Water & Wastewater E-Zine
June 2011

This Month´s Featured Articles, Papers & Reports
Expandable oxidation ditch helps midwest operating company meet discharge limits, control odors and cut O&M costs
Planned expansion and asset renewal of an operating company’s water reclamation facility (WRF) in the Chicago suburbs required the need to comply with new stringent nutrient discharge limits. Located in a residential/commercial area, the 1.5 million gallon per day (MGD) facility currently serves a population of about 7,500. The selected biological nutrient removal (BNR) system would have to handle double that population over the next few decades and remain odor-free.

The operating ...
Evapotranspiration bed system for the wastewater from scenic and environmentally sensitive areas
The Onsite Wastewater Treatment (OWT), also commonly known as Septic Tank System, is supposedly to provide adequate treatment for individual private dwellings.  In reality, because of its poor efficiency and lack of sound engineering design, the OWT has become a modern façade to pollute the land and groundwater resource.  The evapotranspiration bed (ET-bed) system can effectively treat wastewater effluent from OWTs located in scenic and environmentally sensitive areas (e.g., Switzerland ...
Watson-Marlow Pumps Group

Watson-Marlow's heavy-duty SPX hose pump can reliably handle many harsh materials, including grit-filled sludge, dependably for long periods of time. Peristaltic hose pumps are self-priming, dry running and virtually maintenance-free, with no expensive seals to replace, no check valves to clog, and no rotors and stators to wear out. Unlike other pump types such as gear pumps, diaphragm pumps and progressive cavity (PC) pumps, the highly abrasive nature of sludge does not affect peristaltic hose pump life. Every Watson-Marlow peristaltic pump is an inherent metering and dosing pump with repeatability at 99.5%. Many models include digital drives and displays in washdown enclosures.

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