HC Deb 02 August 1966 vol 733 c92W
Mr. Brian Harrison

asked the Minister of Technology whether the Water Pollution Research Laboratories are investigating the efficiency and reliability of contact stabilisation treatment plants; and whether he will make a statement.

Mr. Benn

Yes: An investigation has been carried out and others are likely to follow. It is known from basic studies, that the efficiency of the process, like others of a similar kind, is dependent partly on the sewage being treated and partly on the detail design of the plant.