SYNOPSIS

Sewage sludge is a byproduct of domestic wastewater treatment industry and its properties depends on the quality of sewage and type of treatment processes. The high humidity and special composition of sludge make it rather difficult for dehyration and utilization. With the development of enviromental pollution treatment technology, different methods are adopted to dispose sludge, i.e. recycling in agriculture, landfilling, dumping into sea and incineration. Nevertheless, these processes have the problems of high cost, large energe consumption, complicated operation and mantenance, secondary pollution. Hence, for environment sustainability, another leap in transformation of sludge disposal is required like minimizing the excess sludge amount to a remarkable level to reduce all the further side effects of excess sludge treatment.

SPRAS process technology (based on High concentration activated sludge method) is a new process improved from traditional anoxic-aerobic sewage treatment process. Typical characteristic of this technology is that activited sludge in aeration tank is in a special balance of growth and decline under the condition of high concentration (7000-9000mg/L) which could decrease 60~70% of excess sludge.

Other benefits of the SPRAS process includes reducing the footprint of traditional STP because of higher treatment efficiency to save our precious land reserve in urban area.


BIODATA OF SPEAKER

Ms. Stephanie Sim earned her Bachelor’s degree in Civil Engineering from Kolej Universiti Teknologi Tun Hussein Onn in 2002. She pursued her post graduate study in Engineering (Civil-Environmental Management) from Universiti Teknologi Malaysia in 2005. She has over 12 years’ experience in the sewerage sector established from engagement with Indah Water Konsortium Sdn. Bhd. and Suruhanjaya Perkhidmatan Air Negara. Her involvement was at large in the development of standards/policies and guidelines for the industry, quality management of sewerage assets, certifying sewerage works and regulating sewerage services industry.