The effects of the coagulation-flocculation process using polyaluminium chloride (PAC) and its aids on the removal of organics and nutrient in the combined sewage from Shanghai Zhuyuan First Municipal Wastewater Treat...The effects of the coagulation-flocculation process using polyaluminium chloride (PAC) and its aids on the removal of organics and nutrient in the combined sewage from Shanghai Zhuyuan First Municipal Wastewater Treatment Plant are studied. The coagulant aids include cationic polyacrylamide (PAM), polyvinyl alcohol (PVA), activated silica (AS) and a kind of polyelectrolyte called AN prepared by the authors. The coagulating solution was added to the glass jar holding 1 L wastewater and stirred to a uniform mixture which was stilled to let the supernatant turn out. The supernatant was analyzed to see the removal efficiencies of suspended solid (SS), chemical oxygen demand (COD), soluble chemical oxygen demand (S-COD), total phosphorus (TP) and orthophosphate (PO4 -P). It is found that PAC is efficient in reducing those five matters, PAM, PVA and 3? AN each faciliates the reduction of TP, SS, COD and S-COD and has little contribution to the removal of ammonia nitrigen and orthophosphate, and AS is noneffective at all. The coagulation-flocculation process with PAC has demonstrated applicable to the treatment of combined sewage in Shanghai, and it involves mainly the sweep coagulation mechanism and maybe some more complicated mechanism as well.展开更多
Combining fiber reinforced polymer(FRP)with seawater sea-sand concrete(SSC)can solve the shortage of river sand that will be used for marine engineering construction.The bond performance of BFRP bars and SSC specimens...Combining fiber reinforced polymer(FRP)with seawater sea-sand concrete(SSC)can solve the shortage of river sand that will be used for marine engineering construction.The bond performance of BFRP bars and SSC specimens is researched by pull-out test in this paper.The effects of the parameters,such as bar type,bar diameter,concrete type and stirrup restraint,are considered.It is beneficial to the bonding performance by the reduction of bar diameter.The utilization of seawater sea-sand has a low influence on the bond properties of concrete.The bond strength of BFRP is slightly lower than the steel rebar,but the difference is relatively small.The failure mode of the specimen can be changed and the interfacial bond stress can be improved by stirrups restraint.The bond-slip curves of BFRP ribbed rebar include micro slip stage,slip stage,descent stage and residual stage.The bond stress shows the cycle attenuation pattern of sine in the residual stage.In addition,the bond-slip model of BFRP and SSC is obtained according to the experimental results and related literature,while the predicted curve is also consistent well with the measured curve.展开更多
In order to find out whether long interspersed elements （LINEs） existed in macro-algae gehomes or not, we tested the LINE homologues in representative families （species）： Gracilaria （G. eucheumoides Harv., G. te...In order to find out whether long interspersed elements （LINEs） existed in macro-algae gehomes or not, we tested the LINE homologues in representative families （species）： Gracilaria （G. eucheumoides Harv., G. tenuistipitata Chang et Xia, and G. textorii （Sur） De-Toni）, Laminaria （L. longissima Miyabe and L. japonica Aresch.）, and Ulva （U. lactuca L. and U. pertusa Kjellm.） during 2004 to 2005. Polymerase Chain Reaction （PCR） was carried out with degenerate oligonucleotide primers designed from LINEs of rice homologues and Cin4 of maize. Cloning and nucleotide sequencing of the PCR products revealed that 4 clones that derived from 3 species of Gracilaria have LINE homologues. The nucleotide sequences of the 4 LINE homologues diverged greatly, but the amino acid sequences deduced from them were relatively conserved. The endonuclease regions of the LINE homologues greatly diverged from that of other plants, but they had closer phylogenetic relationship to Zepp elements in Chlorella sp., which indicated that sequence divergence by vertical transmission has been a major influence on the evolution of algal LINEs.展开更多
Polymer-coated mesoporous carbon nanocomposites were prepared from the immobilization of acrylonitrile and acrylic acid copolymers with divinylbenzene as a crosslinker onto a mesoporous carbon framework.High surface a...Polymer-coated mesoporous carbon nanocomposites were prepared from the immobilization of acrylonitrile and acrylic acid copolymers with divinylbenzene as a crosslinker onto a mesoporous carbon framework.High surface areas were maintained after polymerization with accessible porosity.This functional nanocomposite was tested as an adsorbent for uranium from high salinity solutions.Uranium adsorption results have shown that the adsorption capacities are strongly influenced by the density of the amidoxime groups and the specific surface area.展开更多
文摘The effects of the coagulation-flocculation process using polyaluminium chloride (PAC) and its aids on the removal of organics and nutrient in the combined sewage from Shanghai Zhuyuan First Municipal Wastewater Treatment Plant are studied. The coagulant aids include cationic polyacrylamide (PAM), polyvinyl alcohol (PVA), activated silica (AS) and a kind of polyelectrolyte called AN prepared by the authors. The coagulating solution was added to the glass jar holding 1 L wastewater and stirred to a uniform mixture which was stilled to let the supernatant turn out. The supernatant was analyzed to see the removal efficiencies of suspended solid (SS), chemical oxygen demand (COD), soluble chemical oxygen demand (S-COD), total phosphorus (TP) and orthophosphate (PO4 -P). It is found that PAC is efficient in reducing those five matters, PAM, PVA and 3? AN each faciliates the reduction of TP, SS, COD and S-COD and has little contribution to the removal of ammonia nitrigen and orthophosphate, and AS is noneffective at all. The coagulation-flocculation process with PAC has demonstrated applicable to the treatment of combined sewage in Shanghai, and it involves mainly the sweep coagulation mechanism and maybe some more complicated mechanism as well.
基金Project(BE2019642)supported by the Jiangsu Provincial Key Research and Development Program,China。
文摘Combining fiber reinforced polymer(FRP)with seawater sea-sand concrete(SSC)can solve the shortage of river sand that will be used for marine engineering construction.The bond performance of BFRP bars and SSC specimens is researched by pull-out test in this paper.The effects of the parameters,such as bar type,bar diameter,concrete type and stirrup restraint,are considered.It is beneficial to the bonding performance by the reduction of bar diameter.The utilization of seawater sea-sand has a low influence on the bond properties of concrete.The bond strength of BFRP is slightly lower than the steel rebar,but the difference is relatively small.The failure mode of the specimen can be changed and the interfacial bond stress can be improved by stirrups restraint.The bond-slip curves of BFRP ribbed rebar include micro slip stage,slip stage,descent stage and residual stage.The bond stress shows the cycle attenuation pattern of sine in the residual stage.In addition,the bond-slip model of BFRP and SSC is obtained according to the experimental results and related literature,while the predicted curve is also consistent well with the measured curve.
基金Supported by the NSFC (No. 40376049 and No. 30500383)Shandong Agricultural Seed Stock Breeding Project and Knowledge In-novation Program of Chinese Academy of Sciences (KSCX2-YW-N-47-02).
文摘In order to find out whether long interspersed elements （LINEs） existed in macro-algae gehomes or not, we tested the LINE homologues in representative families （species）： Gracilaria （G. eucheumoides Harv., G. tenuistipitata Chang et Xia, and G. textorii （Sur） De-Toni）, Laminaria （L. longissima Miyabe and L. japonica Aresch.）, and Ulva （U. lactuca L. and U. pertusa Kjellm.） during 2004 to 2005. Polymerase Chain Reaction （PCR） was carried out with degenerate oligonucleotide primers designed from LINEs of rice homologues and Cin4 of maize. Cloning and nucleotide sequencing of the PCR products revealed that 4 clones that derived from 3 species of Gracilaria have LINE homologues. The nucleotide sequences of the 4 LINE homologues diverged greatly, but the amino acid sequences deduced from them were relatively conserved. The endonuclease regions of the LINE homologues greatly diverged from that of other plants, but they had closer phylogenetic relationship to Zepp elements in Chlorella sp., which indicated that sequence divergence by vertical transmission has been a major influence on the evolution of algal LINEs.
基金sponsored by the US Department of EnergyOffice of Nuclear Energy+2 种基金under contract DE-AC05-00OR22725 with Oak Ridge National Laboratorymanaged by UT-BattelleLLC
文摘Polymer-coated mesoporous carbon nanocomposites were prepared from the immobilization of acrylonitrile and acrylic acid copolymers with divinylbenzene as a crosslinker onto a mesoporous carbon framework.High surface areas were maintained after polymerization with accessible porosity.This functional nanocomposite was tested as an adsorbent for uranium from high salinity solutions.Uranium adsorption results have shown that the adsorption capacities are strongly influenced by the density of the amidoxime groups and the specific surface area.
