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Comment Water Treatment

Combine three steps in one unit with this wastewater-treatment process

By Gerald Ondrey |

A cyclic activated-sludge (AS) process, trademarked te-cyc, combines biological treatment and solids settlement in a single treatment step, thereby significantly reducing the footprint compared to a conventional AS plant, which requires three separate processes — primary settlement tanks, aeration tanks and final settlement, says Ben Hazard, a process engineer at Te-Tech Process Solutions, Ltd. (Totton, Southampton, U.K.; www.te-tech.co.uk). “This ultimately results in a lower capital cost due to less infrastructure being required.” The first plant of this kind was completed in 1999 at Neubrandenburg, Germany, with a nominal capacity of 140,000 PE (population equivalent). Now, Te-Tech Process Solutions has developed a modular unit that has been specifically designed for small- to medium-sized treatment works, which offers the same benefits of the larger plants, but at a smaller scale and with a design for manufacture and assembly approach in mind. The te-cyc process is fundamentally based on a traditional sequencing batch reactor (SBR) whereby a sequence of tank filling, wastewater aeration, solids settlement and treated effluent decanting is repeated on a continuous cycle, explains Hazard. In the te-cyc process (diagram),…
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