A synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals was applied in the purification of the wastewater discharged from a Tnonyx sinensis breeding greenhouse, and the removal effe...A synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals was applied in the purification of the wastewater discharged from a Tnonyx sinensis breeding greenhouse, and the removal effects of TN, NH4+ -N, TP and COD in the wastewater were analyzed. The results show that after the breeding wastewater was purified by the synthetic biological pond for about five months, TN, NH~ -N, TP and COD concentration in the breeding wastewater were reduced by 78%, 92%, 81% and 60% respectively, while DO content in the breeding wastewater increased by about four times, and there was no obvious change in water pH; previous yellow or brown and turbid sewage became yel- lowish and slightly turbid, and it had no smell. It is obviously seen that the purification effect of T. sinensis breeding wastewater by the synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals is obvious, and the synthetic biological pond has good promotion and application prospects.展开更多
[Objective] The control effect of floating plants constructed wetland to nitrogen and phosphorus pollution from rice field drainage was studied.[Method] Firstly,the characteristic of floating plants and the purificati...[Objective] The control effect of floating plants constructed wetland to nitrogen and phosphorus pollution from rice field drainage was studied.[Method] Firstly,the characteristic of floating plants and the purification principle of pollutants were introduced,and then purification effect was analyzed through controlling nitrogen and phosphorus pollution from rice field drainage by floating plants constructed wetland.[Result] By means of floating plants constructed wetland,the average removal rate of total nitrogen(TN) from double-season early and late rice field drainage reached 52.17% and 62.23%,respectively,while that of total phosphorus(TP) was 45.69% and 74.37%,respectively,with better removal effect.Meanwhile,floating plants have ecological and ornamental value to some extent.[Conclusion] Floating plants constructed wetland could not only control nitrogen and phosphorus pollution in field drainage effectively but also keep farmland ecosystem in healthy state.展开更多
[ Objective] The aim was to provide scientific basis for purifying water quality, ecological restoration and fishery breeding of GaoBaZhou reservoir multiplication and stocking. [ Method] Monitoring of normal water ph...[ Objective] The aim was to provide scientific basis for purifying water quality, ecological restoration and fishery breeding of GaoBaZhou reservoir multiplication and stocking. [ Method] Monitoring of normal water physical, chemical characteristics and different number of data of GaoBaZhou reservoir was conducted in 2010 and 2011 after different amount of filter-feeding fishes stocking in this reservoir. [ Result] The water physical and chemical factors TN, NO2, NO3-N-N, TP and COD, Chl. a in 2011 were significantly less than 2010, 2011 month average 1.389 mg/L, 0.039 6 rng/L, 1.211 7 mg/L, 0.137 3 mg/L, 16.191 mg/L, 10.226 8 mg/m3, 2010 month average 1.659 mg/L, 0.066 2 mg/L, 1.472 9 mg/L, 0.099 9 rag/L, 18.314 8 mg/L, 14.917 8 mg/L. The calculation results of TSIM showed that 2011 reservoir eutrophication TSIM were less than 2010, up to 53.78 and 57.36. E Coaclusion: The whole reservoir area revealed mild eutrophication (the TSIM 〉 53), and it suggested that the filterfeeding fishes amount could be increased in the reservoir.展开更多
[Objectives]To provide a theoretical basis for constructing the best species suitable for local shrimp-bivalves-algae IMTA through the screening of different bivalves and the determination of seaweed density.[Methods]...[Objectives]To provide a theoretical basis for constructing the best species suitable for local shrimp-bivalves-algae IMTA through the screening of different bivalves and the determination of seaweed density.[Methods]The preliminary studies of different kind of bivalves and macroalgae(Gracilaria lichevoides)used for the purification of shrimp effluent were described.Through the screening of benthic bivalves,the best ratio of integrated culture of bivalves and algae was determined.[Results]Both bivalves and macroalgae had certain purification effects on aquaculture wastewater,but the effects significantly differed from species and breeding density.The removal rate of nutrient declined from Potamocorbula laevis,Sinonovacula constricta,Tegillarca granosa.The mixotrophic culture of 8 ind/L P.laevis and 120 g G.lichevoides had the highest efficiency of purification and removal rates of nutrient:NH4-N:90.67%,TP:86.18%,TN:72.66%,NO3-N:51.85%,respectively.There was a significant difference between the blank control group and the other three groups(P<0.01).The 8 ind/L+120 g group was significantly higher than the 4 ind/L+120 g group(P<0.05)in TP removal rate.Additionally,the difference between four groups was significant in the removal rate of NH4-N and TN(P<0.05),but 2 ind/L+120 g group and 8 ind/L+120 g group in the removal rate of NO3-N had no significant difference(P>0.05).[Conclusions]This research provides a reference for the use of filterable shellfish and large seaweed to treat aquaculture wastewater,and also provides the theoretical basis for constructing the local multi-level breeding structure.展开更多
In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode connections of ta...In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode connections of tantalum and the corresponding rods of metallic lanthanum were designed,the temperature distributions of three kinds of rod were measured,and the influence of temperature difference on the purification effect of solid-state electrotransport was investigated.The results indicate that the maximum temperature difference of the rod will be significantly reduced through decreasing the cross section of electrode connection to make its unit length resistance close to that of rod,or increasing the unit length resistance of the section at both ends of the rod.When these two measures are adopted at the same time,the effect of decreasing rod temperature difference is the best in the present study,and the maximum temperature difference of the rod can be reduced to 29℃when the maximum temperature of the rod is 820℃.The migration velocity of the impurities at rod ends can be obviously improved after the rod temperature difference is reduced,which enables the purification effect and efficiency of solid-state electrotransport to be greatly raised;it is also found that the major impurities iron in metallic lanthanum migrates more easily than oxygen and carbon during the purification of metal lanthanum with solid-state electrotransport.展开更多
Patients with acute infectious respiratory illness may emit bio‐aerosols containing pathogens to infect susceptible hosts,including other patients and healthcare workers.This study aimed to design the pediatric isola...Patients with acute infectious respiratory illness may emit bio‐aerosols containing pathogens to infect susceptible hosts,including other patients and healthcare workers.This study aimed to design the pediatric isolation(PI)bed and evaluate its purification effect on aerosols and microorganisms in the air in experiment rooms and verify the general wards'purification efficiency.The PI bed is connected to a purification device that surrounds the child's head to prevent contaminants'spread into the room.We test the purification effect of the PI bed in the experiment room and verified the purification effect of the PI bed in the hospital.The results showed that PI beds in the demonstration ward presented purifying effects on both smoke particulates and microorganisms like Staphylococcus albus(S.albus)and H1N1 virus.The Aerosol in the room in the hospital was then detected to validity the purification rate.Therefore,Isolation beds could be used in hospitals to reduce the risk of nosocomial infection to protect the health of doctors,patients,and visitors.展开更多
基金Supported by the Project of Public Welfare Application Research from Huzhou Science and Technology Bureau(2013C102070)
文摘A synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals was applied in the purification of the wastewater discharged from a Tnonyx sinensis breeding greenhouse, and the removal effects of TN, NH4+ -N, TP and COD in the wastewater were analyzed. The results show that after the breeding wastewater was purified by the synthetic biological pond for about five months, TN, NH~ -N, TP and COD concentration in the breeding wastewater were reduced by 78%, 92%, 81% and 60% respectively, while DO content in the breeding wastewater increased by about four times, and there was no obvious change in water pH; previous yellow or brown and turbid sewage became yel- lowish and slightly turbid, and it had no smell. It is obviously seen that the purification effect of T. sinensis breeding wastewater by the synthetic biological pond composed of aquatic plants, a microorganism and aquatic animals is obvious, and the synthetic biological pond has good promotion and application prospects.
基金Supported by Natural Science Foundation of Guangxi Province(0991026)Foundation of Guangxi Key Laboratory of Environmental Engineering and Protection Assessment(0701K019)+1 种基金Project of Environmental Engineering Innovation Team of Talent Small Upland Construction in Universities in Guangxi([2007]Number71)InnovationProgram Project of Postgraduate Education in Guangxi Province(2009105960815M25)~~
文摘[Objective] The control effect of floating plants constructed wetland to nitrogen and phosphorus pollution from rice field drainage was studied.[Method] Firstly,the characteristic of floating plants and the purification principle of pollutants were introduced,and then purification effect was analyzed through controlling nitrogen and phosphorus pollution from rice field drainage by floating plants constructed wetland.[Result] By means of floating plants constructed wetland,the average removal rate of total nitrogen(TN) from double-season early and late rice field drainage reached 52.17% and 62.23%,respectively,while that of total phosphorus(TP) was 45.69% and 74.37%,respectively,with better removal effect.Meanwhile,floating plants have ecological and ornamental value to some extent.[Conclusion] Floating plants constructed wetland could not only control nitrogen and phosphorus pollution in field drainage effectively but also keep farmland ecosystem in healthy state.
基金funded by the National Public Welfare(Agriculture)Special Research(200903048-09)
文摘[ Objective] The aim was to provide scientific basis for purifying water quality, ecological restoration and fishery breeding of GaoBaZhou reservoir multiplication and stocking. [ Method] Monitoring of normal water physical, chemical characteristics and different number of data of GaoBaZhou reservoir was conducted in 2010 and 2011 after different amount of filter-feeding fishes stocking in this reservoir. [ Result] The water physical and chemical factors TN, NO2, NO3-N-N, TP and COD, Chl. a in 2011 were significantly less than 2010, 2011 month average 1.389 mg/L, 0.039 6 rng/L, 1.211 7 mg/L, 0.137 3 mg/L, 16.191 mg/L, 10.226 8 mg/m3, 2010 month average 1.659 mg/L, 0.066 2 mg/L, 1.472 9 mg/L, 0.099 9 rag/L, 18.314 8 mg/L, 14.917 8 mg/L. The calculation results of TSIM showed that 2011 reservoir eutrophication TSIM were less than 2010, up to 53.78 and 57.36. E Coaclusion: The whole reservoir area revealed mild eutrophication (the TSIM 〉 53), and it suggested that the filterfeeding fishes amount could be increased in the reservoir.
基金Ningbo Science and Technology Project of Enriching the People in 2015(2015C10008)Ningbo Science and Technology Plan Project(2019C10039)+1 种基金Zhejiang Science and Technology Plan Project(2019C02054)Special Project for the Construction of Modern Agricultural Industrial Technology System(CARS-49).
文摘[Objectives]To provide a theoretical basis for constructing the best species suitable for local shrimp-bivalves-algae IMTA through the screening of different bivalves and the determination of seaweed density.[Methods]The preliminary studies of different kind of bivalves and macroalgae(Gracilaria lichevoides)used for the purification of shrimp effluent were described.Through the screening of benthic bivalves,the best ratio of integrated culture of bivalves and algae was determined.[Results]Both bivalves and macroalgae had certain purification effects on aquaculture wastewater,but the effects significantly differed from species and breeding density.The removal rate of nutrient declined from Potamocorbula laevis,Sinonovacula constricta,Tegillarca granosa.The mixotrophic culture of 8 ind/L P.laevis and 120 g G.lichevoides had the highest efficiency of purification and removal rates of nutrient:NH4-N:90.67%,TP:86.18%,TN:72.66%,NO3-N:51.85%,respectively.There was a significant difference between the blank control group and the other three groups(P<0.01).The 8 ind/L+120 g group was significantly higher than the 4 ind/L+120 g group(P<0.05)in TP removal rate.Additionally,the difference between four groups was significant in the removal rate of NH4-N and TN(P<0.05),but 2 ind/L+120 g group and 8 ind/L+120 g group in the removal rate of NO3-N had no significant difference(P>0.05).[Conclusions]This research provides a reference for the use of filterable shellfish and large seaweed to treat aquaculture wastewater,and also provides the theoretical basis for constructing the local multi-level breeding structure.
基金financially supported by the National Basic Research Program of China(No.2012CBA01207)the National High Technology Research and Development Program of China(No.2011AA03A409)。
文摘In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode connections of tantalum and the corresponding rods of metallic lanthanum were designed,the temperature distributions of three kinds of rod were measured,and the influence of temperature difference on the purification effect of solid-state electrotransport was investigated.The results indicate that the maximum temperature difference of the rod will be significantly reduced through decreasing the cross section of electrode connection to make its unit length resistance close to that of rod,or increasing the unit length resistance of the section at both ends of the rod.When these two measures are adopted at the same time,the effect of decreasing rod temperature difference is the best in the present study,and the maximum temperature difference of the rod can be reduced to 29℃when the maximum temperature of the rod is 820℃.The migration velocity of the impurities at rod ends can be obviously improved after the rod temperature difference is reduced,which enables the purification effect and efficiency of solid-state electrotransport to be greatly raised;it is also found that the major impurities iron in metallic lanthanum migrates more easily than oxygen and carbon during the purification of metal lanthanum with solid-state electrotransport.
基金supported by grants from the National Key Research and Development Program of China(2018YFC1200100,2018YFC1200103)Scientific Research Project of Guangdong Province Traditional Chinese Medicine Bureau(20201191)+4 种基金Innovative and Strong School Project of Guangdong Provincial Department of Education(2020KZDZX1122)Foshan Science and Technology Innovation Project(2020001000416)Nanhai District Talent Plan(201905290008)Emergency Projects of Guangzhou Laboratory of Breathing Diseases and Emergent Public Health Events(EKPG21‐13)Special Project on key scientific research of COVID‐19 prevention and control in Guangzhou(202008070003).
文摘Patients with acute infectious respiratory illness may emit bio‐aerosols containing pathogens to infect susceptible hosts,including other patients and healthcare workers.This study aimed to design the pediatric isolation(PI)bed and evaluate its purification effect on aerosols and microorganisms in the air in experiment rooms and verify the general wards'purification efficiency.The PI bed is connected to a purification device that surrounds the child's head to prevent contaminants'spread into the room.We test the purification effect of the PI bed in the experiment room and verified the purification effect of the PI bed in the hospital.The results showed that PI beds in the demonstration ward presented purifying effects on both smoke particulates and microorganisms like Staphylococcus albus(S.albus)and H1N1 virus.The Aerosol in the room in the hospital was then detected to validity the purification rate.Therefore,Isolation beds could be used in hospitals to reduce the risk of nosocomial infection to protect the health of doctors,patients,and visitors.