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Study on Gracilaria Lemaneaformis’s Ability to Treat Mariculture Discharge

Author: ZhaoXianTing
Tutor: BaoZhenMin；QuKeMing
School: Ocean University of China
Course: Ecology
Keywords: Tony algal polyculture Asparagus Aquaculture wastewater Bioremediation
CLC: X714
Type: Master's thesis
Year: 2007
Downloads: 216
Quote: 0
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Abstract


Asparagus processing mariculture wastewater experimental study, experimental results, asparagus and Ulva pertusa the removal of nutrients, asparagus processing aquaculture wastewater aquaculture wastewater asparagus growth effect, asparagus and Pacific oyster polyculture experimental results as well as shellfish algae polyculture aquaculture wastewater treatment turbot experimental results and conclusions are as follows: 1) asparagus over the Ulva pertusa more suitable used as Tony algae mixed raising its 24 hours for ammonia and nitrate removal rate reached 90.32% and 60.45%, respectively, far better than the removal of Ulva pertusa. 2) nutrient factors and environmental factors asparagus nitrogen, phosphorus absorption rate, when the water temperature is 22 ° C, the concentration of dissolved inorganic nitrogen (DIN) 50umol / l, asparagus obtain nitrogen absorption rate, when the water temperature is 25 ° C, the concentration of dissolved inorganic phosphorus (DIP) 3.1umol / l, asparagus can achieve the maximum rate of absorption of phosphorus, but high water temperature and nutrient concentrations also inhibit asparagus vegetables absorb nutrients; under in 3000lx light intensity asparagus maximum absorption rate of nitrogen salts under in 2000lx light intensity asparagus maximum absorption rate of phosphorus salt, high light intensity inhibits asparagus nutrients absorption. 3) asparagus by the growth in aquaculture wastewater nutrient concentrations in DIN concentration for 20-50umol / l range, asparagus grow well, especially when 30umol / l, the growth rate reached the highest value; the DIN concentration exceeds 150umol / l, the growth of algae is inhibited, particularly in achieving 250umol / l, algae almost stopped growing. DIP concentrations of 1-10umol / l range, the rapid growth of asparagus, when the the TIP concentration of 20umol / l, inhibited the growth of algae. 4) oyster density 3 / m ~ 2, the density of the asparagus 50g / m2 Tony algae ratio mode polyculture is the best; the polyculture system under the conditions of 25 ° C, oysters for particulate matter filter feeders adsorption of nutrients and asparagus are more significant when the water temperature exceeds 28 ° C, oysters and asparagus delayed adsorption filter feeders for the suspended particles and nutrients to make the water reach the eutrophic. 5) the asparagus and Pacific oysters as a biological filter treatment effect mariculture wastewater Tony algal polyculture reduce nutrient concentrations and suspended particles in the wastewater content, making aquaculture wastewater discharged into the sea before marine water quality up to second-class standards which are unlikely to cause pollution of the sea and the destruction of the marine environment, and the easy availability and the economic effects of the aquaculture output (biomass increase) in two aquatic organisms Tony algal polyculture integrated cost reduction. However, Tony algal polyculture highly vulnerable to the impact of the external environment, such as temperature or light intensity is too high, the asparagus will slow down the absorption of nutrients in the water, reduced photosynthesis to make oxygen production to reduce lead to oyster breathing difficulties, growth blocked, broken ring Tony algal polyculture mutually beneficial mechanism is not conducive to the wastewater treatment, Tony algal polyculture system whether perennial continued operation yet to be further explored, especially in the high temperature in summer days.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Processing and comprehensive utilization of agricultural waste > Aquaculture
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