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71.
A solar-powered composite desiccant cooling system has been experimentally investigated. It consists of evacuated tube solar water heater, composite desiccant bed heat exchanger (CDBHE), direct evaporative cooling unit and cooling tower. The composite desiccant material has been synthesized by using iron mesh and jute layer impregnated with calcium chloride solution, and this composite desiccant is placed in shell- and tube-type heat exchanger to make CDBHE. In this desiccant cooling system, the evacuated tube solar water heater is used to produce required hot water for regeneration of composite desiccant material. A cooling tower is used to produce cooling water which is pumped into CDBHE during dehumidification process to remove heat of adsorption. Direct evaporative cooling unit is used to cool the outlet process air of CDBHE. It has been found that the average dehumidification rate increases by 54.1 % when using circulating cooling water. The COPth of desiccant cooling system has been found to be 0.46 with a cooling capacity of 353.8 W. 相似文献
72.
Acute static bioassays were conducted for 96 h period with λ-cyhalothrin to determine its acute toxicity to a freshwater catfish,
Clarias batrachus. The 96 h LC50 value was estimated to be 5.00 μg l−1 (95% confidence limit: 4.114–5.712). The alterations in behavioral pattern, such as change in the color of skin, hyperactivity,
loss of balance, rapid swimming, increased surfacing activity, enhanced rate of opercular activity, as well as prominent rates
of convulsions in treated fish were observed with the increasing concentrations of insecticide as compared to the control
fish. The results indicate that λ-cyhalothrin is highly effective even at very low concentrations. 相似文献
73.
The development activities in mountainous region though provide comfort to the human being and enhance the socioeconomic status of the people but create pressure on the bio-resources. In this paper, the current status of land use/landcover and the vegetation communities of the Solang valley watershed in Himachal Pradesh of Indian western Himalaya has been mapped and presented using remote sensing. This watershed area was dominated by alpine and sub-alpine pastures (30.34%) followed by scree slopes (22.34%) and forests (21.06%). Many tree, shrub, and herb species identified in the study area are among the prioritized species for conservation in the Indian Himalayan Region. Thus, scientific interventions and preparation of action plans based on ecological survey are required for conservation of the Solang valley watershed. 相似文献
74.
Prasad Arani Rajendra Shankar Ramalingam Patil Chandrashekhar K. Karthick Alagar Kumar Amit Rahim Robbi 《Environmental science and pollution research international》2021,28(36):50017-50027
Environmental Science and Pollution Research - The photovoltaic (PV) for irrigation system is an emerging technology to harness the solar energy. The performance of the PV modules depends on the... 相似文献
75.
Renthlei Zothanmawii Borah Bijoy Krishna Trivedi Amit Kumar 《Environmental science and pollution research international》2021,28(24):31097-31107
Environmental Science and Pollution Research - Urbanization is a rapidly growing phenomenon that affects wildlife. Laboratory studies show the effects of night light on the physiology of the... 相似文献
76.
Shrivastava Amit Doda Devendra Kumar Bundele Mahesh 《Environmental science and pollution research international》2021,28(4):3906-3912
Environmental Science and Pollution Research - This paper intends to show the aspects of an environment-friendly hybrid energy system (HES) for reducing the electrical power problems in remote... 相似文献
77.
A review for chromium removal by carbon nanotubes 总被引:1,自引:0,他引:1
Ioannis Anastopoulos Vasileios A. Anagnostopoulos Amit Bhatnagar Athanasios C. Mitropoulos 《Chemistry and Ecology》2017,33(6):572-588
Water pollution is still a serious problem for the entire world. Adsorption technology is a promising process which is based on the fabrication of novel, cheap, non-dangerous and highly sorptive materials for application in wastewater purification processes. Nanomaterials are functional groups which find use in many important fields such as medicine, food processing and agriculture. This review collects information from published works about the use of carbon nanotubes as efficient and promising adsorbents in chromium removal from (real or synthesised) wastewater. For this purpose, isotherm (Langmuir, Freundlich, etc.), kinetic (pseudo-first-, second-order, etc.), thermodynamic (free-energy Gibbs, enthalpy, entropy) and desorption–regeneration studies were discussed in detail. Moreover, significant factors such as pH, agitation time, temperature, adsorbent dosage and initial dye concentration are also reported extensively. The maximum monolayer adsorption capacities of Cr(III) and Cr(VI) ions were 0.39–238.09 and 1.26–370.3?mg/g, respectively. The absolute values of ΔG0 and ΔH0 ranged 0.237–48.62 and 0.16–58.43?kJ/mol, respectively. 相似文献
78.
Toxicology of arsenic in fish and aquatic systems 总被引:2,自引:0,他引:2
Bibha Kumari Vikas Kumar Amit K. Sinha Jawaid Ahsan A. K. Ghosh Hanping Wang Gudrun DeBoeck 《Environmental Chemistry Letters》2017,15(1):43-64
Arsenic (As) is found in waters such as seawater, warm springs, groundwater, rivers, and lakes. In aquatic environments, As occurs as a mixture of arsenate and arsenite, with arsenate usually predominating. The unrestricted application of As pesticides, industrial activities, and mining operations has led to the global occurrence of soluble As above permissible levels of 0.010 mg/L. Continuous exposure of freshwater organisms including fish to low concentrations of As results in bioaccumulation, notably in liver and kidney. As a consequence As induces hyperglycemia, depletion of enzymatic activities, various acute and chronic toxicity, and immune system dysfunction. Here we review arsenic chemistry, the occurrence of arsenic in aquatic system, the transformation and metabolism of arsenic; arsenic bioaccumulation and bioconcentration; behavioral changes; and acute and other effects such as biochemical, immunotoxic, and cytogenotoxic effects on fish. 相似文献
79.
Geetha Varma. V Amit Srivastava 《International Journal of Sustainable Engineering》2018,11(4):272-281
Biosorption process is emerging as a potential alternative for the heavy metal removal from aqueous solutions. A packed bed column containing biomaterials like papaya leaf powder and paddy straw powder was used for copper removal from aqueous solutions. The breakthrough curve was having an S-shaped profile and the breakthrough time became less with increase in initial concentration. Percentage removal of copper was around 85% and 77% for papaya leaf powder and paddy straw powder, respectively for a contact time of 120 minutes and initial concentration of 10 mg/L. A biogeocomposite material was developed to test the enhancement in adsorption using layers of non-woven geotextile material and a significant increase in adsorption was obtained. With the addition of geotextile material in between papaya powder layer and paddy straw powder, there was an average increase of 12.66% and 11.98%, respectively for the removal. A biocomposite material was developed with a mixture of the two biosorbents and the adsorption value of the biocomposite material was in between the two biosorbents. The applicability of Yoon Nelson model and Adam Bohart model were also evaluated and the most suitable model came out to be Yoon and Nelson model. 相似文献
80.