Abstract The feasibility of applying activated sludge processes to slaughterhouse effluents with the object of resource recovery as well as treatment was examined on a laboratory scale. Optimizing the food: micro-organism (F:M) ratio for maximum biomass production resulted in a fourfold reduction of the respiratory oxygen requirement when compared with a conventionally loaded activated sludge system. Maximum biomass was produced with only a slight reduction in COD removal efficiency compared with the classical system, and the release of plant nutrients was much lower. Approximately 70% of the feed COD could be recovered as biomass having a crude protein content of 50–55% of dry weight. Amino acid analyses of the recovered protein indicated that it had nutritional value and was deficient only in sulphur amino acids. A first order economic analysis suggests that the optimized treatment/recovery process could be self supporting from the sale of recovered biomass.
[1]
R. Markham,et al.
A steam distillation apparatus suitable for micro-Kjeldahl analysis.
,
1942,
The Biochemical journal.
[2]
F. W. Gilcreas,et al.
Standard methods for the examination of water and waste water.
,
1966,
American journal of public health and the nation's health.
[3]
F. Smith,et al.
Colorimetric Method for Determination of Sugars and Related Substances
,
1956
.
[4]
T. Mcmeekin,et al.
A NEW DIRECT NESSLERIZATION MICRO-KJELDAHL METHOD AND A MODIFICATION OF THE NESSLER-FOLIN REAGENT FOR AMMONIA
,
1924
.
[5]
R. Kihlberg.
The microbe as a source of food.
,
1972,
Annual review of microbiology.
[6]
A. F. Gaudy,et al.
USE OF CHEMICAL OXYGEN DEMAND VALUES OF BACTERIAL CELLS IN WASTE-WATER PURIFICATION.
,
1964,
Applied microbiology.