Siemens Innovations for Sustainable Water Management

Siemens Water Technologies recently licensed the Crown sludge disintegration system, which expands the company's waste-to-energy product portfolio. The system is a cell lysing process, which is installed after the sludge thickeners but before the digester, eliminates digester foaming, increases methane gas production by up to 30%, and reduces solids for disposal by 20%. The Crown system complements Siemens' Dystor dual-membrane gas holder system that captures biogas produced by the anaerobic process.

Two Dystor gas holder systems will soon be operating at Rialto (CA, USA), as part of an upgrade to the city's wastewater treatment plant. Chevron Energy Solutions is also partnering with the city on the project. The Dystor systems will be used to store methane gas produced from treating municipal wastewater sludge and local restaurant kitchen grease. Increasing its biogas storage will help Rialto further reduce its energy costs, grow city revenues, and improve air quality.

Siemens also added a new Sludge Belt Dryer to its biosolids management portfolio this year. The new convective belt dryer comes in a one- or two-belt design that provides uniform evaporation and has an adjustable speed belt to vary residence times. The dryer offers low emissions, low dust, a granular final product, and a low thermal requirement with possible heat recovery from low temperature waste energy sources.

The third new product that Siemens is introducing at WEFTEC this year is another licensed technology, called the ELODE (Electro-Osmosis Dehydrator) device. The electro-dewatering device extracts both free and absorbed water from organic and inorganic residual materials. It can yield efficiencies greater than 40% dry solids, reducing typical municipal and industrial waste sludge volumes by at least half.

In addition to new biosolids and energy management technologies, Siemens Water Technologies announced developments in its water reuse product portfolio with a new MBR technology, originating from the company's R&D centre in Singapore. The MemPulse MBR device introduces air and mixed liquor into the bottom of the membrane modules through an "airlift effect." This increases scouring effectiveness, decreases operation and maintenance costs, and reduces energy consumption.

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