The alum sludge which is also known as water treatment residual or waterworks sludge contains high amount of aluminium due to usage of Al compound as the coagulant. Annually about 80,000 tons of the alum sludge waste is produced from water treatment…

The product is a simple and rapid organophosphorus (OP) compound detection system as shown in Figure 1.0. The detection is based on colorimetric method which incorporated with image processing technique. Obvious color change can be observed after…