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1.
Ravindra K Ameena Meenakshi Monika Rani Kaushik A 《Journal of environmental monitoring : JEM》2003,5(3):419-426
Various physico-chemical characteristics of the River Yamuna flowing in Haryana through Delhi were studied in the summer (April 1998) and winter (Jan.-Feb. 1999). Ecological parameters like dissolved oxygen (DO), pH, nitrate (NO3-), sulfate (SO4(2-)), and phosphate (PO4(3-)), were analyzed and compared with standard permissible limits to assess the best-designated use of the river water for various purposes. The river in Delhi upstream was of better quality whereas the Delhi downstream stretch was polluted as indicated by very low DO and high total dissolved solids (TDS), electric conductivity (EC), total hardness, Na+, K+, Cl-, F- and SO4(2-). The differences in various parameters were statistically significant (p < 0.01) when compared for the Delhi upstream and downstream stretches of the river, particularly in summer. DO and TDS were found to be two important parameters, which showed strong correlation with several other parameters and hence can serve as good indices of river water quality. The river tended to recover from the pollution stress after flowing through a distance of about 80 km downstream of Delhi. 相似文献
2.
Suman Mor Manchanda K. Chhavi Kansal K. Sushil Khaiwal Ravindra 《Environment, Development and Sustainability》2018,20(2):625-639
Dyes and pigments are one of the major water pollutants and if not discharged properly cause ecological disturbance. Considering this, the current study investigates the application of thermal power plant by-product, i.e., fly ash for the elimination of a hazardous methylene blue dye from its synthetic aqueous solution. Experiments were conducted in batch mode to study the effect of pH, temperature, adsorbent dose and contact time. Highest dye removal (94.3%) was achieved at pH 10 using adsorbent dose of 10 g/L in 90 min of contact time at 40 °C. However, for cost-effective operation at neutral pH and room temperature (30 °C), it yields 89.3% dye removal having similar dose and contact time. Equilibrium isotherms for adsorption were analyzed by Langmuir and Freundlich, Temkin and Dubinin–Radushkevich isotherm equations. The results revealed that the best fit model of adsorption closely followed Langmuir adsorption. Based on adsorption isotherm models, thermodynamics parameters ΔG, ΔH and ΔS were calculated. The negative value of ΔG and ΔH revealed that adsorption process was exothermic, spontaneous and physical. The present work suggests that through simple process hydrothermally modified fly ash has the potential to be used as cost-effective and efficient adsorbent for the treatment of wastewater from textile industries. 相似文献
3.
László Bencs Khaiwal Ravindra Johan de Hoog Nico Bleux Felix Deutsch René Van Grieken 《Environmental pollution (Barking, Essex : 1987)》2010,158(11):3421-3430
Daily and seasonal variation in the total elemental, organic carbon (OC) and elemental carbon (EC) content and mass of PM2.5 were studied at industrial, urban, suburban and agricultural/rural areas. Continuous (optical Dustscan, standard tapered element oscillating micro-balance (TEOM), TEOM with filter dynamics measurement system), semi-continuous (Partisol filter-sampling) and non-continuous (Dekati-impactor sampling and gravimetry) methods of PM2.5 mass monitoring were critically evaluated. The average elemental fraction accounted for 2-6% of the PM2.5 mass measured by gravimetry. Metals, like K, Mn, Fe, Cu, Zn and Pb were strongly inter-correlated, also frequently with non-metallic elements (P, S, Cl and/or Br) and EC/OC. A high OC/EC ratio (2-9) was generally observed. The total carbon content of PM2.5 ranged between 3 and 77% (averages: 12-32%), peaking near industrial/heavy trafficked sites. Principal component analysis identified heavy oil burning, ferrous/non-ferrous industry and vehicular emissions as the main sources of metal pollution. 相似文献
4.
Khaiwal Ravindra Suman Mor 《Environmental science and pollution research international》2018,25(32):31929-31934
India accounts for around 50% of the world’s open defecation, and under a World Bank initiative, a rural district was selected to be the first open defecation-free (ODF) district in Punjab. Considering this, the current study aims to evaluate the application and impact of a smartphone-based instant messaging app (IMA) on the process of making Fatehgarh Sahib an ODF district. The District Administration involved the Water Supply and Sanitation Department, Non-government Organizations, and volunteers to promote the process of a community-led total sanitation. Proper training was provided to the volunteers to spread awareness about the triggering events, health impacts of open defecation, and monetary benefits of building new individual household latrine (IHHL). IMA was used as an aid to speed up monitoring and for the evaluation of a sanitation program. All the volunteers were connected to an IMA. This helped in providing a transparent and evidence-based field report on triggering events, follow-up activities, validation of existing IHHL, and monitoring of construction of new IHHL. IMA is a cost-effective tool as it is already being used by the volunteers and requires no additional cost (on the user or on the project) but requires a training on ethical uses of mobile and data safety. 相似文献
5.
Appraisal of salinity and fluoride in a semi-arid region of India using statistical and multivariate techniques 总被引:1,自引:0,他引:1
Suman Mor Surender Singh Poonam Yadav Versha Rani Pushpa Rani Monika Sheoran Gurmeet Singh Khaiwal Ravindra 《Environmental geochemistry and health》2009,31(6):643-655
Various physico-chemical parameters, including fluoride (F−), were analyzed to understand the hydro-geochemistry of an aquifer in a semi-arid region of India. Furthermore, the quality
of the shallow and deep aquifer (using tube well and hand pumps) was also investigated for their best ecological use including
drinking, domestic, agricultural and other activities. Different multivariate techniques were applied to understand the groundwater
chemistry of the aquifer. Findings of the correlation matrix were strengthened by the factor analysis, and this shows that
salinity is mainly caused by magnesium salts as compared to calcium salts in the aquifer. The problem of salinization seems
mainly compounded by the contamination of the shallow aquifers by the recharging water. High factor loading of total alkalinity
and bicarbonates indicates that total alkalinity was mainly due to carbonates and bicarbonates of sodium. The concentration
of F− was found more in the deep aquifer than the shallow aquifer. Further, only a few groundwater samples lie below the permissible
limit of F−, and this indicates a risk of dental caries in the populace of the study area. The present study indicates that regular monitoring
of groundwater is an important step to avoid human health risks and to assess its quality for various ecological purposes. 相似文献
6.
Kavita Plaka Khaiwal Ravindra Suman Mor Krishan Gauba 《Environmental monitoring and assessment》2017,189(1):40
The aim of the study was to assess the prevalence of dental fluorosis, dental caries, and associated risk factors in the school children of district Fatehgarh Sahib, Punjab, India, using a cross-sectional study design. Oral health status of children aged between 8 and 15 years was assessed using World Health Organization (WHO) 2013 criteria. Dental fluorosis was assessed using Dean’s index, and dental caries were recorded using decayed, missing, filled/decayed, extracted, filled (DMF/def) indices. Four hundred school children were examined, of which 207 were in the 8–11-year-old group and 193 were in the 12–15-year-old group. The overall prevalence of dental fluorosis was 4.1%, which might be linked to a high concentration of fluoride in drinking water at certain locations of rural Punjab. The prevalence of dental caries was 36.5% with a mean DMF score of 0.3 and def score of 0.6. Risk factors for dental caries include oral hygiene behavior and sugar consumption patterns. The study highlights the need to increase awareness about the oral health and hygiene among the school children in India. 相似文献
7.
Malik Vivek Singh Ravindra Khaiwal Singh Meenu 《Environmental science and pollution research international》2021,28(47):66519-66521
Environmental Science and Pollution Research - 相似文献
8.
Malik Vivek Singh Ravindra Khaiwal Rattan Preety Dayal Devi Attri Savita Verma 《Environmental science and pollution research international》2021,28(23):29085-29095
Environmental Science and Pollution Research - This study investigates the effect of environmental risk factors among North Indian children aged between 6 and 16 years associated with body mass... 相似文献
9.
Mor S De Visscher A Ravindra K Dahiya RP Chandra A Van Cleemput O 《Waste management (New York, N.Y.)》2006,26(4):381-388
Landfilling is one of the most common ways of municipal solid waste disposal. Degradation of organic waste produces CH(4) and other landfill gases that significantly contribute to global warming. However, before entering the atmosphere, part of the produced CH(4) can be oxidised while passing through the landfill cover. In the present study, the oxidation rate of CH(4) was studied with various types of compost as possible landfill cover. The influence of incubation time, moisture content and temperature on the CH(4) oxidation capacity of different types of compost was examined. It was observed that the influence of moisture content and temperature on methane oxidation is time-dependent. Maximum oxidation rates were observed at moisture contents ranging from 45% to 110% (dry weight basis), while the optimum temperature ranged from 15 to 30 degrees C. 相似文献
10.
The effect of fireworks on air quality was assessed from the ambient concentrations of various air pollutants (SO2, NO2, PM10 and TSP) during Diwali festival in Hisar city (India), in November 1999. The extensive use of fireworks was found to be related to short-term variation in air quality. During the festival the concentration of SO2 was observed to be increased approximately 10-fold at few sites, whereas the concentrations of NO2, PM10 and TSP increased 2-3 times, compared to the data collected on a typical winter day in December 1999. The maximum NO2 concentration was observed a day after the festival. The diurnal pattern of the above pollutants showed a slight increase in the night. The levels of these pollutants observed during Diwali were found to be moderately high, which can be associated with serious health impacts. 相似文献