Stormwater collection and underground storage and treatment using aerobic bacteria and settlement of particulates in a near hoizontal stream

摘要

A water treatment apparatus (107) for treating stormwater is disclosed. The apparatus includes a substantially water impermeable treatment tank (111) installed underground and a means for treating the stormwater. The treatment tank has one or more walls forming a tubular elongate enclosure to allow a near horizontal stream of stormwater to flow through it. The treatment means primarily consists of a combination of settlement of particulates as a result of the water flow through the tank and decomposition of waste as a result of aerobic bacteria in the tank. A holding tank (105) may also be included before the treatment tank. In this case the treatment tank may (111) may encircle the holding tank. The tanks may be made up from modular pieces. There may also be a flow control means (110) to adjust the flow rate of the system (107) as well as further filtering (115) and an anaerobic bacteria treatment. A storage tank (116) can be used to hold the treated water.