RECYCLING
HRS HELPS MUNTONS SLASH 1159 TONNES OF CO2 PA
M
alted ingredients company Muntons (Stowmarket, Suffolk) is putting the finishing touches to
its £5.4m on-site anaerobic digestion (AD)
plant which will help reduce the firm’s CO2 emissions from 27,264 to 26,605 tonnes pa. Integral to the success of the 499 kW facility is a 3 Tank Batch Sludge Pasteuriser System with Energy Recovery from HRS Heat Exchangers, which will help convert up-to 80,000 tonnes of Muntons’ liquid malt waste into quality organic fertiliser (known as digestate). This will be used on local farmland, helping the company’s network of growers to produce some of the 250,000 tonnes of barley needed to make Muntons’ malt, around 180,000 tonnes pa. Muntons is a company with
sustainability at its core. It became interested in AD after analysis showed that 60% of the carbon footprint of its supply chain came from the artificial fertiliser used by its barley growers. The firm realised that using its liquid malt waste as feedstock for an on-site AD plant would not only produce a high quality digestate for its farmers to use instead of artificial fertiliser, it would also cut 3,000 tanker movements per year and
generate 25% of the site’s electricity demand. To satisfy growers’
need for a high quality fertiliser, the digestate will be pasteurised to meet stringent PAS 110 standards using the HRS Heat Exchangers 3 Tank Batch system. As well as a comprehensive proposal, the Muntons’ team was impressed by the HRS system, which can save up to 70% of heat required, as well as its ability to run at a half flow rate, should the volume of digestate stock reduce. Additionally, the equipment’s monitoring feature enables Muntons to track every batch of digestate back to the feedstock from which it was produced. “The fact that the HRS system offers batch reporting was also a big draw; traceability is very important to us,” remarks Lawrence Howes, Project Engineer at Muntons. The HRS system works on a three tank
principle; while one tank is being filled, the second tank holds the sludge at 70°C at the same time as the third tank is being emptied (each process lasts one hour). Waste cooling water from the CHP engine is used to heat the sludge in corrugated tube-in-tube heat
exchangers, which is more efficient than heating an entire tank of digestate. HRS has also incorporated an energy recovery section into the process to make it even more efficient: energy is transferred from the hotter (pasteurised) sludge to the colder (unpasteurised) sludge, reducing energy consumption by up to 70% compared to normal systems and using heat which would otherwise be wasted. The AD plant is currently undergoing
commissioning and will become fully operational in late spring. For Muntons, the benefits are clear – better waste management, a reduction in tanker movements, energy generation, and a PAS 110 quality pasteurised digestate. All in all Muntons has significantly reduced its
carbon footprint saving 1159 tonnes of CO2 pa (from 27,264 to 26,605) – the emission equivalent of 300 average family cars (approx.).
www.hrs-heatexchangers.com
NI WATER APPOINTS CDENVIRO TO THEIR FRAMEWORK FOR GRIT REMOVAL AND TREATMENT SYSTEMS
IF005 Screens Framework for Grit Removal and Treatment Systems with its S:MAX sludge screening unit. CDEnviro has successfully met the NI Water qualification process for grit
C
ookstown company CDEnviro has been appointed onto the Northern Ireland Water’s
removal and treatment systems and has been identified as a suitably qualified and experienced supplier in this sector. This acceptance to the framework has been based on meeting strict requirements in relation to financial stability, health and safety, environmental and quality standards. CDEnviro will now be invited to tender for all relevant NI Water projects. The CDEnviro equipment that will
be supplied will be the S:MAX sludge screening unit. The S:Max is currently in operation with some of the major water utilities in the UK and is delivering industry leading screenings capture. The 3 models that will be supplied to NI Water are the S:MAX SRU:10, S:MAX SRU:15 and S:MAX SRU:25. The S:Max screenings removal
unit is designed to handle a variety of materials including sewage sludge
(primary and imported), septic tank sludge and industrial sludge with the specific aim of reducing screenings content in these materials. It represents a significant development of the technology available to the sludge screening market offering operators enhanced health and safety on site, greater operational efficiencies, maximum screenings removal and minimal operator intervention. Stephen Truesdale, Head of Integrated
Procurement at Northern Ireland Water commented “CDEnviro was selected for appointment to the new IF005 Screens Framework following a rigorous tender and evaluation process. NI Water is delighted to have CDEnviro on board and looks forward to working with this locally based company for the provision of screening equipment going forward”
www.cdenviro.com
Bulk Solids Today
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