... problems and its countermeasures in urban area of north China, Japanese J .of Water Treat. biol., 41(1), 41-50. (in Japanese with English summary) Yang H. and Abbaspour K. C. (2007). Analysis of wastewater ... consideration here Assuming that 60% of treated sewage is currently reclaimed from 41% of the current total volume, this would result in a saving of 122 million m3 of the groundwater required. Moreover, ... questionnaire was answered by the household at the end of the six-day survey for each day of the study period. The questions were read before and after each period of water use, and the frequency and...