XN000022-1977-01-30 — Page 3

SUNDAY, JANUARY 30, 1977

THE INTERIM PLANT IS DUE TO COME INTO OPERATION IN MAY BUT IT WILL HAVE A RELATIVELY SHORT LIFE SPAN AS IT WILL BE PHASED OUT, TOGETHER WITH THE EXISTING TEMPORARY PLANT, WHEN THE PERMANEN` TREATMENT WORKS IS COMPLETED.

+WHEN THEY HAVE OUTLIVED THEIR USE AT SHA TIN, THE EQUIPMENT IN THESE TWO TEMPORARY PLANTS WILL BE REMOVED AND PROBABLY PUT TO OTHER USE ELSEWHERE, SAID MR, WONG,

HE EXPLAINED THAT THE TREATMENT SYSTEM OF THE PERMANENT PLANT WOULD INVOLVE A SERIES OF COMPLEX PROCESSES WHICH COULD ROUGHLY BE DIVIDED INTO THREE STAGES.

+THE FIRST STAGE INVOLVES A PROCESS KNOWN AS SEDIMENTATION WHEREBY THE SCREENED SEWAGE IS PASSED THROUGH TANKS WHERE ALL THE GROSS SOLIDS ARE REMOVED, THUS REDUCING THE AMOUNT OF POLLUTANTS BY ROUGHLY 60 PER CENT.

+THE SECOND STAGE INVOLVES FURTHER REDUCING THE POLLUTANTS BY INTRODUCING AIR INTO THE SEWAGE THUS ENCOURAGING BIOLOGICAL PUR IF ICATION PROCESSES.

+ THE REMANING EFFLUENT IS THEN PASSED TO FINAL SETTLING TANKS WHERE THE REMAINING SOLIDS SETTLE OUT BEFORE THE CLEAR EFFLUENT IS DISCAHRGED INTO THE SEA.+

THE SLUDGE THAT REMAINS BEHIND, HE SAID, WOULD BE DIGESTED, DEWATERED AND COMPOSTED WITH GARBAGE FOR USE AS LANDFILL IN P.W.D. CONTROLLED TIPPING OPERATIONS.

THE SHA TIN NEW TOWN PERMANENT SEWAGE TREATMENT WORKS HAS BEEN DESIGNED BY WATSON (H.K.) CHARTERED CIVIL ENGINEERS, CONSULTING ENGINEERS TO THE GOVERNMENT, UNDER THE OVERALL SUPERVISION OF THE CONSULTANTS MANAGEMENT DIVISION OF THE P.W.D.'S CIVIL ENGINEERING OFFICE.

TRAFFIC ARRANGEMENT ON HONG KONG ISLAND

*******

THE SECTION OF CONSORT RISE BETWEEN 20 BISNEY ROAD AND 21 CONSORT RISE WILL BE RE-ROUTED ONE-WAY EASTBOUND FROM 10 A.M. TOMORROW (MONDAY).

APPROPRIATE SIGNS WILL BE PUT UP TO GUIDE MOTORISTS,

/4......