Treatment and Purification

It evolves a methodology for identifying hot spots in Indian rivers. The water quality data is based on the average values observed during the last ten years (2001-2011) at 371 monitoring stations of CWC on almost all major, medium and minor rivers in India. In respect of Dissolved Oxygen and Biochemical Oxygen Demand, the Central Pollution Control Board's classification has been considered for evaluating the hot spot in the rivers.

The physical and chemical quality of river water is important in deciding its suitability for drinking purposes. As such the suitability of river water for potable uses with regard to its chemical quality has to be deciphered and defined on the basis of the some vital characteristics of the water. Bureau of Indian Standards (BIS) vide its document IS: 10500:1991, edition 2.2 (2003‐09) has recommended the quality standards for drinking water and these have been used for finding the suitability of river water. On this basis of classification, the natural river water of India has been categorized as desirable, permissible and unfit for human consumption.

This study published in the journal The American Journal of Tropical Medicine and Hygiene (AJTMH) aimed at assessing water contamination and the relative effectiveness of three options for point-of-use water treatment in South India.

This report by the Kerala State Council for Science, Technology and Environment (KSCSTE) and Centre for Water Resources Development and Management (CWRDM) on water quality monitoring in Kerala covers all its forty four river basins. This is being done under the “Environmental Monitoring Programme on Water Quality” under which samples are being collected both from surface and groundwater sources.

Groundwater sampling stations were fixed after conducting a sanitary survey in the panchayats. Water Quality Information System is being developed using Geographical Information Systems (GIS) to manage the water quality from point or non-point source of pollution.

In the first phase of the project, three river basins of Kerala viz. Kabbini, Periyar and Neyyar were monitored. The network was later expanded to basins such as Chaliyar, Kadalundi, Meenachil, Karamana, Anjarakandi, Pamba, Muvattupuzha, Bharatapuzha, and Chalakudy. 

This draft report on the study of lakes by the World Wildlife Fund for Nature (India) documents the physical condition of the lakes in Mumbai. Apart from the three lakes - Tulsi, Powai and Vihar that used to provide water to Mumbai residents, there are many lakes in the Bombay Municipal Corporation jurisdiction that are either polluted by human sewage or industrial effluents and have remained neglected with increasing urbanization.

There is very little to no data available on the existence of lakes of Mumbai. Several RTI’s to the government bodies also revealed that there was a lacuna in terms of the availability of the data; as a result most of the water bodies are easily exploited. Under this study the baseline data was prepared with the help of Google Earth website. The areas appearing to be lakes were marked on the Google Earth Images. These were verified by the field staff through onsite visits. The survey was conducted during September and October, 2008 and March, 2009. The study considers only the fresh water lakes which were accessible and saline water impoundments have not been considered.

The level of nitrate in drinking water was tested from groundwater artesian wells located within farms and surrounded by crops (mostly rice and wheat rotations).

Nitrate pollution in groundwater is associated with nitrogen loads in the environment. In urban areas, it is associated with sewage and in agriculture areas, with livestock sources and nitrogen fertiliser inputs. Nitrate pollution in drinking water can have serious health impact on humans, especially for babies and children. The most significant potential health effects of drinking water contaminated with nitrate are the blue-baby syndrome (methemoglobinemia) and cancer.

This report presents the findings of a study conducted by CPCB with the help of Indian Institute of Technology, Roorkee and Anna University, Chennai  on the performa

Now-a-days heavy metal arsenic poses a health risk problem throughout the world. Arsenic may be found in water which has flowed through arsenic-rich rocks. Severe health effects have been observed in populations drinking arsenic-rich water over long periods in countries world-wide.

This study was commissioned recognizing the fact that discharge of untreated sewage occurs not only because of inadequate installed capacity of sewage plants, but also due to the inadequate maintenance of existing plants.

This discussion paper by the Asian Development Bank (ADB) examines the current state of sanitation services in India and offers recommendations that can help key stakeholders work toward universal sanitation coverage in India.

Providing environmentally-safe sanitation to millions of people is a significant challenge, especially in the world’s second most populated country. The task is doubly difficult in a country where the introduction of new technologies can challenge people’s traditions and beliefs.

This discussion paper examines the current state of sanitation services in India in relation to two goals—Goal 7 of the Millennium Development Goals (MDGs), which calls on countries to halve, by 2015, the proportion of people without improved sanitation facilities (from 1990 levels); and India’s more ambitious goal of providing “Sanitation for All” by 2012, established under its Total Sanitation Campaign.

Content courtesy: India WASH Forum