A process of biosorption of Cu^2＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardl...A process of biosorption of Cu^2＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models： the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass, The results show that both the Ritchie second-order and modified secondorder equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu^2＋ and Zn^2＋ on B. subtilis. The experimental data points of adsorption Cd^2＋ and Zn^2＋ on B. subtilis are described by Freundlich isotherms model.展开更多
【目的】探明贝类养殖活动的固碳增汇潜力。【方法】以枸杞岛筏式养殖厚壳贻贝为研究对象,调查了其生长特征与附着动物群落特征的季节变化及其与环境因子的相关性,并基于养殖贝类及附着动物的生物量碳密度,测定评估了厚壳贻贝及其附着...【目的】探明贝类养殖活动的固碳增汇潜力。【方法】以枸杞岛筏式养殖厚壳贻贝为研究对象,调查了其生长特征与附着动物群落特征的季节变化及其与环境因子的相关性,并基于养殖贝类及附着动物的生物量碳密度,测定评估了厚壳贻贝及其附着动物的可移出碳汇量。【结果】厚壳贻贝软组织含水率、肥满度和性腺指数存在明显的季节、年龄和区域差异,其中软组织含水率具体表现为春>冬>秋>夏,1龄>2龄+,养殖区中部>近岸和远岸,与肥满度和性腺指数呈现出相反的趋势,且性腺指数呈现出4龄>3龄>2龄>1龄的规律;厚壳贻贝壳/软组织含碳率、软组织湿重比均存在显著的季节差异,RDA分析表明,软组织含水率和氨氮二者呈现较强正相关关系,软组织含碳率、肥满度和性腺指数与叶绿素a、温度和总氮等环境因子呈现较强正相关关系;附着动物丰度和生物量存在较大的季节差异,其中春季生物量最高,主要物种为绿侧花海葵、网纹纹藤壶、带偏顶蛤、缪氏哲蟹、短毛海鳞虫等;厚壳贻贝生物量碳密度秋季最高,为129.98 g C/kg,春季最低,为108.29 g C/kg,附着动物生物量碳密度春季最高,为6.85 g C/kg,夏季最低,为1.38 g C/kg。【结论】通过收获贻贝和附着动物,综合可移出生物量碳密度最高可达135.34 g C/kg,估算2021年枸杞岛贻贝养殖可收获约3.02×10^(4) t C,综合可产生的碳汇经济价值约为1049万元。研究结果对于最大化提高厚壳贻贝养殖的可移出碳汇能力,以及深入认识和科学评估贝类养殖的碳汇效应具有重要的理论依据和现实意义。展开更多
基金Supported by National Natural Science Foundation of China (No. 20206024)
文摘A process of biosorption of Cu^2＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast, The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models： the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass, The results show that both the Ritchie second-order and modified secondorder equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu^2＋ and Zn^2＋ on B. subtilis. The experimental data points of adsorption Cd^2＋ and Zn^2＋ on B. subtilis are described by Freundlich isotherms model.
文摘【目的】探明贝类养殖活动的固碳增汇潜力。【方法】以枸杞岛筏式养殖厚壳贻贝为研究对象,调查了其生长特征与附着动物群落特征的季节变化及其与环境因子的相关性,并基于养殖贝类及附着动物的生物量碳密度,测定评估了厚壳贻贝及其附着动物的可移出碳汇量。【结果】厚壳贻贝软组织含水率、肥满度和性腺指数存在明显的季节、年龄和区域差异,其中软组织含水率具体表现为春>冬>秋>夏,1龄>2龄+,养殖区中部>近岸和远岸,与肥满度和性腺指数呈现出相反的趋势,且性腺指数呈现出4龄>3龄>2龄>1龄的规律;厚壳贻贝壳/软组织含碳率、软组织湿重比均存在显著的季节差异,RDA分析表明,软组织含水率和氨氮二者呈现较强正相关关系,软组织含碳率、肥满度和性腺指数与叶绿素a、温度和总氮等环境因子呈现较强正相关关系;附着动物丰度和生物量存在较大的季节差异,其中春季生物量最高,主要物种为绿侧花海葵、网纹纹藤壶、带偏顶蛤、缪氏哲蟹、短毛海鳞虫等;厚壳贻贝生物量碳密度秋季最高,为129.98 g C/kg,春季最低,为108.29 g C/kg,附着动物生物量碳密度春季最高,为6.85 g C/kg,夏季最低,为1.38 g C/kg。【结论】通过收获贻贝和附着动物,综合可移出生物量碳密度最高可达135.34 g C/kg,估算2021年枸杞岛贻贝养殖可收获约3.02×10^(4) t C,综合可产生的碳汇经济价值约为1049万元。研究结果对于最大化提高厚壳贻贝养殖的可移出碳汇能力,以及深入认识和科学评估贝类养殖的碳汇效应具有重要的理论依据和现实意义。
