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Comment Environment, Health, Safety & Security

Slash sewage-sludge volumes with this add-on digester

By Tetsuo Satoh |

A 60% reduction in the sludge volume was achieved at the sewage treatment plant of Noboribetu City, Hokkaido, Japan, after installing a Bio-Diet SBD-1200 system from Nippon Steel Kankyo Engineering Co. (NSKE; Tokyo, www.nske.co.jp). The demonstration unit, developed at the Wakayama Cleanup Center of Noboribetu City, was tested during the summer. In the Bio-Diet system (diagram), polluted sludge from the sedimentation tank is continuously fed to a side reactor, where a proprietary oxidizing agent is added to destroy the cell walls of microbes in the sludge. The treated sludge is returned to the aeration tank, where the biochemical oxygen demand (BOD) is then reduced through aerobic digestion. The Bio-Diet system is said to “drastically reduce” the cost for processing polluted sludge, and offers low installation cost, is easy to operate, requires no dewatering and has no adverse effect on processed-water quality. The company says Bio-Diet is especially suited to treating polluted sludge with relatively low levels of inorganic compounds, and can be applied to treating wastewater from a wide range of the chemical process industries, including food, beverage, brewing, chemical, oil-and-fats, dying and fiber industries. The…
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