Advances in Sludge Dewatering: A Mining Solution for Council Operators

Sludge dewatering technology in the Australian and New Zealand water treatment industry is currently undergoing a technological revolution. This is driven by more stringent dry solids requirements for transportation and disposal, and reduced operations input. 

Industrial processes (such as mining) utilise advanced filter press technology for dewatering to ensure maximum water removal. 

Examples of advancements in filter press dewatering technology are units which include the following features and advantages: 

• Pressurised membrane squeeze cycles, hence higher dry solids of the resultant cake; 
• Shorter cycle times and faster turn over; 
• Cake release mechanisms which minimize the risk of cake hang-up; 
• Full automation and as such, reduced operator attendance; 
• Reduced chemical dosing requirements. 

This paper examines the advancements in sludge filter press technology applicable to the water treatment industry. It concentrates on a case study on a major New Zealand water treatment plant (WTP) and the reasons leading to the first installation of this particular filter press technology in the New Zealand water treatment industry.