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131.
从传质和生化反应基本过程出发,经合理简化,将复杂的生物填料塔中三相传质生化反应过程综合为一个有效生化反应过程并得到其数学模型。模型中综合参数——总传质有效因数η可通过容易测定的本征反应和实际反应速率来确定;实验研究了不同入塔污水CODCr和入塔水量对η的影响。结果表明:入塔污水CODCr较高时,有较大的孕;当入塔水量增大,传质效果增加η增大。 相似文献
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133.
梅雨期持续性强降水是江淮地区重要的灾害天气,往往给降水地区带来巨大的生命与经济损失。2016年7月1—7日,南京地区经历了一场历时7 d的典型梅雨降雨过程,本文针对此次降水事件的大气水汽稳定同位素变化特征及其成因进行相关研究。研究发现:水汽稳定同位素的变化特征与大尺度有组织对流活动和大气环流有良好的对应关系。水汽稳定同位素随时间分别呈现δ18O的“U型”演化和过量氘的波动变化,二者在不同降雨阶段的演化特征可以指示产生降雨的天气系统的移动与切换,其中水汽过量氘随时间变化的极大值和极小值转折点分别反映了低涡系统开始与结束影响研究区、冷切变线消散、槽线过境以及台风外围水汽抵达研究区的时间。结果表明:多个天气系统连续作用于研究区及其带来的不同水汽源的持续供给,是此次梅雨期降水持续维持的重要条件。 相似文献
134.
Environment, Development and Sustainability - The resource and environmental carrying capacity (RECC) is an important foundation and support for a city or region, and determines the direction of... 相似文献
135.
Luisito Bertinelli Luca Marchiori Amer Tabakovic Benteng Zou 《Environmental Modeling and Assessment》2018,23(1):25-37
To reach a common target of environmental quality, countries can choose to commit to a stream of pollution abatement right from the beginning of the game or decide upon abatement at each moment of time. Though most of the previous literature studies homogeneous strategies where no country or all countries commit to a (same) predefined policy, reality goes along a different way: some countries make more efforts than others to reduce pollutant emission. The main novelty of this paper resides in the introduction of this kind of heterogeneous strategic behavior currently observed among large pollution nations. We find that the pollution level can be lower under heterogeneous than under homogeneous strategies. A stringent environmental quality target will induce the committed player to produce an abatement effort that more than compensates the free-riding attitude of the non-committed player. 相似文献
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137.
There is increasing concern that agricultural intensification in China has greatly increased N2O emissions due to rapidly increased fertilizer use. By linking a spatial database of precipitation, synthetic fertilizer N input, cropping rotation and area via GIS, a precipitation-rectified emission factor of N2O for upland croplands and water regime-specific emission factors for irrigated rice paddies were adopted to estimate annual synthetic fertilizer N-induced direct N2O emissions (FIE-N2O) from Chinese croplands during 1980-2000. Annual FIE-N2O was estimated to be 115.7 Gg N2O-N year−1 in the 1980s and 210.5 Gg N2O-N year−1 in the 1990s, with an annual increasing rate of 9.14 Gg N2O-N year−1 over the period 1980-2000. Upland croplands contributed most to the national total of FIE-N2O, accounting for 79% in 1980 and 92% in 2000. Approximately 65% of the FIE-N2O emitted in eastern and southern central China. 相似文献
138.
Yun Kong Pei Zou Lihong Miao Jiaoqin Qi Liming Song Liang Zhu Xiangyang Xu 《Environmental science and pollution research international》2014,21(9):5983-5990
Bioremediation using isolated anti-cyanobacterial microorganism has been widely applied in harmful algal blooms (HABs) control. In order to improve the secretion of activated anti-cyanobacterial substances, and lower the cost, a sequential optimization of the culture medium based on statistical design was employed for enhancing the anti-cyanobacterial substances production and chlorophyll a (Chl a) removal by Streptomyces sp. HJC-D1 in the paper. Sucrose and KNO3 were selected as the most suitable carbon and nitrogen sources based on the one-at-a-time strategy method, and sucrose, KNO3 and initial pH were found as major factors that affected the anti-cyanobacterial ability of the isolated stain via the Plackett–Burman design. Based on the response surface and canonical analysis, the optimum condition of culture medium was obtained at 22.73 g l-1 of sucrose, 0.96 g l-1 of KNO3, and initial pH 8.82, and the Chl a removal efficiency by strain HJC-D1 increased from 63?±?2 % to 78?±?2 % on the optimum conditions. 相似文献
139.
为研究建筑废物红砖和工业废物煤渣用作人工湿地脱氮基质的可行性,分别通过静态吸附实验和动态NHf—N去除效果实验进行考察。结果表明,红砖和煤渣对NH4+-N最大静态吸附量分别为0.2533mg/g和0.0533mg/g,其吸附等温曲线均符合Freundlich型吸附方程,吸附常数分别为0.0419和0.0091;红砖煤渣组合对污水中NH4+-N平均动态脱除率达到41.18%,高于红砖的37.63%和煤渣的30.92%。 相似文献
140.
Enhanced electrokinetic remediation of lead-contaminated soil by complexing agents and approaching anodes 总被引:1,自引:0,他引:1
Tao Zhang Hua Zou Minhui Ji Xiaolin Li Liqiao Li Tang Tang 《Environmental science and pollution research international》2014,21(4):3126-3133
Optimizing process parameters that affect the remediation time and power consumption can improve the treatment efficiency of the electrokinetic remediation as well as determine the cost of a remediation action. Lab-scale electrokinetic remediation of Pb-contaminated soils was investigated for the effect of complexant ethylenediaminetetraacetic acid (EDTA) and acetic acid and approaching anode on the removal efficiency of Pb. When EDTA was added to the catholyte, EDTA dissolved insoluble Pb in soils to form soluble Pb–EDTA complexes, increasing Pb mobility and accordingly removal efficiency. The removal efficiency was enhanced from 47.8 to 61.5 % when the EDTA concentration was increased from 0.1 to 0.2 M, showing that EDTA played an important role in remediation. And the migration rate of Pb was increased to 72.3 % when both EDTA and acetic acid were used in the catholyte. The “approaching anode electrokinetic remediation” process in the presence of both EDTA and acetic acid had a higher Pb-removal efficiency with an average efficiency of 83.8 %. The efficiency of electrokinetic remediation was closely related to Pb speciation. Exchangeable and carbonate-bounded Pb were likely the forms which could be removed. All results indicate that the approaching anode method in the presence of EDTA and acetic acid is an advisable choice for electrokinetic remediation of Pb-contaminated soil. 相似文献