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Anaerobic digestion of flotation sludges from the alginic acid extraction process
AbstractThis study investigates the continuous anaerobic digestion of the flotation sludges, one of the wastes of the alginate production industry. Experiments were made in six liter digesters. The temperature was 37°C and manual loading was carried out once a day. Four retention times were studied: 20, 15, 10 and 7·5 days in the completely stirred anaerobic reactor. A conversion yield of 0·27 m3 CH4kg−1 VSo with a Volatile Solids reduction of 45% was reached at a 7·5 days retention time.The use of another design of digester, which promotes the solids retention time at the expense of the hydraulic retention time, did not improve the conversion yield of the flotation sludges and even decreased it. The anaerobic digestion of flocculated sludges was completely impossible without nutrient addition (mineral solution or pig manure). It was concluded from these results that the mixing of the sludge liquid fraction and solid phase is absolutely necessary for the steady anaerobic treatment of the flotation sludges.
Anaerobic digestion of flotation sludges from the alginic acid extraction process
AbstractThis study investigates the continuous anaerobic digestion of the flotation sludges, one of the wastes of the alginate production industry. Experiments were made in six liter digesters. The temperature was 37°C and manual loading was carried out once a day. Four retention times were studied: 20, 15, 10 and 7·5 days in the completely stirred anaerobic reactor. A conversion yield of 0·27 m3 CH4kg−1 VSo with a Volatile Solids reduction of 45% was reached at a 7·5 days retention time.The use of another design of digester, which promotes the solids retention time at the expense of the hydraulic retention time, did not improve the conversion yield of the flotation sludges and even decreased it. The anaerobic digestion of flocculated sludges was completely impossible without nutrient addition (mineral solution or pig manure). It was concluded from these results that the mixing of the sludge liquid fraction and solid phase is absolutely necessary for the steady anaerobic treatment of the flotation sludges.
Anaerobic digestion of flotation sludges from the alginic acid extraction process
Carpentier, B. (author) / Festino, C. (author) / Aubart, C. (author)
Biological Wastes ; 23 ; 269-278
1987-07-23
10 pages
Article (Journal)
Electronic Resource
English
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