Contamination, Pollution and Quality

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September 5, 2024 The current state of play regarding sewage treatment standards in India
Clogged pipes: India's sewage treatment crisis (Image: Trey Ratcliff, Flickr Commons; CC BY-NC-SA 2.0)
September 2, 2024 Recommendations made by an expert committee, the NGT's subsequent orders, and a critical analysis of these developments
Drum screens at Bharwara sewage treatment plant (Image: India Water Portal)
August 30, 2024 This article traces the evolution of the legislative framework for water pollution in India and its implications for wastewater treatment standards in the country. 
Open drains in Alwar (Image Source: IWP Flickr photos)
August 22, 2024 The journey of sewage treatment standards and the challenge of treating India’s growing wastewater
Need to fix wastewater effluent standards (Image: Kristian Bjornard)
August 1, 2024 Recognising the limitations of relying solely on herbicides, a strategic shift towards preventive measures is crucial
Relying solely on chemicals to keep weeds at bay isn't sustainable and can harm the environment. (Image: Needpix)
June 12, 2024 Leveraging research to optimise water programs for improved health outcomes in India
Closing the tap on disease (Image: Marlon Felippe; CC BY-SA 4.0, Wikimedia Commons)
Groundwater quality monitoring and evaluation in Jammu and Kathua districts (Jammu & Kashmir) - A research report by National Institute of Hydrology
The study evaluates groundwater on the basis of widely used graphical methods like Piper, Stiff and US Salinity Laboratory classification. Posted on 23 Jun, 2010 11:55 PM

The study evaluates groundwater on the basis of widely used graphical methods like Piper, Stiff and US Salinity Laboratory classification. The study concludes that, in general, the groundwater in the area varies from medium salinity to very high salinity, the latter being more common in the irrigated stretches. The irrigators are advised to ensure good land and water management practices in the fields, with particular emphasis on creating favorable leaching and drainage conditions to avoid further development of saline conditions in the area. 

Spatial variability of groundwater quality in Jammu district - A research report by National Institute of Hydrology
The study applies geostatistical techniques to the groundwater quality data of December 1994 in parts of Jammu district. Posted on 23 Jun, 2010 10:58 PM

The study applies geostatistical techniques to the groundwater quality data of December 1994 in parts of Jammu district. Groundwater quality deterioration has led to considerable interest in the design of investigative studies and monitoring programs on the issue.

Various management measures need to take into account the spatial and temporal behavior of groundwater. The spatial dependence between observations can be expressed by semi variance, which is a measure of the average similarity between observations at a given distance apart. One of the prime reasons for obtaining a semivariogram is to use it for estimation of the variable at unsampled locations.

Hydrochemical studies of Hindon river, UP - A research report by National Institute of Hydrology
A detailed survey of the river Hindon in Uttar Pradesh, was carried out to understand the nature of waste effluents and their impact on water quality. Posted on 23 Jun, 2010 07:49 PM

A detailed survey of the river Hindon was carried out to understand the nature of waste effluents and their impact on water quality.  As per the study, the river water is subject to varying degrees of pollution, caused by numerous untreated waste outfalls of municipal and industrial effluents.

The main sources, which create pollution in the river, include municipal wastes of Saharanpur, Muzaffarnagar and Ghaziabad districts received through tributaries as well as direct outfalls. In the non-monsoon months, the river is completely dry, right from its origin upto Saharanpur town. The effluents of Nagdev nala and Star Paper Mill at Saharanpur generate the flow of water in the river.

Skimming well technology for saline groundwater management
Skimming well is any technique employed with an intention to extract relatively freshwater from the upper zone of the fresh-saline aquifer. They are generally designed for irrigation or drinking water supply. Posted on 23 Jun, 2010 12:49 PM

The term skimming well is used for any technique employed with an intention to extract relatively freshwater from the upper zone of the fresh-saline aquifer. The types of skimming wells include: the conventional single strainer well, multi-strainers wells, scavenger wells, radial collector wells and dug wells.

Contaminant source identification in groundwater
Identification of unknown contaminant source(s) in terms of location and strength in space and time for remediation purposes have been central issues in environmental management. Posted on 23 Jun, 2010 11:42 AM

 

Water quality of district Haridwar - A research report by National Institute of Hydrology
The study attempts to determine the water quality of all available sources of water be it surface, ground or waste water and find out the sources of pollution for the Haridwar district of Uttarakhand. Posted on 22 Jun, 2010 08:11 AM

The study attempts to determine the water quality of all available sources of water be it surface, ground or waste water and find out the likely sources of pollution for the Hardwar district of Uttar Pradesh. The physico-chemical parameters of the water were determined. The effect of monsoon on the water quality was studied by collecting and analyzing the pre and post monsoon samples.

Adsorption of zinc in bed sediments of river Ganga - A research report by National Institute of Hydrology
The study attempts to determine the adsorption characteristics of bed sediments of rivers for the control of metal pollution in River Ganga at Haridwar. Posted on 22 Jun, 2010 08:10 AM

The study attempts to determine the adsorption characteristics of bed sediments of rivers for the control of metal pollution. In particular, it looks at adsorption of zinc ions on bed sediments for the river Ganga at Hardwar. In the natural conditions of river water, suspended loads and sediments have an important function of buffering higher metal concentrations of water, particularly by adsorption or precipitation. 

Groundwater quality in Greater Guwahati with respect to trace elements - A research report by the National Institute of Hydrology
The study on groundwater quality of Greater Guwahati analyses various trace elements in samples of drinking water. Posted on 22 Jun, 2010 08:08 AM

The study on groundwater quality of Greater Guwahati analyses various trace elements in samples and ascertains that their concentration is much higher than the tolerance limit prescribed for drinking water. The trace element analysis focuses on metals such as Cu, Co, Cd, Fe, Zn and Pb.

Owing to the inadequacies of piped water supply, the Greater Guwahati area depends on groundwater from ringwells and tubewells for drinking purposes. Groundwater is mostly polluted from the effluents discharged by industries on land, seepage from sewage lines & tanks and application of pesticides on agricultural land. Due to the low flow velocity, groundwater once contaminated will remain so for longer periods. Metals assume significance because of their greater toxicity, accumulative and non-biodegradable behavior. 

Pollution potential of pesticides in the Hindon river – A research report by the National Institute of Hydrology
The study attempts to find out the pollution potential in the Hindon river, a polluted river in western Uttar Pradesh. Posted on 22 Jun, 2010 08:07 AM

The study attempts to find out the pollution potential in the Hindon river, a polluted river in western Uttar Pradesh. Qualitative and quantitative estimation of pesticides was done using gas chromatography. Among various organic, inorganic and biological water pollutants, pesticides are very dangerous and harmful because of their carcinogenic properties. Pesticides are bio-accumulative and relatively stable and therefore require close monitoring.

Hydrological considerations for landfill and waste disposal sites – A research report by National Institute of Hydrology
The report details out the status of landfill and waste disposal technologies in India & abroad and reviews the scientific studies undertaken to support its design for long-lasting performance. Posted on 21 Jun, 2010 04:57 PM

The report details out the status of landfill and waste disposal technologies in India & abroad and reviews the scientific studies undertaken to support its design for long-lasting performance. Hydrological considerations play a major role in the selection of landfill sites and in the design and performance of landfills for hazardous waste management. A landfill is a form of a biochemical reactor where the municipal solid waste (MSW) comes into contact with moisture, a catalyst, and gets decomposed into solid waste, gases and liquid contaminants (leachate) resulting in the release of heat. The design of the control and recovery systems requires the estimation of amount and composition of gas and leachate accurately, as also the changes in these with time. Lysimeters are used to simulate the landfill performance.

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