City of Bentonville
Bentonville, Arkansas, USA · Since 2023
The city moved its biosolids from open windrows to six BROME 632 composters. Two years later: up to 90% less odour, zero complaints and double the capacity.
- Sector
- Municipal & Industrial
- Application
- Municipal biosolids, Composting sites
- Location
- Bentonville, Arkansas, USA
- In operation since
- 2023
- System
- 6 × BROME 632 composters
- Scale
- 20+ tons of biosolids per week
- Up to 90%less odour impact, zero complaints
- 2×treatment capacity, from ~600 to ~1,200 tonnes a year
- Class AEPA biosolids standard reached
- 2,500+metric tons site
With landfill and incineration no longer an option for its biosolids, Bentonville composted them in aerated windrows on about 10 acres, turned with a SCARAB machine. The site processed around 600 tonnes of biosolids a year.
Windrows depended on the weather, needed a lot of space and labour, and generated odours and complaints from neighbours, while equipment was ageing and population growth kept increasing the volumes.
The project had three goals: renovate the existing composting site, reduce its footprint, and radically reduce odour problems.
The solutionBrome Compost designed a made-to-measure in-vessel system of six BROME 632 rotating composters, fed automatically by an industrial mixer and a set of conveyors. The mixer homogenizes the material and reduces its volume before composting. At the exit, conveyors carry the compost to a pile for maturation.
The system handles more than 20 tons of biosolids a week, year-round, with controlled temperature, moisture and residence time and 8 to 9 day treatment cycles. It was phased in after pilot testing.
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