EVALUATING THE PERFORMANCE OF UNIVERSITI TEKNOLOGI PETRONAS (UTP) SEWAGE TREATMENT PLANT (STP) AND IMPACT OF CHEMICAL WASTE DISCHARGE ON TOTAL SUSPENDED SOLIDS REMOVAL IN CO-TREATING WITH UTP's WASTESTREAM

This project is about to evaluate the performance of Universiti Teknologi
Petronas Sewage Treatment Plant (UTP's STP) with the help of activated sludge
wastewater treatment pilot plant The sewage treatment plant (UTP's STP) consists of
inlet chamber, grit and grease chamber, distribution chamber, anoxic zone, aeration
tank, clarifier and chlorination tank; and the activated sludge wastewater treatment
pilot plant consist of feeder tank, aeration tank and a clarifier The main purpose of
this project is to evaluate the performance of the secondary treatment process from
UTP's STP consistingofan anoxic zone, aeration tank and a clarifierand evaluate the
impact of chemical waste solution prior to treatment into the STP. A pilot plant with
feeder tank, aeration tank and clarifier was used to stimulate the UTP's STP treatment
process. The parameters that have been studied for this project is mixed liquor
suspended solids (MLSS) or activated sludge, Total Suspended Solids (TSS) and
Sludge VolumeIndex (SVT) or sludge settleability. Wastewater from UTP's STP was
fed into the activated sludge wastewater treatment pilot plant once in a week. The
flowrate and retention time measured from exact operation of UTP's STP was scaled
down (1:6) in the pilot plant to stimulatethe process of UTP's STP into the activated
sludge wastewater treatment pilot plant. The laboratory experiment was done in two
different phases. For Sewage Treatment Plant, in the first phase, tests wereconducted
before the oxidation pond wastewater was diverted to Sewage Treatment Plant and in
the second phase, tests were conducted after the oxidation pond wastewater was
diverted to Sewage Treatment Plant Result obtained showed, the effluent from STP
for both phases was met the Environmental Quality Act (EQA), 1974 standard.
Meanwhile, for pilot plant, in the first phase,tests were conductedunder the condition
of no sludge recycle in activatedsludge and in the secondphase, tests were conducted
under the condition of allowing sludge recycle in activated sludge addition with
chemical waste solution discharge from Chemical Block 3 and 4. Result obtained
showed, percentage of TSSremoval in the first phasewas91%and dropped to 36%in
the second phase. These suggested that additionalofchemicalwaste gave an effect on
the treatment plant operation. SVT results obtained showed, the settling quality of the
pilot plant aerated mixed liquor was satisfied.