The water may be supplied to the consumers either- (1) by continuous system or (ii) intermittent system. In the continuous system, water is available to the consumers for all 24 hours a day. Whereas, the intermittent system supplies water only during the peak hours of water demand, which is fixed hours in the morning and evening period of the day.

Treatment of wet organic waste such as kitchen waste has been currently one of the important environmental issues that need to be resolved. Kitchen waste has a potential to recover biogas by application of anaerobic treatment.