Sewage Gas Sewage Gases Sewage Gas to Renewable Power Benefits of Sewage Digestion

Wastewater professionals once — Generation of Clarke Energy is a multinational specialist in distributed accepted the high costs of from a waste material power generation technology. Our scope ranges from the operating wastewater treatment — Reduction in carbon emissions supply of a gas or diesel fuelled power generation engine, facilities as a consequence of especially compared to aerobic through to the turnkey installation of a multi-engine power meeting their discharge permit sewage treatment requirements. As the cost of energy — Economical onsite electrical plant. Clarke Energy is an authorised distributor and rises and emphasis on renewable power production & reduced service provider for GE’s reciprocating gas engines. energy increases, local authorities transmission losses The business has a strong focus on aftersales support; and municipalities are seeking — Production of soil improver developing in-country resources to service and maintain solutions that save money and meet — Cost effective, proven our facilities, along with original equipment manufacturer renewable requirements. GE technology approved spare parts. Our aim is to provide high quality Energy’s gas engines provide a renewable energy solution products and installations supported by a reliable, that results in long-term savings for accountable and localised after-sales service. Integrity is a wastewater treatment plants core company value and Clarke Energy operates to the (WWTPs). highest international standards of compliance.

Benefits of working with Clarke Energy — Quality products, balance of plant and installations products mean high technical and environmental performance hence maximum returns for our customers. — Our installations are backed up by the highest levels of localised aftersales support, meaning maximum reliability of the power generation assets we supply. — Extensive experience across a range of gases and applications, meaning tailored, optimal power generation solutions for our customers

Sewage Gas Schematic

Exhaust gas

Reading, UK, sewage treatment works Gasometer Sewage gas

Heat Gas compressor exchanger

Sewage sludge Heat Digester consumer

Electrical energy Sewage sludge, agricultural Sludge utilisation possible drying Energy Costs Conversion Steps from Sewage Advantages Our competence to Power

Waste treatment processes include The process of generation is Seamless dual fuel mixing Clarke Energy has extensive energy-intensive operations such as divided into for steps: maximises renewable energy output multi-national experience in the aeration and pumping. As a result, and smoothens gas production engineering, installation and WWTPs require significant energy 1. Preparation of the input material fluctuations by supplementing with maintenance of generation facilities consumption. As electrical prices including removal of physical as required. operating on sewage gas and other increase, plant operators are facing contaminants gases derived from biological higher energy costs in order to meet 2. Digestion (fermentation), High electrical efficiencies help sources. discharge permit requirements. The consisting of hydrolysis, generate more electricity per unit of second leading expense to WWTP acetogenesis, acidogenesis and sewage gas used. Electrical GE’s reciprocating engines are owners is the cost of energy, behind methanogenesis efficiencies of up to 43% based known for having the highest levels only personnel. For plants that 3. Conversion of the biogas to upon the lower heating value of the of electrical efficiency on the market. employ anaerobic digestion for renewable electricity and useful gas are achieved with GE Jenbacher When coupled with a contractual biosolids treatment, the process of heat gas engines. maintenance agreement with Clarke combusting digester gas to produce 4. Post treatment of the digestate Energy, it will give peace of mind to electricity and heat may provide a LEANOX controls with turbocharger our customers that they will achieve solution to rising operational costs. Sewage is collected in municipal bypass ensures the correct air-to- the highest levels availability and sewage systems and sent to the gas ratio under all operating hence consistent returns from their A large proportion of the world’s waste water treatment plant. From conditions to minimise exhaust gas biogas plant. sewage systems do not recover here it is prepared and sent to the emissions while maintaining stable value from the sewage in the form of sewage digesters. operation. electricity and heat. But, the renewable energy fuel source In the digestion tanks a series of Longer overhaul schedule minimise derived from sewage gas can be biological processes are harnessed maintenance costs with 60,000 converted using reciprocating gas in order to produce biogas. operating hour overhaul intervals. engines, to electricity and heat, Hydrolysis is the process where the offsetting as much as two-thirds of a organic material is solubilised into the plant’s electricity demand and digestion liquid. It then undergoes the eliminating the need to purchase intermediate steps of acidogenesis fossil fuels for plant heating and acetogenesis which create the processes. precursor molecules for methanogenesis. Methanogens feed off these precursors and produce methane as a cellular waste product.

The biogas containing this biologically-derived methane is contained and captured in a gas storage tank which is typically located separately to the main digester. The gas storage tank acts as a buffer in order to balance fluctuations in the production of gas Beddington, UK, 1x JGMC 312 in the digesters.

Where gas production levels are low or highly variable, dual fuel mixing can be used to supplement the sewage gas with natural gas from the mains distribution network.

Mapocho, Chile, 3 x JMS620 If you would like to find out more about how Clarke Energy can help you develop your sewage gas project, please contact your local office for more details.

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