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Everything you need to know about - Renewable Natural Gas To The Natural Gas Pipeline

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  • #16
    Katie Fletcher for BioMass Magazine May 05, 2016 - New cogen system triples energy output from biogas at Oregon WWTP

    On 4 May 2016, Clean Water Services, Energy Trust of Oregon and the Oregon Department of Energy formally announced a new cogeneration system that converts wastewater and grease into renewable energy at the Clean Water Services Durham Treatment Facility.

    Since 1993, Durham has operated a 500-kW cogeneration system using biogas from the communities’ wastewater to offset its own energy usage. By replacing this smaller engine with two new Jenbacher 848-kW engines, Durham now has a 1.7 MW cogeneration system fueled by biogas produced from the anaerobic digestion (AD) of municipal wastewater solids as well as FOG from Washington County restaurants, commercial food processors and others. Average gallons of FOG codigested per week will start at 70,000 gallons and is expected to increase to 100,000 gallons within the next six months. The Durham campus hosts two, 1.3 million gallon digesters.

    Prior to being fed to the engine, the biogas will need to be treated with a gas treatment system made by Unison Solutions that will remove hydrogen sulfide particulates, siloxane and moisture from the raw biogas.

    “Clean Water Services Durham took the steps very deliberately and smartly to design a system that works for increasing the production of biogas to help maximize generation at the plant,” said Dave Moldal, senior renewable project manager with the Energy Trust of Oregon.

    “From our perspective, this is another classic example of the evolution of wastewater treatment plants to resource recovery facilities,” Moldal said. According to Moldal, the first generation was really about protecting public health and the second generation of WWTP—in the ‘70s, ‘80s—began producing value-added products like water, soil amendments and also generating power. “Cogeneration is not new, but this is really the third generation, where we’re using this facility’s existing infrastructure to achieve GHG reduction goals.”

    The $16.8 million project was funded by CWS. The agency received $3 million in cash incentives from Energy Trust and tax credits for combined-heat-and-power from the Oregon Department of Energy in the amount of $2.8 million. The project is expected to cut CWS’ operating costs saving ratepayers money. Around $690,000 savings in electrical costs in the first year is expected and $100,000 savings in heating costs. The project will generate $340,000 annually in tipping fees for FOG disposal.

    CWS also operates the Rock Creek WWTP in Hillsboro. Cordon said the company is looking at implementing RNG for transportation use at this facility.


    • #17
      Nora Goldstein for BioCycle July 2016 - Biogas To Fleet Fuel In South San Francisco

      SSFSC/Blue Line Transfer operates a fully enclosed one-quarter-acre facility comprised of an aerated receiving bay, 8 modular digesters, and two in-vessel composting (IVC) tunnels that can process 11,200 tons/year of food scraps and yard trimmings.

      SSFSC collects both commercial and residential organics in a service area that includes South San Francisco, Brisbane, Millbrae, Colma, San Francisco International Airport and San Mateo County.

      Collected organics are sorted for all visible contaminants — primarily plastic bags. Cleaned material stays in the aeration bay for 2 to 3 days prior to being loaded into one of the 8 digesters. The bay is operated under negative pressure; exhaust air is treated in an acid scrubber that uses sulfuric acid to cleanse gases. Gas from the acid scrubber passes through a biofilter made of wood chips and kept in a moist condition. “The digesters and IVC tunnels are less than 100 yards away from a 800,000 sq. ft. complex of Genentech buildings, as well as other neighbors, so odor control is a main priority,” notes Button.

      SSFSC/Blue Line installed the SmartFerm dry fermentation anaerobic digestion and IVC composting system developed by Eggersmann, and supplied by Zero Waste Energy, LLC, the North American licensee. Each digester has capacity for 240 cubic yards of material. Digesters are loaded with an average of 62 tons/batch; design tonnage is 81 tons/batch.

      On average, the mix going into the digesters is 60 to 65 percent food waste, and 35 to 40 percent green waste. The amount of food waste is kept as high as possible in order to produce more biogas. But there is a delta, where if too much food waste is in the mix, it may not all break down and generate the maximum amount of biogas in the 21-day digestion cycle. The green waste provides adequate porosity year-round.

      Once inside the digester, material is aerated using an in-floor air supply system until the material reaches 125° to 130°F. Exhaust air from this stage is sent to the acid scrubber and biofilter to remove ammonia, VOCs and particulates. After the desired temperature is achieved, the system switches over to the anaerobic process, with microbes consuming the available oxygen. Material is sprayed with a fine mist of liquid from the percolate tank, located under the digesters, facilitating decomposition and biogas production.

      Retention time in the digester is 19 to 21 days. Biogas is produced almost immediately after the system is switched to anaerobic digestion mode. It is pulled into the percolate tank, where biogas from all 8 digesters (all loaded at different times) is mixed and homogenized. Each digester is making different amounts of gas which is captured in the percolate tank. Biogas then is pulled into a storage bladder located on top of the digesters. Ever few hours, the bladder is drained by a small compressor. The biogas is cleaned up using a BioCNG conditioning system, and then put into storage.

      Once the methane content drops below one percent, and hydrogen sulfide is not detected, the digester can be opened. Material is moved to one of the IVC tunnels from 12:00 am to 4:00 am to minimize odor impacts. There is a lot of ammonia in the digestate, so the main purpose of the IVC stage is to scrub out the ammonia before the material is transported to the composting facility. It stays in the IVC for 2 to 3 days. Compostable products break down during digestion, and then are fully disintegrated following the curing phase. Plastic is the primary contaminant when material is removed from the IVCs.

      The digestate from the IVC is very wet at this point, so goes through a curing phase at the composting site for about 45 to 60 days before it is screened. Outbound tonnages from SSFSC/Blue Line are on average 48 percent of the weight of inbound tonnages.

      Fleet Fuel

      SSFSC has converted 27 of the 40 trucks in its fleet to run on CNG. It uses Cummins Westport CNG engines. The 27 trucks are fueled every night between 10:00 pm and 5:00 am using a slow fill system. The digesters produce 380 to 500 diesel gallon equivalents (DGE)/day of compressed RNG, depending on the quantity of food waste in the feedstock mix. Each truck utilizes an average of 30 gallons/day. Instead of fueling about a dozen of its trucks on RNG only, SSFSC uses it in all 27 trucks with CNG engines.

      On week nights, each truck is time-filled with a little bit of RNG and then the tank is topped off with line [natural] gas. On weekends, however, when the trucks are parked for several nights, all 27 trucks get 100 percent RNG. The RNG has a methane content of 92 to 94 percent, whereas the line gas is slightly lower - the engines don’t know the difference.

      The tail gases (lean gas) from the biogas conditioning system, such as propane and butane, are combusted in an on-site boiler. Heat generated by the boiler is used to warm the air for the IVC tunnels and heat the percolate tank. No gas is being flared.

      The RNG has a carbon negative value of -23.95, which makes it a valuable commodity in California, which has aggressive greenhouse gas reduction requirements. This is better than any other technology out there for reducing carbon emissions from fuels. In 2015, 828 metric tons of CO2 equivalent were avoided, and about 48,000 gallons of diesel fuel displaced.

      SSFSC received about $3 million in state grants and tax credits for facility construction. Solid waste tipping fees in the Bay area are $90 to $100/ton, which contributes to the facility’s revenue stream. Recently, the company sold its first Low Carbon Fuel Standard (LCFS) credits for the RNG, which are trading at $85-$100/credit. The LCFS program is an initiative of the California Air Resources Board, which administers the state’s GHG emissions reduction programs.So far, SSFSC has not been able to tap the federal RIN market, which is part of the U.S. EPA’s Renewable Fuel Standard (RFS) incentive program for alternative fuels such as biogas (classified as an advanced biofuel).

      Right now, savings from using RNG instead of diesel fuel are not being realized. As a solid waste and organics collection company, taking this plunge made more sense when diesel fuel was $5/gallon versus $2 to $2.50/gallon. But that will go up again.


      • #18
        GlobeNewswire Dec 05, 2019 Xebec Enters California Dairy RNG Market with Maas Energy Works

        MONTREAL, Dec. 05, 2019 (GLOBE NEWSWIRE) -- Xebec Adsorption Inc. signed a letter of intent on December 4th, 2019, with Maas Energy Works for five RNG systems. Xebec will supply dairy farmers with an initial four Biostream™ container systems, each with a 280 SCFM capacity. This renewable natural gas will be injected into the California gas grid. Project delivery dates are throughout 2020.



        • #19
          Bilfinger July 04, 2019 - Small but mighty

          Natural gas must be properly treated prior to liquefaction. Independently of whether the source is biogas, landfill gas, various qualities of field or sales gas, it is fundamental to select the ideal combination of the most efficient and economical treatment technologies. The processing of the gas may include the removal of water, mercury, hydrogen sulfide, carbon dioxide, ammonia, and other components.

          The centerpiece of the actual liquefaction process is an equipment that generates high pressure and low temperatures. stored and then made available to end consumers at vehicle LNG refuelling stations or truck loading facilities, which may or may not be located on the small scale liquefaction plant’s compound.

          The importance of fuels for the mobility and transport sectors is changing. Increasingly, the trend is to develop alternatives to petrol and diesel. This re-orientation is being further accelerated by legislation which was adopted by the German Bundestag in October 2018. The law exempts lorries running on LNG from the obligation to pay tolls. As a result, major automakers have already seen a significant rise in orders for LNG-fuelled lorries.

          Alternative fuels such as LNG offer a promising technological basis for reducing the dependency on oil where mobility and transport are concerned, while concomitantly reducing greenhouse gas emissions. Natural gas is one of the most promising alternative fuels for transport by land and by sea. The technology is mature, readily available, and just as powerful as petrol or diesel, but emits fewer pollutants.



          • #20
            One of the major product lines DMT Environmental Technology offers enables biogas to be upgraded to pure methane. This can subsequently being supplied to the national gas grid or used as transport fuel.



            • #21
              Bright Biomethane produces biogas upgrading systems to upgrade biogas to biomethane using membrane technology. This animation video shows how this works.

              Bright Biomethane is EU’s leading supplier of biogas upgrading systems. Having constructed the world’s first commercial installation for upgrading biogas using a 3-stage membrane system, Bright Biomethane successfully uses this proven design in its systems operating today at more than 30 project references.

              Biogas upgrading to biomethane, also known as biogas purification, is a very attractive alternative compared to using a combined heat and power system that generates electricity and heat (without cleaning up the digester gas to pipeline specs.)




              • #22
                Smart Energy Systems: 100% Renewable Energy at a National Level in Denmark

                Energy production from wind and solar fluctuates - it fluctuates as the wind blows. So what renewables are reliable when there is no sun or wind energy available?

                Another challenge is the transport sector. How do we create an energy system of renewable energy, where also cars, ships and planes can operate on fossil-free energy?

                Mention of the utilization of natural gas occurs 12:30 into the clip: " . . combine the use of wind and solar with green gas to make this all work . . "




                • #23
                  BURNABY, British Columbia--(BUSINESS WIRE) Feb 6, 2020 --Greenlane Renewables Inc. today announced that its wholly-owned subsidiary, Greenlane Biogas North America Ltd., has signed a $5.3 million contract with Ligonier, Pennsylvania based Renewable Natural Gas Company (“RNGC”). Greenlane to supply three biogas upgrading systems, which utilize Greenlane’s proprietary water wash technology, for landfill applications in the eastern United States.

                  “We are delighted to have been selected by RNGC to provide the biogas upgrading systems for RNGC’s landfill projects where the resulting clean, low carbon renewable natural gas will be injected into the natural gas pipeline,” said Brad Douville, President & CEO of Greenlane. “Our technology is ideally suited for this application developed by RNGC to provide robust low-cost operation. We look forward to working with RNGC to make this project a success.”

                  RNGC is a developer of landfill gas to RNG projects for the transportation market. For more information please visit

                  Greenlane Renewables systems produce renewable natural gas from organic waste sources including landfills, wastewater treatment plants, dairy farms, and food waste, suitable for either injection into the natural gas grid or for direct use as vehicle fuel. Greenlane is the only biogas upgrading company offering the three main technologies: water wash, pressure swing adsorption, and membrane separation. Greenlane has over 30 years industry experience, patented proprietary technology, and over 100 biogas upgrading units supplied into 18 countries worldwide, including the world’s largest biogas upgrading facility. For further information, please visit




                  • #24
                    Brightmark Energy for BusinessWire -

                    BUSINESS WIRE Feb 5 2020 --Brightmark, a San Francisco-based waste and energy development company, announced today that it has signed a manure supply agreement with two South Dakota dairy companies, Boadwine Farms, Inc. and Moody County Dairy Limited Partnership, to capture methane produced by nearly 12,000 dairy cows and heifers and convert it into RNG which will be injected into the local interstate pipeline system for use statewide. The project is anticipated to produce 217,000 MMBtu of renewable natural gas each year, which is equivalent to the amount of gas needed to drive 2,492 vehicles for a full year. Brightmark is developing the project, and the company will also own and operate it upon completion.

                    This is the latest in a series of biogas projects launched by Brightmark in the past two years. The company also has active projects in Washington, Wisconsin, South Carolina, and New York.




                    • #25
                      Kinetrex Energy, EDL and South Side Landfill have completed the Indy High BTU plant, the largest RNG plant in Indiana, at the Indianapolis South Side Landfill. The plant, which will be fully operational March 20, 2020 will convert landfill methane gas into approximately 8 million gallons of RNG each year, which Kinetrex will turn into LNG and sell to Midwest transportation fleets.

                      Kinetrex recently signed a six-year agreement with UPS to supply the global shipping company with up to 52.5 million gallons of LNG for its Class 8, LNG-powered fleets in Chicago, Toledo, Columbus, St. Louis and Indianapolis.




                      • #26
                        INDIANAPOLIS, IN – The Greater Indiana Clean Cities Coalition presented Kinetrex Energy with its 2020 “Alternative Fuel Leader” award for the use of LNG in its fleet and its new Indy High BTU plant which produces RNG. Today’s LNG engines, which are manufactured by Indiana-based Cummins Westport, reduce NOx emissions by 90%. LNG also reduces greenhouse gas emissions by up to 20% versus the cleanest diesel engine.



                        • #27
                          Arlene Karidis for Waste360 Apr 14, 2020 - Utility FortisBC to Launch Third Landfill Renewable Gas Project

                          Utility FortisBC in British Columbia will soon launch its third and largest landfill RNG project. In partnership with the city of Vancouver, it will increase RNG the utility currently produces at the other two facilities by two-thirds, equating to another 250,000 gigajoules of gas that it will sell to customers annually.

                          The utility will own and operate the system at the Delta landfill and pay the city of Vancouver for its gas, which will go back to the municipality to fuel its compressed natural gas trucks. The gas will also be used for city buildings and for a central energy system serving residential and commercial customers in downtown Vancouver.

                          Delta landfill was selected because it serves multiple major cities, and thus is able to provide a robust feedstock supply. The site was ideal from a logistics point; the plant is located at the landfill by the gas flares, adjacent to the central part of the gas collection system, and a pipeline was installed from the system to a nearby high-pressure natural gas distribution line, says Albert Shamess, director of zero waste and resource recovery for the city of Vancouver.

                          “While the city will get some revenue, it was not our primary driver. Our primary driver was to find a higher and better use for landfill gas,” says Albert Shamess, director of zero waste and resource recovery for the city of Vancouver.

                          FortisBC’s two other biogas upgrading plants are in Salmon Arm, BC, and Kelowna, BC, which collectively generate 80,000 gigajoules per year.




                          • #28
                            Cenergy Solutions, a US-based company, in conjunction with North State Rendering Plant has captured biogas that is being made from food waste. This gas is now being moved in Cenergy’s ANG trailer to be utilized in a boiler that is preparing used cooking oil for biodiesel production. Chris Ottone plant co-owner of the biogas plant, said this could save them $3,000 to $4,00 per month which is now being spent on pipeline gas from PG&E.

                            Cenergy Solutions, CEO Gary Fanger says, “This is a game changer for the biogas industry. This raw biogas is being moved with the CO2 to a location that can utilize it in a boiler. The raw biogas can also be moved to a processing plant where it can be scrubbed and injected into the pipeline. We have now demonstrated that Cenergy’s ANG tank trailer can move stranded biogas to replace other fossil fuels in vehicles and other applications, something that has never been in a tank trailer before. Over the next two weeks we will also demonstrate that we can use ANG tanks filled with biogas and wellhead gas to replace propane usage in homes and businesses. This will help to stop the waste of our renewable and natural resources which are taking place worldwide”.

                            Cenergy’s tests on their ANG tank trailers have gone as expected with both pipeline and biogas being economically and safely stored and transported to an end use at pressures less than 265 psi. The last test was done with raw biogas that only had the moisture and H2S taken out. Cenergy has shown that the ANG tank trailer can be fast filled with a high-pressure dispenser or slow filled with a low-pressure screw pump making it versatile for many applications. The adsorption and desorption are enhanced with Cenergy’s patented ANG system making it possible to fill the ANG tank trailer quickly and dispensing it fast or slow as needed for the application that it is being used for. The natural or biogas that leaves the tank has a consistent flow down to 0 psi in the tank. There are no problems with freezing that restricts the flow or liquifying the CO2 during adsorption or desorption.



                            • #29
                              AMERESCO for BusinessWire April 28, 2020 - Phoenix RNG Plant receives award

                              Designed, built, owned, operated and maintained by Ameresco, the 91st Ave Phoenix facility is the largest wastewater treatment biogas-to-RNG facility of its kind in the United States. Using innovative, advanced energy technologies, the facility processes raw biogas generated on-site by the municipal wastewater treatment plant (WWTP) and converts it into RNG suitable for injection into the nation’s high-pressure natural gas pipeline.