|
|
Biosolids
Sewage Sludge Treatment
 Treatment of sewage sludge has become a significant issue for water companies since dumping at sea was made illegal in 1997. One solution for sewage sludge is to sanitise it and stabilise it into a 'cake' which then can be used as a fertiliser on agricultural land.
The challenge for the water industry is to produce a process that is robust, cheap and creates minimum odour. This process usually involves extracting the liquid element of the sludge and then treating the solid residue with lime, which heats up the cake and sterilises it. The lime content also adds a nutrient value that enhances the cake as an agricultural fertiliser. Once treated, the cake has a significantly reduced odour and is sterilised to a degree that it is safe to spread directly onto land.
Many different systems have been trialed and operated within the UK using different mechanisms, including belt presses and centrifuges. Because it is critical to have a constantly operational plant, most UK companies run systems that have significant operational redundancy and spare parts on-line that in effect triple the size of the plant needed to be built.
Agrivert has designed a unique process using centrifuge technology to dewater and lime treat sewage sludge to produce a stable cake. The design has very high output levels compared to the capital investment needed and has very low operating costs. Critical spares are kept on site to ensure smooth and uninterrupted operation of the plant.
 |
|
 |
Case Study: Northumbrian Water
A sewage sludge treatment plant built and run for Northumbrian Water by expert waste treatment company Agrivert has been hailed for its design and efficiency....coming soon
|
|
 |
| |
