environmental impact statement kilmainhamwood compost facility ...

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5361- Kilmainhamwood Compost Facility Extension- EIS • In the event of a fire any excess firewater within the compost building will be contained within the building. This firewater will subsequently be analysed prior to possible tankering off-site to an approved wastewater plant. With regard to the extended facility building, a fire safety certificate will be secured from Meath County Council Fire Department. The design of the facility building extensions is in accordance with Technical Guidance Document B of the Building Regulations. 2.6.4 Litter Control The following measures are employed at the site to control litter: • All waste entering the facility is covered. Thorntons Recycling excludes any contractor failing to comply with this requirement from entering the site; • The approach roads to the site are monitored on at least a daily basis and in the event of litter being found on these roads, site staff promptly remove it and deposit it in an appropriate manner; • The waste that will be composted on site will consist of separately collected biowaste, which contains only very limited amounts of components that could potentially cause litter problems (e.g. plastic, paper). • Waste will only be stored within the facility buildings. • Residues hauled to landfill from the composting facility will be in covered vehicles; • All site areas will be inspected and cleaned regularly. • The facility has access to a road sweeper when required. 2.6.5 Odour Control The main reasons for the occurrence of nuisance odour emissions from composting facilities are: • Existence of anaerobic conditions in the fresh biowaste or in the composting material; • Composition of the biowaste in the composting process, especially: o High concentrations of sulphur containing materials; o High concentrations of nitrogen containing components causing ammonia emissions; • Temperatures in the composting process exceeding 65°C; • Ineffective odour abatement system; For inspection purposes only. Consent of copyright owner required for any other use. Consequently, the main measures for reducing odour emissions can be divided into five categories: 1. Management of the fresh biowaste handling and influencing the composition of the material fed into the composting process 2. Prevention of anaerobic conditions, i.e. allow sufficient active aeration of the composting material and prevention of very wet process conditions; 3. Monitoring and maintaining of temperature below 65°C; 4. Application of emission reduction techniques; 5. Implementation of an effective odour abatement system specifically designed for the 35 EPA Export 01-06-2010:03:55:52
5361- Kilmainhamwood Compost Facility Extension- EIS composting process and feedstock to Best Available Techniques (BAT); Management of fresh biowaste and material composition Fresh biowaste as delivered to the facility is likely to be partially anaerobic, due to storage at the location of production and transport. As long as the biowaste is contained in a waste collection/transport vehicle this will not lead to emissions, since the material is not being handled/disturbed. However, unloading of the material at the site and further handling may lead to odour emissions. To prevent emissions to the surroundings, all biowaste is discharged into the facility building which is under negative pressure with roller shutter doors closed at all times. The mixing of the biowaste prior to composting is executed in the same enclosed building. The building is equipped with air ducts on the underside of the roof, which collect the air and transport the air to a biofilter. As part of the upgrade of the odour abatement system, it is proposed that the composting bays are enclosed and the process air is treated in an ammonia acid scrubber prior to biofiltration. Since the building is under negative pressure, the emissions via open doors are minimised when accepting incoming biowaste. To prevent delivered biowaste from getting anaerobic and odorous, all biowaste is pre-treated and placed into the composting bays within one day of arrival and acceptance at the facility. Appropriate mixing of feedstock and amendment materials (carried out in enclosed building under negative pressure) prior to composting is required to allow for a proper composting process and for the production of the desired quality compost. However this mixing is also essential to minimise odour emissions. The mixing ensures that the composting mass: • Has the appropriate dry solids content (approximately 45%-35%) and has an adequate porosity, such as to facilitate the aeration process and prevent the formation of anaerobic zones in the composting mass during the process. This is achieved by mixing relatively dry and wet feedstock and if required, the adding of a structure material e.g. wood chips; For inspection purposes only. Consent of copyright owner required for any other use. • Has the appropriate C/N-ratio (approximately 25/30:1) to prevent excessive emissions of Ncontaining odour components. This is achieved by mixing feedstock which is low in N-content (e.g. green waste) with feedstock that has a higher N-content (household biowaste); Aeration of composting material The first stage of composting is the most critical with respect to odour emissions, since easily biodegradable components, e.g. sugars, proteins and fats are degraded at a high rate, thus causing gaseous by-products. The entire composting process is executed in an enclosed composting building which is maintained under negative pressure. The interior of the building is coated with an expanded foam membrane sealing to provide near complete sealing. Applying a high aeration rate, thus ensuring the supply of sufficient oxygen to the composting mass, prevents occurrence of anaerobic conditions in the first phase of the composting process in the composting bays. As the composting process proceeds in the 36 EPA Export 01-06-2010:03:55:52
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