Municipal organic waste treatment and resource utilization solution

Kitchen waste treatment and resource utilization solutions consist of a set of processes, such as waste pretreatment, dry anaerobic digestion fermentation, biogas residue/slurry treatment, etc. In combination with the existing waste treatment technology featuring resource recycling, innocent treatment and minimization, the solutions can be used to deal with municipal waste in a more effective, economical and environment-friendly way.

The core process of the system, tunnel kiln dry anaerobic digestion fermentation, represents the sole solution to dealing with municipal organic waste with complicated components and the only technology of recycling-based waste treatment of biogas generated from anaerobic digestion fermentation.

Resource utilization of municipal organic waste consists of process, like pretreatment, dry anaerobic fermentation, residue/slurry treatment, etc. is a more effective, economical and environment-friendly way to deal with the MSW.

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Dry Anaerobic Fermentation

Municipal organic waste resource treatment solutions consist of a set of processes, such as waste pre-sorting, dry anaerobic digestion fermentation, biogas residue/slurry treatment, etc. In combination with the existing waste treatment technology featuring resource recycling, innocent treatment and minimization, the solutions can be used to deal with municipal waste in a more effective, economical and environment-friendly way.

The corn process - tunnel kiln dry anaerobic fermentation technology, represents the sole safe and reasonable solution to dealing with municipal organic waste with complicated components while generating biogas.

  • Turnkey projects are customized according to the up-to-date treatment and technical solutions.
  • Experienced teams with Sino-Germany cultural backgrounds ensure the safe implementation of projects.
  • Over 20 years of experience in project operation and can provide one-stop service from design, installation to commissioning and operation, with more than 120 project cases in the world.
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Kitchen waste

The China's kitchen waste is consists of 70% to 85% organic matters and is directly sent to incineration plants or landfills nowadays, which may easily cause problems such as low resource recycling, percolate, odor gas and large carbon emission etc. Our solution takes complicated components in China's municipal organic waste into full account. While ensuring safe and stable operation of anaerobic digestion process, the high-moisture degradable kitchen waste is separated from municipal waste, for anaerobic digestion fermentation and also the low-moisture and the rest high-caloric-value components for incineration and power generation. Residues are then sent to landfills for final disposal.

Considering of the complicated components in China's municipal organic waste, our solution can ensure the safe and stable operation of anaerobic fermentation, and has less problem with percolate, odor gas and large carbon emission.

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Pretreatment

By waste pretreatment, it means sorting from waste the recyclables (such as plastics, textiles, mental, glass, etc.) and non-recyclables (such as bricks, tiles, ceramics, bamboo, etc.) that affect stable operation and fermentation stability of anaerobic digestion fermentation equipment, by following procedures of bag breaking, manual sorting, magnetic sorting, screening, air separator, etc. After being processed, the sorted organic matters are fed into the fermentation tank via the plunger pump for anaerobic digestion fermentation.

Through pretreatment, the recyclable and non-recyclable parts will be sorted out. The separated organic matters are fed into the fermentation tank via the plunger pump for anaerobic fermentation.

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Tunnel Fermentation System

Kitchen waste is pre-processed into the waste materials with a diameter of less than 80mm and consisting 30% to 35% solids, which enter tunnel fermentation in a horizontal plugs flow way. The paddle agitator in the tank stirs materials at a low speed so as to ensure the optimum agitation of fermentation materials and increase gas output. The heating systems fixed on the seat and tank wall can maintain a constant temperature of 55°C inside the tank, which could ensure the best fermentation conditions and disinfect materials at high temperature. With an average of 21 days’ anaerobic digestion fermentation, organic matters are completely graded; biogas is generated, which can be further refined into natural gas.

Material Size: smaller than 80 mm, Solid Content: 30-35 %, Reaction Temperature: 55°C, Reaction Time: average 21 days, to make sure the completely fermentation of organic matters

  • The waste materials with 30% to 35% solids can be processed.
  • A single tunnel kiln can process 100t organic waste at most every day.
  • Solving the problems of low recycling efficiency, percolate, odor gas and large carbon footprint that exist in other solutions.
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Equipment Parameters

  • The tank is 35*10*10m (L*H*W) and has an effective volume of 2,250m³.
  • The annual treatment of municipal waste exceeds 35,000t.
  • The biogas production rate is about 110 to 120m³/t, with a methane content of 58% to 60%.
  • Modular equipment, which can be designed in parallel in multiple tunnel kilns according to demand.
  • The agitator is driven by 18.5kW motor, with low energy consumption.
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Typical Reference

With a combination of waste incineration and anaerobic digestion, the plant has received a good collaboration effect: on the one hand, the residual heat generated from waste incineration can be used as the heating resource for anaerobic digestion fermentation at high temperature; on the other hand, the exhaust gas collected from both front and rear ends of anaerobic digestion fermentation can be supplied to the incinerator for burning, and some biogas slurry can be used to cool down the temperature in the incinerator. The combustibles obtained through waste pre-sorting and screening as well as the impurities generated during the biogas slurry composting process could be sent to the incinerator. Also, two system can share personnel, vehicles and some infrastructures at the same time.

  • Project site: Augsburg, Germany
  • Year of launching: 2013 (Phase I)/2016 (Phase II)
  • Materials: municipal waste, medical waste
  • Treatment capacity: 75,000t/y
  • Output of liquid organic fertilizer: 17,600t/y; output of solid organic fertilizer: 15,900t/y; 8,000,000m³/y

System Advantages

Materials may contain up to 30% solids; high gas production rate per unit volume and small footprint.

  • The patented agitator design ensures complete mixing and safe operation of floating and submersed materials. Its rational arrangement can further guarantee the complete fermentation and operation of materials inside the tank and prevent the blockage of material outlet.
  • The agitator is driven by a18.5kW motor, with low energy consumption.
  • Equipment inside the tank is maintenance free for 30 years. The machines, motors and supporting equipment that require regular maintenance are all outside the tank. Normal fermentation inside the tank will not be affected during the maintenance period.
  • Up to 95% waste can be degraded, free of secondary emission and pollution.
  • With modular design and flexible extension, the system may be deemed as an ideal solution for combining the current landfilling and incineration solutions.
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Project Revenue

  • Reduction of waste by anaerobic fermentation without secondary pollution.
  • The project is entitled to government waste subsidy.
  • Electrical power generation after biogas purification: The generated biogas may be supplied by co-generation unit to generate electricity, which will be supplied to the utility's power grid for sales or self-use.
  • Biogas purification: Biogas may be purified and refined into natural gas, and supplied to the utility's gas grid or to gas station (CNG, LNG).
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