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571.
Study on phosphorus loadings in ten natural and agricultural watersheds in subtropical region of China 总被引:3,自引:0,他引:3
Yuyuan Li Cen Meng Ru Gao Wen Yang Junxia Jiao Yong Li Yi Wang Jinshui Wu 《Environmental monitoring and assessment》2014,186(5):2717-2727
Water eutrophication in subtropical regions of southern China threatens watershed health and is of major concern. However, annual phosphorus (P) loading and its dominant causes are still unclear, especially at the watershed scale. In this study, we investigated dynamic P loadings and associated factors (e.g., land use, livestock production, and runoff depth) in ten watersheds that varied in area from 9 to 5,212 ha in a hilly area of Hunan Province, China. A flowmeter was installed at the outlet of each watershed, and total P (TP) and soluble P (SP) concentrations were monitored periodically from June 2010 to October 2012. The results showed that annual P loadings (APLs) in the ten watersheds ranged from 22.8 to 247.8 kg P/km2 and that P loss primarily occurred from April to June of each year during the main rainfall season in the study area. In addition, the average eutrophication (>0.05 mg P/L) ratio for stream waters was 86.7 % during the study period, which was indicative of a potentially serious condition for the local water environments. Annual P loadings were linearly related to livestock density (LD; R?=?0.92, p?<?0.01), whereas the eutrophication ratio of stream water was significantly (p?<?0.05) correlated with LD (R?=?0.61), percentage cropland (R?=?0.71), and percentage forest cover (R?=??0.68). Thus, it is concluded that the control of livestock production has the greatest potential for reducing P loadings in watersheds in this subtropical area. This will be beneficial to the amelioration and protection of local environment. 相似文献
572.
Optimization of bio-drying of kitchen waste: inoculation,initial moisture content and bulking agents
Song Xiao Ma Jiao Gao Jiandong Liu Yanbo Hao Yongce Li Wei Hu Ruhai Li Aimin Zhang Lei 《Journal of Material Cycles and Waste Management》2017,19(1):496-504
Journal of Material Cycles and Waste Management - Bio-drying has been proved to be a promising method for treatment of MSW (municipal solid waste) and sewage sludge due to its high energy... 相似文献
573.
Li Shuhao Sun Qiang 《Environmental science and pollution research international》2023,30(5):11584-11599
Environmental Science and Pollution Research - The standardization of formal recycling and rational subsidy plays an important role in waste electrical and electronic equipment recycling. In order... 相似文献
574.
Zihong Xia Jian Li Tingting Wu Caixia Chen Xiaoke Zhang 《Waste management (New York, N.Y.)》2014,34(9):1609-1618
A CFD scheme was presented for modeling municipal solid waste (MSW) combustion in a moving-grate incinerator, including the in-bed burning of solid wastes, the out-of-bed burnout of gaseous volatiles, and the selective non-catalytic reduction (SNCR) process between urea (CO(NH2)2) and NOx. The in-bed calculations provided 2-D profiles of the gas–solid temperatures and the gas species concentrations along the bed length, which were then used as inlet conditions for the out-of-bed computations. The over-bed simulations provided the profiles of incident radiation heat flux on the top of bed. A 3-dimensional benchmark simulation was conducted with a 750 t/day commercial incinerator using the present coupling scheme incorporating with a reduced SNCR reduction mechanism. Numerical tests were performed to investigate the effects of operating parameters such as injection position, injection speed and the normalized stoichiometric ratio (NSR) on the SNCR performance. The simulation results showed that the distributions of gas velocity, temperature and NOx concentration were highly non-uniform, which made the injection position one of the most sensitive operating parameters influencing the SNCR performance of moving grate incinerators. The simulation results also showed that multi-layer injections were needed to meet the EU2000 standard, and a NSR 1.5 was suggested as a compromise of a satisfactory NOx reduction and reasonable NH3 slip rates. This work provided useful guides to the design and operation of SNCR process in moving-grate incinerators. 相似文献
575.
Li Xiangyang Wang Lei 《Environmental science and pollution research international》2023,30(5):11542-11561
Environmental Science and Pollution Research - The carbon emission reduction in city regions as a result of the optimization of urban spatial layout is crucial for combating global warming and has... 相似文献
576.
近年来,我国国内有色金属产量和对矿产品需求量快速增长。10种有色金属产量已从1980年的124.8万吨发展到2008年的产量为2,519万吨,增长了20倍多,并从2002年起,连续六年产量位居世界第一;预计到2020年10种有色金属需求总量为3000万吨。 相似文献
577.
利用PLC控制系统,实现在钢渣热焖工艺中的恒压供水和钢渣热焖定时定量喷水的自动控制要求,具有国际先进水平,取得了良好的经济效益、社会效益和环境效益. 相似文献
578.
Zhang Xiaoli Cai Xuewei Wang Zhaowei Yang Xing Li Shan Liang Guiwei Xie Xiaoyun 《Environmental science and pollution research international》2021,28(11):13375-13393
Environmental Science and Pollution Research - A large amount of biochar-derived dissolved organic matter (BDOM) will be released into the environment with biochars application into repairing... 相似文献
579.
Liu Xi Wang Xuelei Zhang Lu Fan Weiying Yang Chao Li Enhua Wang Zhi 《Environmental science and pollution research international》2021,28(2):1712-1724
Environmental Science and Pollution Research - Groundwater pollution seriously threatens water resource safety due to high-intensity land use throughout the world. However, the relationship between... 相似文献
580.
Sun Xue Li Chaolin Ren Liyuan Wang Wenhui 《Environmental science and pollution research international》2021,28(22):27520-27527
Environmental Science and Pollution Research - VUV/UV photodegradation technology, which is free of catalysts or oxidants, has been regarded as an efficient method to decompose gaseous VOCs.... 相似文献