environmental impact statement kilmainhamwood compost facility ...
environmental impact statement kilmainhamwood compost facility ... environmental impact statement kilmainhamwood compost facility ...
5361- Kilmainhamwood Compost Facility Extension- EIS Table 2.1 Water Management Plan Facility Area Water Use m 3 per Day Water Source Composting Building Facility Administration Building Washing Requirements Washing Requirements and Potable Water 27 0.6 0.3 Rainwater Storage Tank On Site Borehole (BH3) The capacity of the rainwater storage tank is 36m 3 . Given that: � The rainwater storage tank can provide wash water requirements for a dry weather period of 60 days; and � 4.5mm of rainfall will replenish the tank on the basis of a total roofed area of 7961m 2 ; It is reasonable to assume that all water usage for washing requirements within the composting building can be provided by collection of rainfall. An onsite water treatment plant is proposed at the point of entry to the facility administration building to treat the borehole (BH3) supply to drinking water standards. It is proposed to provide a package plant in the Tea Station providing chlorination and filtration. Surplus roof rainwater will overflow from the rainwater storage tank to the roof water sewer and will combine with the yard water sewer (downstream of the oil interceptor). The green field runoff rate to the existing drainage ditch will be controlled by a hydrobrake. An overflow, downstream of the oil interceptor, will discharge into a proposed attenuation area as shown on Drawing No. 5361-2402. 2.5.7 Odour Abatement System The odour abatement system currently in operation at the Kilmainhamwood Compost facility involves biofiltration. Biofilter Principle For inspection purposes only. Consent of copyright owner required for any other use. It is widely accepted that the wide range of micro-organisms found in soils can oxidise many compounds, including both volatile organic compounds and other odourous compounds. Prepared beds have therefore been used for odour control for about 40 years. With adequate construction and maintenance of biofilter beds, they can be very effective for odour abatement. Mixtures of porous, well structured material with some compost are typically used and the bed is kept open by turning the top layer two or three times per year. Adequate bottom drainage is essential, as is the facility to keep the bed moist in dry weather. The residence time in a biofilter depends largely on the substrate. For most odorous air or gases, a residence time of approximately 28 seconds is required. The typical height of biofilter beds is 1 to 2 metres, so that a linear flow rate of approximately 130 m3 (h) (m2) is provided. Greater bed heights will EPA Export 01-06-2010:03:55:51
5361- Kilmainhamwood Compost Facility Extension- EIS decrease the ground area required and hence the bed cost, but at the expense of higher power costs due to greater bed resistance (greater pressure drop across the bed). Existing Biofilters at the Facility The existing 2 No. biofilters at the Kilmainhamwood Compost facility comprise of a firm concrete floor and surrounding concrete walls. The floor has a fall towards a drained sump situated at one end of the chamber for water drainage. A false floor acts as the support for the biofilter media. The sump liquid is pumped back to the waste reception area within the composting building. The incoming air has a high relative humidity to provide a suitably moist surface for the microorganisms. The bed media consists of a combination of woodchip and carbon media mix. This media provides a large available (external and internal) surface for the microbes and an adequate supply of nutrients, while being sufficiently permeable to allow for a reasonably fast air flow rate without excessive pressure drop (both after initial construction and following settlement of the biofilter media). The bed pressure drop is a most important parameter, since the power required to pass the air through the bed is often the largest component of the total operating cost. The odour abatement system currently in operation at the Kilmainhamwood Compost facility consists of three 37kW extraction fans that extract a total of 101,000m 3 of air per hour. This volume of odourous air is processed by two biofilters. One biofilter processes the air stream generated by one 37 kW fan (38,000 m3/hour) and the other biofilter processes the air stream generated by two fans (63,000 m 3 /hour). Each biofilter is 23.5m long, 16.5m wide and 2.1m high. A sump pump pumps rainwater and condensate from the biofilter into the waste reception area where it is added to the compost feedstock. The biofilter is completely sealed preventing the release of rainwater and condensate. For inspection purposes only. Consent of copyright owner required for any other use. Details of the proposed upgrade to the Kilmainhamwood Compost facility odour abatement system are provided in Section 2.2. 28 EPA Export 01-06-2010:03:55:51
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5361- Kilmainhamwood Compost Facility Extension- EIS<br />
decrease the ground area required and hence the bed cost, but at the expense of higher power costs<br />
due to greater bed resistance (greater pressure drop across the bed).<br />
Existing Biofilters at the Facility<br />
The existing 2 No. biofilters at the Kilmainhamwood Compost <strong>facility</strong> comprise of a firm concrete floor<br />
and surrounding concrete walls. The floor has a fall towards a drained sump situated at one end of the<br />
chamber for water drainage. A false floor acts as the support for the biofilter media. The sump liquid is<br />
pumped back to the waste reception area within the <strong>compost</strong>ing building.<br />
The incoming air has a high relative humidity to provide a suitably moist surface for the microorganisms.<br />
The bed media consists of a combination of woodchip and carbon media mix. This media<br />
provides a large available (external and internal) surface for the microbes and an adequate supply of<br />
nutrients, while being sufficiently permeable to allow for a reasonably fast air flow rate without<br />
excessive pressure drop (both after initial construction and following settlement of the biofilter media).<br />
The bed pressure drop is a most important parameter, since the power required to pass the air through<br />
the bed is often the largest component of the total operating cost.<br />
The odour abatement system currently in operation at the Kilmainhamwood Compost <strong>facility</strong> consists of<br />
three 37kW extraction fans that extract a total of 101,000m 3 of air per hour. This volume of odourous air<br />
is processed by two biofilters. One biofilter processes the air stream generated by one 37 kW fan<br />
(38,000 m3/hour) and the other biofilter processes the air stream generated by two fans (63,000<br />
m 3 /hour). Each biofilter is 23.5m long, 16.5m wide and 2.1m high.<br />
A sump pump pumps rainwater and condensate from the biofilter into the waste reception area where it<br />
is added to the <strong>compost</strong> feedstock. The biofilter is completely sealed preventing the release of<br />
rainwater and condensate.<br />
For inspection purposes only.<br />
Consent of copyright owner required for any other use.<br />
Details of the proposed upgrade to the Kilmainhamwood Compost <strong>facility</strong> odour abatement system<br />
are provided in Section 2.2.<br />
28<br />
EPA Export 01-06-2010:03:55:51
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