In Tsukuba-south First Industrial Park, sewage after-treatment from the factories on the park flows into a regulating pool before being discharged into the Seimei River. This is in compliance with environmental standards. During the summer and autumn, the growth of algae in this regulating pool produces an algal or water bloom. To improve the water quality, an aeration system powered by a wind/photovoltaic hybrid power generation system has been installed to increase the dissolved oxygen in the pool
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