By Satoshi Takizawa
ISBN-10: 4431783989
ISBN-13: 9784431783985
In 2007, the world's city inhabitants exceeded the variety of humans residing in rural components and remains to be growing to be. The variety of urban dwellers who wouldn't have entry to piped water and depend on groundwater can be expanding. in lots of Asian towns, groundwater isn't just the resource of family water but additionally a massive source for business improvement, making greater administration of groundwater assets crucial for sustainable improvement. simply because groundwater is less complicated to entry and prices under water from piped platforms, groundwater abstraction can't be simply regulated. rules for groundwater administration followed in Japan and different Asian nations are in comparison, and applied sciences for effective use of groundwater are elucidated. Groundwater illness can be a significant challenge that exacerbates water shortage in Asian towns. Case experiences illustrate the reason and effects of evidently taking place contaminants akin to arsenic and fluoride, and groundwater illness as a result of anthropogenic contaminants is defined. additionally mentioned are applied sciences for treating infected groundwater to lessen the well-being hazards of ingesting infected groundwater.
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Additional info for Groundwater Management in Asian Cities: Technology and Policy for Sustainability (cSUR-UT Series: Library for Sustainable Urban Regeneration)
Sample text
This resulted in increasing demand for water supply in these large cities. 3. Groundwater Resources in Urban Water Management 37 As shown in Fig. 1, the world urban population was less than 50 million in 1800. After a century, the world urban population exceeded 200 million in 1900. In 1950, it was estimated the world urban population exceeded 700 million. 04 billion in 2003. 5-degree grid cells in 2005. , eastern China, Japan, India, southeast Brazil, and Guinea Bay. 5degree) with urban population more than 1 million are seen in those areas.
Groundwater development dates back to ancient times. However, until the beginning of the twentieth century, only shallow wells (up to 10m in depth) were constructed. The water table was as shallow as 3 to 5m. As of 1950, there were two pumping wells which supplied 390,000 m3/year for domestic use. Urban Growth Period (1950–1955). Several factories were built and the urban area expanded to 2000 ha. 7 million m3/year for the domestic use; the water table fell by around 1m. The Hutuo River flowed all year around.
Organic Solvents The most commonly used methods for the removal of volatile contaminants, such as chlorinated organic solvents, are air-stripping and activated carbon adsorption. Air stripping is economically more suitable where the concentration of organic solvents is rather high, whereas activated carbon adsorption can bring down the concentration of treated water to a lower level. The use of activated carbon adsorption is, however, not very popular because of the labour required to replace the used activated carbon.