§ Mr. Crouchasked the Secretary of State for the Environment what are the limits in parts per million permitted for the sulphides content in industrial effluent delivered into town sewage systems by industrial concerns, in particular from tanneries; and what variation there is in these limits according to the sewage treatment process used.
§ Mr. Michael HeseltineI regret that this information is not available. Any48W such limit would be fixed by the individual local sewerage authority.
§ Mr. Crouchasked the Secretary of State for the Environment what instructions are issued to local authorities regarding the installation of new sewage plants with particular regard to the suitability of different processes for different conditions, both in the type of sewage to be treated and the geographical conditions.
§ Mr. Michael HeseltineNone. This is a matter for the individual local authority, though my Directorate of Engineering offers advice and guidance in particular cases.