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By Satoshi Takizawa (auth.), Satoshi Takizawa Ph. D (eds.)

ISBN-10: 4431783989

ISBN-13: 9784431783985

ISBN-10: 4431783997

ISBN-13: 9784431783992

In 2007, the world's city inhabitants handed the variety of humans residing in rural components and continues to be growing to be. The variety of urban dwellers who wouldn't have entry to piped water and depend upon groundwater can also be expanding. in lots of Asian towns, groundwater is not just the resource of household water but in addition a huge source for commercial improvement, making higher administration of groundwater assets crucial for sustainable improvement. simply because groundwater is less complicated to entry and prices lower than water from piped platforms, groundwater abstraction can't be simply regulated. guidelines for groundwater administration followed in Japan and different Asian international locations are in comparison, and applied sciences for effective use of groundwater are elucidated. Groundwater infection can be a significant challenge that exacerbates water shortage in Asian towns. Case experiences illustrate the reason and results of certainly taking place contaminants comparable 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 dangers of ingesting infected groundwater.

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At this time, water supply systems took water from upstream of the Tama and Kanda Rivers and brought the water all the way down to the city centre by gravity flow. Although they were marvellous civil engineering works, the water supply systems were not connected to each household. Hence, there were many shallow wells in and around the houses. For centuries, those shallow wells were also important sources of water for the residents of Edo. Because those shallow wells were not protected against microbial contamination, contaminated wells infected hundreds of thousands of people since the mid-19th century, when infectious microbes such as cholera and shigella were brought to Japan.

The treatment process of these plants follows the same process as shown in Fig. 6. 1 mg/L in five out of six plants, showing the high removal efficiency of this process. Groundwater Aeration Tray Contact Chamber Sand Filter Chlorination Clear Water Tank Distribution Fig. 6. Iron and manganese removal process by aeration tray and sand filter Fig. 7. Phap Van Water Treatment Plant, Hanoi, Vietnam. 1. Removal efficiency rates of water treatment plants in Hanoi City. 010 Concentration in mg/L. (Source: Nga et al.

5 Conclusion In many Asian cities, groundwater plays an important role to supply drinking water and water for industrial use. In cities such as Hanoi, Ho Chi Minh, Jakarta and Kathmandu, groundwater sources are shrinking due to over-abstraction, and the quality has deteriorated because of a lack of effective countermeasures against anthropogenic contamination. Naturally occurring contaminants such as arsenic and fluoride are also detected at high concentrations in urban groundwater. There are various treatment technologies for the removal of different kinds of contaminants from groundwater, as illustrated in this chapter.

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Groundwater Management in Asian Cities: Technology and Policy for Sustainability by Satoshi Takizawa (auth.), Satoshi Takizawa Ph. D (eds.)

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