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Anaerobic Digestion



Fixed Digester Cover – Radial Beam

ClearStream- Fixed Digester Cover - Radial Beam is economical primary digester cover with small liquid level variation and can also be used as a secondary digester when gas can be stored through other means.  The fixed digester has a limited gas storage capacity. Designs incorporate a water launder or a seal to overcome liquid level variation limitations.  The annular seal achieves a pressure seal utilizing sidesheets submerged in the sludge and contains odors.

Gasholder Cover – Radial Beam or Truss

ClearStream Gasholder Cover - Radial Beam or Truss for a primary or secondary digester that allows for varying volumes of gas storage.  Also allows varying levels of sludge as compared to the fixed digester cover and prevents a large scum blanket.  The slide guides are low maintenance compared to rolling guides. This cover does not require external insulation because there is several feet of gas storage between the roof and the sludge for thermal insulation.

Buoyant Floating Truss Digester Cover

ClearStream- Buoyant Floating Truss Digester Cover is a primary digester cover preventing a large scum blanket since the cover is in direct contact with the sludge to reduce liquid area exposed. This cover is most effective when sludge levels vary significantly and in conditions where extreme foam occurs.  The ballast blocks are located in the attic space where the attic space acts as natural thermal insulation.

Captivator – Increase biogas of anaerobic digestion

Captivator - Evoqua - increases Biogas up to 40% of a conventional anaerobic process by capturing and converting BOD to biogas that otherwise requires aeration energy. Ideal for new wastewater plants, looking for more biogas production for conversion to energy and looking to reduce aeration energy. Retrofit of existing wastewater plants to provide an increase in capacity with a more efficient use of existing space and tankage.

Duo-Deck Floating Digester Cover

Evoqua -  Duo-Deck Floating Steel Digester Covers provide distinct advantages over other floating covers. The completely all welded structure provides a sealed air space within which oxidation of the metal surfaces is virtually eliminated. Prevents scum blanket buildup. Floatable materials – oil, grease, hair, cellulose are kept constantly submerged and in contact with active digesting material. The material stays moist, aiding degradation. The safest design for maintenance personnel after several years of traffic under the cover.

Dystor – membrane digester gas holder system

Evoqua - Dystor® system uses a dome-shaped, engineered membrane system to store biogas, and prevent odors. The Dystor system’s outer membrane remains inflated in a fixed position. The inner membrane moves freely as it stores or releases biogas generated from the anaerobic digestion process. This system can hold up to six times as much gas as conventional steel digester covers, maximizing the energy benefits of the process and providing cost savings. Dystor is more economical to install than steel gas holders and more versatile and more stable than floating covers. Ideal for both primary and secondary digesters, its dome-shaped, engineered membrane system maximizes storage of methane gas and sludge, while also containing odors. Plus, a manufacturer installed system means single-source responsibility.

Crown® Disintegration System – increase biogas & reduce sludge

Evoqua - Crown®​ Disintegration System increases biogas yield from the anaerobic digester by up to 30% and reduces amount of sludge for disposal by up to 20%, drastically lowering disposal costs. The patented mechanical sludge disintegration process uses cell lysis technology to break down sludge at the cellular level. Municipalities with high sludge hauling costs will realize major economic savings, and plants with digestion foaming problems will benefit, as the unique disintegration process disrupts filament-building microorganisms.

JetMix – Anaerobic digestion mixing system

Evoqua - JetMix System, with its simple components sweeps all areas of a storage tank by creating a unique torroidal flow pattern.  Essentially, its floor-mounted nozzles combine with the action of chopper pumps to keep solids suspended or to resuspend solids that have settled, resulting in the desired homogenous mix. Provides power savings of up to 50% or more.

Gas Safety Equipment for Digester Covers, Waste Burners & Flares

Shand Jurs BioGas Safety Flame Arrestors

Shand & Jurs (L&J Technologies) designs, manufactures and tests a complete line of Digester Gas Safety Equipment and Waste Gas Burners/Flares for municipal sewage treatment plants, landfills, dairies, food-processing and breweries. Gas safety equipment on top of digester covers including pressure/vacuum vents, flame arresters, 3-way safety selector valves along with emergency vent/manhole covers and cover position indication. We manufacture both open candlestick and enclosed flares to help reduce emissions. Our candlestick flares are offered with options for automatic ignition at the tip of the flare or at ground level. Our enclosed flares are designed to meet strict emission regulations and/or where open flames are not permitted.  Proudly manufactured in USA.

Gas Conditioning & Cogeneration Engine Systems – Unison

Unison Solutions, Inc.,  manufacturers biogas conditioning, biogas engine, Capstone turbines, and  BioCNG™ vehicle fuel systems. Expertise in purifying biogas includes hydrogen sulfide removal, siloxane removal, COremoval, compression and gas quality monitoring. Unison systems have been installed  at wastewater treatment plants, landfills, dairies and food processing digester plants.

Heat Exchanger – Sludge

Evoqua Heat Exchanger

ATAD – Fuchs

Kusters Fuchs ATAD -Autothermal Thermophilic Aerobic Digestion (ATAD) meets highest treatment objectives regarding biosolids degradation. Thermophilic temperatures of approx. 60°C are easily achieved. Heat retention makes low ambient temperatures in winter no problem. The energy surplus is utilized for water heating and for supporting the space heating system of the plant. The product of FUCHS ATAD is stabilized, disinfected sludge classified as Class A Biosolids. Due to its special features an excellent organic fertilizer, which is highly welcome in agriculture. Dewatering leads to volatile solids contents exceeding 30 % DS. This keeps transportation costs low.

Cannon Mixer

Evoqua Cannon Mixer