Some of the effluents from the sewage purification systems covered by this report show quite marked seasonal variations. No assurance can be given that the effluents would meet promulgated standards from season to season. The effluent from stabilization ponds will, in summer, contain high concentrations of algae, whereas in winter high ammonia concentrations will be found
Reference:
Meiring, PGJ, Drews, RJLC, Van Eck, H and Stander, GJ. 1968. Guide to the use of pond systems in South Africa for the purification of raw and partially treated sewage. CSIR Special Report WAT 34
Meiring, P., Drews, R., Van Eck, H., & Stander, G. (1968). Guide to the use of pond systems in South Africa for the purification of raw and partially treated sewage (UDC). CSIR. Retrieved from http://hdl.handle.net/10204/4477
Meiring, PGJ, RJLC Drews, H Van Eck, and GJ Stander Guide to the use of pond systems in South Africa for the purification of raw and partially treated sewage. UDC. CSIR, 1968. http://hdl.handle.net/10204/4477
Meiring P, Drews R, Van Eck H, Stander G. Guide to the use of pond systems in South Africa for the purification of raw and partially treated sewage. 1968 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/4477
CSIR Special Report WAT 34, January 1968. This report has since been in great demand. It has also been reprinted for the Jerusalem International Conference on Water Quality and Pollution Research, June 1969, and further reprints were made by the Ann Arbor Science Publishers, Inc., PO Box 1425, Michigan 48106, USA