Small scale water purification plant comprises preclarification tank and post-clarification tank, sludge recycling pipe leading from funnel-shaped sludge collector at bottom of post-clarification tank to preclarification tank

摘要

Small scale water purification plant comprises a preclarification tank (1) and a post-clarification tank (3). A sludge recycling pipe (10) leads from a funnel-shaped sludge collector (13) at the bottom of the post-clarification tank to the preclarification tank. The inlet of the recycling pipe has an inverted funnel shape (14).