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Industrial Water Production Process

Introduction

Jurong Industrial Water Works (JIWW) is located at 41 Jalan Ahmad Ibrahim Singapore 609874. It was set up to reclaim wastewater effluent of the Ulu Pandan Water Reclamation Plant (UPWRP). The purpose of wastewater effluent reclamation is to provide alternative source of water for the industries in Jurong and Tuas Industrial Estate.

The Works has an original capacity of 45,000 m3 per day when it was first commissioned in 1966. The capacity was increased to the current capacity of 125,000m3 per day over the years to cater for industries set up on Jurong Island and Tuas South.

With effect from April 2007, we have stopped supplying industrial water to the industries in Jurong/Tuas Industrial Estate as NEWater has replaced industrial water as an alternative source of water in this estate. Currently, industrial water is only supplied to the industries on Jurong Island.

Treatment Processes

The wastewater effluent from UPWRP goes through a series of treatment processes before it reaches the quality required of industrial water. The various treatment processes carried out in the Works are:-

Screening

The raw water enters the Works from UPWRP through the intake chamber into the bandscreen chamber where the larger suspended solids are removed by the bandscreen equipment. The bandscreen removes large suspended solids and debris of sizes greater than 4mm.

 

 

 

Pre-Chlorination & pH Correction

The water then flows into the raw water pump sump where it is dosed with sodium hypochlorite solution. This process, which is called pre-chlorination, helps to suppress algae and bacterial growth on the surfaces of downstream units thereby reducing the amount of maintenance work required to keep these units clean. Caustic soda is also dosed when necessary to maintain the desired pH level. Acidic raw water is harmful to the downstream units as it will cause corrosion problem.

Chemical Clarification

After pre-chlorination and pH correction, the raw water is pumped to the clarifiers via the raw water pumps. At the clarifiers, the raw water is dosed with chemicals called aluminium sulphate (Alum) to bring about the coagulation, flocculation and sedimentation of the suspended solids in the raw water. The primary purpose of chemical clarification is for the removal of suspended solids and reduction of phosphates. The coagulated and flocculated suspended solids that settle onto the clarifier plates are then desludged into the sewer.

Sand Filtration

The clarified water from the clarifier flows by gravity into the sand filters where the remaining fine suspended solids are removed. Filter beds are regenerated regularly by means of backwashing using industrial water. The suspended solids that are trapped on the sand filters are then desludged into the sewer.

 

 

Aeration

The filtered water is then sent by gravity to the cascade aerator to increase dissolved oxygen in the water.

Post-chlorination

This is the final stage of the treatment process. The filtered water is channelled to the treated water tank where sodium hypochlorite is dosed to disinfect the treated water.

 

Industrial Water Reticulation System

After the post-chlorination process, the treated water is ready to be supplied to the consumers. The treated water is pumped to the 3 industrial water reservoirs (total capacity: 35,000 m3) situated on Jurong Island via the high-lift pumps and along the underground pumping mains.

Last updated on 14 Oct 2010