath; controlling the temperature in a certain range and washing with distilled water until the solution is neutral; drying for a certain time in a certain drying range; 3) roasting in a muffle furnace for a certain time under the condition that the temperature is 350 to 450 DEG C; cooling to room temperature to obtain the eutrophic lake sediment phosphorous adsorbent. The invention also provides application of the adsorbent in lake endogenous phosphorous controlled ecological rehabilitation engineering. The adsorbent disclosed by the invention is low in cost, environmentally friendly and good in adsorbent effect, and contains various macro-elements and microelements which are beneficial to the growth and development of organisms; the adsorbent is good for field planting and propagation of water plants and stabilization of a water environment; efficient phosphorous removal of eutrophic lake sediment can be realized, and the endogenous phosphorous pollution problem of a eutrophic lake is effectively controlled.
Description
technical field [0001] The invention belongs to the technical field of lake restoration engineering, and more specifically relates to a preparation method of a eutrophic lake sediment phosphorus adsorbent, and also relates to a use of a eutrophic lake sediment phosphorus adsorbent, which can be widely used in eutrophication Ecological restoration project for the control of endogenous phosphorus in lakes. Background technique [0002] Eutrophication of water body has become a global water environment pollution problem. Phosphorus is the key to water body eutrophication because of its nutrient limitation in water ecosystem. After the exogenous phosphorus input is controlled, the endogenous phosphorus in the sediment will be released to the overlying water body under certain conditions, and continue to maintain the nutrient requirements of aquatic organisms, which is not conducive to the ecological restoration of the water body. At present, the control technologies for endogen...
Claims
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