The Applied Research Of Nano-ecobase In Aquaculture

In recent years, aquaculture gradually developed from extensive breeding to intensive farming along with water pollution aggravating. The metabolites,?residual diets and debris produced from the breeding plants are the main pollution sources of water quality in the intensive farming.?Water treatment technology becomes the key to success for breeding.? Water treatment technologies in factory breeding include physics filtration,?bio-filter,?temperature control,?sterilization and oxygen increasing suck links.?While bio-filter in which plays an important role is the core of aquaculture wastewater treatment.?The removal of NH3-N and NO2-N mainly relies on bio-filter, and the operating conditions of bio-filter decides the treatment effect for aquaculture wastewater. The biological filter material (biofilms) as the biofilm carrier and its best operation conditions, is the core of this technology.This experiment studies the application of Nano-ecobase in aquaculture from indoor experiment and production experiment. Indoor experiment: This experiment studied the effect of Nano-ecobase on treatment of aquaculture wastewater under different temperature, oxygen and hydraulic retention time,?determined the biological filter start-up time and the optimal operating conditions. Production experiment: Through the application research of Nano-ecobase in Litopenaeus vannamei culture systems,the experiment analyzed its role in improving water quality and promoting the growth of L vannamei, and drawed the optimum density of Nano-ecobase.1. Study on the effect of Nano-ecobase on treatment of aquaculture wastewaterThis experiment studied treatment efficiency of aquaculture wastewater and determined the optimal conditions by biofilter which were filled with Nano-ecobase operated at different parameters-temperature, dissolved oxygen (DO) and hydraulic retention time (HRT), by orthogonal experiment of three factors and four levels.The results indicated that the start-up of biofilter which was filled with aquaculture wastewater containing high concentration of NH3-N, NO2-N needed about 22 days. Nano-ecobase has obvious effect for the removal of NH3-N,the removal rate was 93.5%. The influence of the removal rate of NH3-N was that HRT>Temperature>DO. The optimum condition of removing NH3-N was that the temperature was 30℃, DO was 5.43mg/L, HRT was 0.33h, while the removal rate was 94.6%.The removal rate of Nano-ecobase for NO2-N was 69.3%. The influence of the removal rate of NO2-N was that HRT>DO>Temperature. The optimum condition of removing NO2-N was that the temperature was 21℃, DO was 6.40mg/L, HRT was 0.33h, while the removal rate was 71.5%. The removal rate of Nano-ecobase for P was 40.9%. The influence of the removal rate of P was that Temperature>HRT>DO. The optimum condition of removing P was that the temperature was 30℃, DO was 5.43mg/L, HRT was 0.33h, while the removal rate was 44.1%.2. Application research of Nano-ecobase in L vannamei culture systemsThe Nano-ecobase was hung with different density of 0.029 m²/m³,0.043 m²/m³,0.058m²/m³ in 12 seawater ponds,?compared to the pond without Nano-ecobase.The experiment demonstrated the effect of Nano-ecobase for aquaculture water quality and the yield of L vannamei. It shows that Nano-ecobase can not only reduced the contents of NH₃-N,NO₂-N,P and COD,?still can increase the yield of L vannamei.The experiment finally arrived that the optimum density of Nano-ecobase was 0.043 m²/m³, when the shrimp density was 150wei/m³.