| 摘要 |
AN UNTREATED FLOW OF WASTE WATER TO BE TREATED IS NORMALLY INTRODUCED INTO A PLAIN SEDIMENTATION UNIT (2) DURING PLAIN SEDIMENTATION PERIODS TO SEPARATE IT INTO SAND AND A FLOW TREATED BY PLAIN SEDIMENTATION .DURING OTHER PERIODS, FOR EXAMPLE PERIODS OF HEAVY RAIN, HIGH WATER DEMAND OR FLOODING, A COAGULATING AGENT, BALLAST SAND AND A FLOCCULATING AGENT ARE INTRODUCED. THE COAGULATED FLOW IS PASSED INTO A MATURATION INTERMEDIATE AREA (14) AND THEN, WITH SUBSTANTIALLY ALL THE SAND AND COLLOIDS OF PARTICLES ATTACHED TO IT, INTO THE PLAIN SEDIMENTATION UNIT, WHERE EFFLUENT IS SEPARATED BY PLAIN SEDIMENTATION AND EVACUATED AND SLUDGE MADE UP OF THE SAND AND THE ADHERING COLLOIDS AND PARTICLES IS EXTRACTED AND EVACUATED VIA EXTRACTION MEANS (22) AND THE SAND OUTLET CHANNEL (51) OF THE PLAIN SEDIMENTATION UNIT; THE SLUDGE IS COLLECTED, THE BALLAST SAND IS SEPARATED FROM IT (54, 63) TO BE RECYCLED INTO THE SAND INJECTION AREA AND THE SLUDGE AND EXCESS SAND ARE EXTRACTED. |
