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In-vessel Composting – Retracta Roof IVC
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In-Vessel Composting Systems
Wasteology FAQ'sComposting FAQ's

 

The In-Vessel Composting Process FAQ's

A number of factors are important in controlling the composting process and the time that the process takes. These factors include temperature, moisture, oxygen, particle size, the carbon-to-nitrogen ratio of the waste and the degree of mixing or turning involved. In general, the more actively these factors are controlled, the faster the process.

1. Is the Wasteology system ABPR compliant?

2. Has the Wasteology system achieved the ABPR licence?

3. Can potential customers view an approved site?

4. Can we help with obtaining licences and relevant permissions?

5. Can Wasteology organise a full turn-key service?

6. Does the Wasteology system carry any warranties?

7. What are the dimensions of each vessel?

8. How much does each vessel hold?

9. How long does the composting process take using the Wasteology system?

10. Does composting cause odours or attract rodents?

11. Can I compost in the winter?

AIR SYSTEM

12. Do the air ducts stay clean?

13. Where and how are the air ducts situated?

14. Do the air duct get damaged by loading shovels?

15. What size are the fans for the aeration system?

WATER SYSTEM

16. Is the rain water kept separate?

17. Is all the leachate re-used?

18. What happens to the finished compost?


1. Is the Wasteology system ABPR compliant?

Yes. Our Wasteology in-vessel system was designed from the start to meet current UK and EU rules. Operational procedures have to be strictly carried out and maintained. (Top)

2. Has the Wasteology system achieved the ABPR licence?

To date our clients have achieved 100% record in obtaining the necessary validation, under UK Regulations and using the two Barrier system. Please note proper procedures have to be put in place and maintained to satisfy SVS regulations. We are please to recommend the services of our independent consultant Mr Ian Paton who has considerable experience and knowledge in this field. (Top)

3. Can potential customers view an approved site?

We are happy to arrange a visit to an approved site in the UK by appointment. (Top)

4. Can we help with obtaining licences and relevant permissions?

We prefer to recommend our associated consultants who have many years experience within the waste industry. (Top)


5. Can Wasteology organise a full turn-key service?

We are in a position to offer a full service, from obtaining planning, Waste Management Licence, HACCP’s and SVS approval, through to construction and full commissioning. (Top)

6. Does the Wasteology system carry any warranties?

The system comes with a one year parts warranty. The PVC covers have a five year warranty which decreases in value with time. (Top)

7. What are the dimensions of each vessel?

Each clamp is 8 metres wide by 15 metres long by 2.5 metres high, to the walls. (Top)

8. How much does each vessel hold?

The cubic capacity of the vessel is approximately 330 cubic metres. The typical weight approx 150 – 170 tonnes depending on the bulk density and content of the material composted. (Top)

9. How long does the composting process take using the Wasteology system?

This is very much dependant on the final use of the compost. For example, for agricultural use, two weeks in-vessel composting followed by six to eight weeks maturation will be sufficient. It should also be noted that the length of time within the in-vessel system is dictated by the requirements of the ABPR. Under a two Barrier system and using the time/temperature criteria of 60°C for 2 days in both barriers, the material is shreded and put into a vessel for one week, Barrier 1, and then transferred into a second vessel for a further week, Barrier 2. The material is then removed from barrier 2 and is then matured on a maturation pad for a further six to eight weeks. (Top)

10. Does composting cause odours or attract rodents?

The Wasteology system does not attract rodents or birds as the waste is received and pre-processed in a building and then composted for approximately two weeks in fully enclosed clamps. It should be noted that under the ABPR, rodents and birds must be excluded from the waste and site. The SVS and Trading Standard Officers regularly inspect sites to ensure this occurs. Any waste management facility, including a composting site, has the potential to generate offensive odours usually due to the feedstock or inadequate aeration or excessive moisture. Close monitoring of these factors can usually help to minimize odours. Facilities can employ abatement systems, such as bio-filters, to treat occasional odours. Trials have been carried out where the oxygen levels have been monitored within the clamps in at least three different points around the clamp, all at the waste surface. This was carried out in both barriers and averaged 16 %, more than sufficient for the biological process. This results in temperatures of 65 to 70°C being achieved in both barriers. (Top)

11. Can I compost in the winter?

Yes. We have not had any problems with the Wasteology in-vessel system. Providing the waste composition is correct then the micro-biological system will produce temperatures in excess of 60°C as required by the ABPR. (Top)


AIR SYSTEM

12. Do the air ducts stay clean?

Yes – our top priority was to design a system that stayed clean all of the time in all conditions. The patented system has proven itself successful in daily use for the past two years. (Top)

13. Where and how are the air ducts situated?

No special concrete form work or ducting needs to be carried out as our air system bolts on to the top of the concrete pad. (Top)


14. Do the air ducts get damaged by loading shovels?

No, the air ducts are of a design that can withstand the weight of a loading shovel. The air ducts are also designed to allow the loading shovel bucket to glide over the top. (Top)


15. What size are the fans units for the aeration system?

The fans that are used have a 4kw motor drawing approx. 7.11 amps, only one is needed for each vessel. (Top)


WATER SYSTEM

16. Is the rain water kept separate?

Yes, the rain water that comes off the roof is collected in the gutter either side of the roof and then directed either to a tank or possibly into the clean water drainage system. Several clients are using this water as wash-down water to clean the site on a daily basis as part of their ABPR approval scheme. (Top)

17. Is all the leachate re-used?

The leachate that is produced from the vessels is directed into a sump and than pumped to a holding tank. From the holding tank the leachate can then be applied to the incoming material after it has been shred. In most cases all the leachate is re-used. (Top)


FINISHED COMPOST

18. What happens to the finished compost?

Applications are normally agriculture, horticulture and replacement for peat compost. A very good source of information on typical quality of the compost and also case studies of its use can be found at www.wrap.org.uk.

It should be noted that before using the compost, checks should be made to ensure that it complies with any requirements or restrictions that the various environmental agencies may apply. For example, in Scotland compost can be used unrestrictedly providing it passes PAS 100 or similar specifications. When using the compost any restrictions or conditions required by law, such as the ABPR, have to be adhered to. (Top)

 

 

 

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