Out and about with the Master Composters
HOTBIN has been working with Master Composters and Recycling Officers for the past 12 months. We donated 15 HOTBINS to be used with various teams across the country. We were keen to get the Master Composters to try the HOTBIN and see how it compared against the other composting bins they work with.
HOTBIN composting is quite different from traditional composting methods and we knew Master Composters would definitely put the HOTBIN to the test!
What do we want to achieve via the HOTBIN project?
WRAP( July 2011) estimated there are around 7 million homes in the UK composting. About 65% of household food waste is classed as “do not add to compost bin”. Most composting is therefore adding 35% comprising mainly of vegetable peelings and tea bags from the kitchen. The HOTBIN can compost ALL food waste including meat and cooked leftovers.
If we can upgraded all home composters to compost all food waste, then that would divert an additional 1.12 million tonnes from landfill and collection. (250Kg/house x 65% x 7m households = 1.12 million mt of food waste). This equates to roughly 50 large scale AD/IVC central plants. Whilst costs vary, this is around £500 million of capital costs and 10 years of planning and building.
We clearly have a vested interest, but we think there is an environmental case for councils to subsidise the more expensive “all food waste compost bins” for those households that want them. If the government exempted compost bins from VAT (£25) and matched 3 years of food waste collection cost (£20/yr/hh), then that subsidy would allow a price point of £75 per HOTBIN! The subsidy leads to a virtuous circle – more units leads to high volume production, which reduces costs, which reduces prices again which increases volume which diverts even more. We are miles away from this – but our goal has to be large scale diversion. (If you want to read more on the benefits of hot composting topic jump to this post).
This year will see HOTBIN enter all the major Council framework agreements (ESPO/YPO/Scotland Excel) giving us more visibility and opportunity to discuss removing food waste via home composting. With the help of Recycling Officers and Master Composters we hope to divert more food waste in 2013.
HOTBIN test SITES include:
||What & Why
||2 units with Waste Recycling Officers
||4 units, 2 with Master Composters & 2 with Recycling Team
||1 unit with Waste Minimisation Officer
||1 MC – Sarah, aka ‘Compost Woman’ Follow her blog and review here
||1 unit with Master Composter
||On display Snibston recycling centre
||1 unit with waste recycling Officer
||1 unit with MC
||1 unit with MC
||1 MC & 12 Units with Waldringfield Community Composting
||1 unit with MC
||1 unit with MC
||2 Units, on display at York Rotters See St Nicks field website
|Zero waste (Scotland)
||Waste Recycling Officer
|If you would like contact details for the above, please email us at email@example.com
REMEMBER MASTER COMPOSTERS;
- Already use many different composting systems
- Work with many different users from novice to expert
- Have undergone formal compost training and accreditation
So What Do the Master Composters say ABOUT THE HOTBIN?
Jane Griffiths, MC Network Manager: The HOTBIN processed a very challenging food waste mix into compost after 90 days. During the trial we were really impressed that when checking the temperature it read 60°C when the outside temperature was around 10°C.”
Lesley Tulitt, Buckinghamshire: I got the bin going and have not looked back. The time of year is irrelevant, as the key point is to introduce a large amount of fresh greens like grass clippings which start the process and then keep adding waste every few days to maintain the temperature. As long as you keep feeding it with material it works. (Lesley recently blogged at http://recycles.buckscc.gov.uk/).
Sue Baines, Oxfordshire: The HotBin website is fascinating, I can spend hours looking at it when I think I should really be gardening, but it’s good to have access to so much information. I received the straps a couple of weeks ago and they do seem to help to hold the hatch in place. I’m still having problems with leachate, although not as much as before. …The compost in the bottom of the bin was extremely compressed and wet and seemed anaerobic and smelly although it was mainly composted…. Having said all that, I’m still getting good quantities of reasonable compost out of the bin, so I’m not complaining.
Sarah, Herefordshire (see Compost Woman – blog): I filled the bin mid afternoon on a sunny but cool day (18C). After 24 hours the top layer of material was at 50 Celsius with an ambient temperature of 20 Celsius. It was very easy to load the HotBin and so far I am impressed with the ease of use. I am also VERY impressed with the comprehensive and user friendly information on the HotBin website – especially the FAQ pages, which are full of all sorts of useful information about composting.
Rod Weston, Leicestershire (HOTBIN at Snibston Discovery Museum): The bin is attracting a lot of interest, particularly the external thermometer just about everyone has to open the lid to confirm that it is hot (60-70C) inside. We are using it to compost food waste from the on-site cafe so it is a bit of a challenge but the bin is performing well.
Betsy Reid, Suffolk: I am the satisfied owner of a HOTBIN. What I am now wondering is whether you could offer any price reduction for a Community Composting scheme?
(We did and Waldringfield is our first community Composting scheme with 12 HOTBINS last year and another 12 HOTBINs to be delivered in March 2013!).
Linton Waters, Shrewsbury: Having now experienced the HOTBIN, I’d be very happy to talk positively to members of the public at events etc and recommend it where it seems appropriate.
Hugh Baker, Compost Works, Mole Valley: Thanks for the HOTBIN – Very impressed with it.
Lessons learnt with Master Composters
Our first year has flown past, but not without challenges. Our policy is to learn and fix problems as soon as possible. Here’s a short review of issues and fixes that came up from the Master Composter testers:
Bulging doors and straps: The first batch of HOTBINS had some hatch panels that appeared to slip. We supplied cam straps to all existing and new customers and subsequently made a design revision which solved this problem.
Rats: MCs know rats can get into just about any compost bin – plastic, wood or metal. They always ask: Is it rat proof? No, but 99.5% of all customers report no issue with rats. The key defence against rat attack is the removal of odours that attract them – the HOTBIN achieves this – you can read more on rats by jumping to our rat FAQ post.
Not getting warm: a small percentage of all customers struggle to get into the hot composting zone. The % of MC who struggled was no different to customers. We solved each incident and have got them going. The causes are usually human factors (prior experience cause skipping key steps – like adding plenty of bulking agent when adding food waste or not adding enough chopped cardboard or shredded office paper with wet waste) or practical (not enough waste).
Leachate & avoiding excess water: If the mixture is too wet – leachate (brown water) comes out of the base. We now:
- Plan for occasional leachate – and ask users to check location of HOTBIN
- Advise how to minimise leachate by adding shredded cardboard or office paper to waste
Flies and maggots: A hot HOTBIN working above 40C kills flies, maggots and other critters. One MC spotted an infestation of fruit flies. We advised how to get hot composting and the flies disappeared.
Emptying: It could be easier – but also noted no harder than other compost bins.
Bulking agent, food waste and how to handle food waste: of all our challenges taking trained composters who know you should not add food waste to a compost bin and asking them to do it was hardest. Very few are trained in compost engineering and hence the theory and practise of using bulking agents and hot airflow. What we ask is counter intuitive too many aspects of cold composting – but when they get it and see it working there is an addiction and smile that at last composting can be fast and fulfil its potential for recycling.
For more information on the HOTBIN please call the HOTBIN team on 0845 6210095
We can also arange 12 HOTBINS for a community composting group purchase, you just need to find 12 friends who want to compost all food waste!
For bulk pricing and sales to Councils, please call Straight plc 0113 245 2244