Finex Ltd are based in Hamilton and are New Zealand’s largest anodizing plant. The company utilises the Type II Anodizing procedure for a variety of products.
AJM supplied and commissioned a recessed chamber filter press to reduce off site disposal costs of sludge. The installation has resulted in great economic benefit to the company.
Finex Ltd operate a trade waste treatment plant for their factory effluent. The wastewater is treated in a system that comprises pH correction, flocculation and separation in a clarification process.
Settled sludge is pumped to underground storage tanks. From here, the sludge, with a concentration of 5% w/w solids, is pumped to an AMSTON® Recessed Chamber Filter Press for dewatering.
An air operated diaphragm pumped is used to transfer sludge to the filter press and bring the press up to 6 bar pressure.
The filter press consists of 800 x 800mm recessed chamber plates with 32mm recess. At the end of the filtration cycle, a cake is formed which contains greater than 40% w/w solids. Filtrate gravitates to the nearby sewer discharge.
Since the initial start up of the plant, the system has operated trouble free with excellent results.
The press is fitted with the AIRTRACK Plate Shifter, resulting in plate pack open/close times of less than 5 minutes for one operator.
The installation has resulted in a significant cost reduction for sludge disposal. The volume reduction was greater than 80%.
| Item | Detail |
|---|---|
| Influent Concentration | 5% |
| Cake Solids | > 40% |
| Polymer Dosage | None |
| Cycle Time | 2 hrs |
| Filtration Pressure | 6 bar |
