SLUDGE MANAGEMENT
several years of pilot testing with our material. “We also investigated many of the 20 plants overseas, and confirmed successful operation with process operators and owners. By 2009, we completed our due-diligence and assessment work and were ready to proceed with detailed planning, design, and implementation. We found that the thermal hydrolysis process developed by Cambi has by far the most experience, especially with large plants like Blue Plains.”
Blue Plains’ 300t/d of raw dry sludge will, after AAD, produce biogas to generate 13MW of electricity in high efficiency gas turbines. There is sufficient hot
“We found that the thermal hydrolysis process developed by Cambi has by far the most experience”
gas from the turbine exhaust to produce all the medium pressure steam required for the Cambi process. This electricity saves the plant £6.2M per year and goes towards meeting DC Waters drive to reduce reliance on fossil fuels – currently 32-35MW.
Another benefit is that the plant can make a cake of about 30% dry solids (DS) using low energy belt presses. The final amount of cake will be half of current and the expected saving in recycling a further £6.2M per year. The main
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www.wardenbiomedia.com April 2011 Water & Wastewater Treatment 31
process train, consisting of pre-dewatering, 24 reactor THPs and four very large digesters, is being delivered as a design-build project that is expected to be operational by 2014. At the other extreme, the latest innovation in the Cambi THP range is the development of a compact version of the THP aimed at medium sized wastewater treatment plants. This compact version is applicable to treatment plants in the 100,000 to 500,000 population equivalent (PE) range. The Cambi compact plant in Drammen, Norway, is designed to treat about 20,000 tonnes of liquid sludge (3-4% DS) per year from
municipalities in the Drammen region (about 200,000 PE), together with some grease and septic waste. Construction started mid 2010 and the plant is scheduled to be finished in the second half of 2011.
The UK has been a test bed for AD over the past 10 years. The combination of green energy policies, good biosolids practice and regulation, and good commercial management has made the UK a world leader in this area of wastewater treatment.
DC Water engineers sniff test sludge cake at Aberdeen ADTH Plant. The cake is non smelly, safe (enhanced treated) and stackable
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