A study of the effectiveness of sewage treatment plants in Delhi region

Abstract

This is a conventional kind of monitoring study. The objective of the study was to assess and monitor the physicochemical parameters in wastewater at inlet and outlet of sewage treatment plant (STP) and also to study the effectiveness of the STPs. The average concentration of parameters at inlet sampling site pH, electrical conductivity, total dissolved solids, are 7.16, 2,169 lS/cm, 766.06 mg/l, and major ions bicarbonate, nitrate, sulphate, phosphate, chloride, sodium, potassium, magnesium and calcium values 515. 88, 4.28, 82.85, 15.17, 7.01, 23.08, 29.34, 4.14 and 84.31 mg/l. While the average concentration of these parameters, after treatment shows following values 7.47, 2,161.43 (lS/cm), 695.81, 436.52, 1.25, 99.22, 12.69, 6.83, 23.18, 29.07, 4.40 and 82.65 mg/l, respectively. Further, to check the Na % and sodium absorption ratio at inlet and outlet which 27.89 %, 0.67 and 28.19 %, 0.68, respectively, for the suitability of the wastewater. Finally, the agglomerative hierarchical clustering techniques were used to study the similarity in the sewage treatment plants. The result suggests that there is considerable improvement in the wastewater quality after treatment except at the Pappankalan and Coronation Pillar, Timarpur.

Sediments and Water Column Contamination by Heavy Metals in Ekulu River, Nigeria: Ecological and Human Health Risk Assessment

“…the release of some environmental pollutants such as heavy metals [4]. The discharge of wastewater from industrial effluent of manufacturing/processing companies, coal mine acid drainage, application of inorganic fertilizer, sludge from sewage and deposition of atmospheric pollutants have been reported to constitute the principal contributors of heavy metals found in sediments and water columns of rivers [2,5,6].…”

Assessment of heavy metal contamination in the sediment of the River Ghaghara, a major tributary of the River Ganga in Northern India

“…Many activities such as land use/land cover change Narsimlu et al 2015;Kumar et al 2017), sewage sludge, mine waste, industrial waste, waste water (Gautam et al 2013), atmospheric pollutants, pesticides, and fertilizer applications are the main activities controlling the flow of river and contributors of heavy metals discharged into rivers, lakes, estuaries, and marines (Chen et al 2004;Adaikpoh et al 2005; Lepane and Heonsalu 2007;Amin et al 2014;Singh et al 2016Singh et al , 2017. Beside these wastes, rivers also carry large quantities of solid wastes, including thousands of animal carcasses and hundreds of human corpses are dumped into the active channel of the rivers and on its banks every day in recent years.…”

Distribution of nickel in different agro-climatic zones of Jharkhand, India

“…In urban areas, the soil is polluted by direct disposal of untreated waste on soil. The crops and vegetables are grown on these soils and irrigated by untreated sewage wastewater having elevated concentration of heavy metals (Bharose, Singh, & Srivastava, 2013;Gautam, Sharma, Tripathi, Ahirwar, & Singh, 2013).…”