In this study, we analyze an optimal policy and evaluate new devices and technologies to improve the water quality of Lake Kasumigaura, considering both - the total ecological system in and around the lake and the socio-economic situational changes over a certain period of time. The optimal...

Northeast Asia countries (e.g. around the Sea of Japan area) cooperate in economic and environmental policies, etc., because the comprehensive problems like the climate change and global warming occur in recent years. The ring Sea of Japan area consists of Japan, Republic of Korea, China, and...

This study focused on the Edo city and the basin of the Tokyo bay in the late 19th century. Edo is the former name of Tokyo, Japan, and was the central political city in the Edo period, which was from 1603 to 1868. In 1603 the Shogunate Government of Edo was formed, and the Edo period was ruled...

Stockbreeding industries are increasing rapidly in rural areas around big cities in China, especially the rural areas around Beijing. This increase carries high risks to the environment due to emissions of large amounts of pollutants in terms of COD (chemical oxygen demand), T-N (total nitrogen)...

Pollutants emitted by pollution generation sources do not only deteriorate the water quality, but the emissions of greenhouse gas also contribute to the green house effect. Material balance of biomass wastes shows there is a trade-off between water pollution and global warming. Therefore, in...

In the study, we proposed the environmental policies to decrease water pollutants that generate from household, non-point and production in Jiaxing city of China. We especially introduced biomass plant technology for pig farming industry in order to improve the water environment. We constructed...

To this day in Japan, the water supply service for agricultural use has been formed as the supply-driven system. In fact, the farmers can use the utilization volume of agricultural water and they have to pay the price of agricultural water fee decided by water supplier side. However, diverse...

Since the industrial revolution, growing and active economic activities in urban area have disrupted sustainable material flow balance in the environment, and the imbalance has induced some serious environmental problems. In order to realize proper urban management, taking measures to keep...

Recently, various environmental problems have been generated with the rapid economic development in China. That's because China currently over-emphasized economic development beyond environmental issues; therefore, now it is important to enforce optimal environmental policies in order to achieve...

Increasing scarcity of freshwater resources and growing environmental awareness give rise to the use of reclaimed wastewater as an additional source of water supply. However, the amount of wastewater that can be reclaimed for reuse is subject to many factors, ranging from technical possibility...