Industries - Land and property

Land and property

Redevelopment and reclamation

Parnaby Cyclones provides a range of services and equipment to contractors involved in the redevelopment of land and property. This market has grown substantially as a result of government policies to reduce waste disposal to landfill and to build on brownfield sites.

Demolition and skip waste

We provide contract services for the sorting, separating, recovery and disposal of waste from demolition sites and from skips from contractors.

Much of the waste is in the form of stone, brick, concrete and plaster which we transform into graded recycled aggregates suitable for use in concrete, car parks, pipe laying etc.

We also separate wood, metal and plastic suitable for recycling.

Soil reclamation

We work with contractors to decontaminate brownfield sites prior to redevelopment. We use mobile units to wash and separate all the aggregates, sand and soil excavated on a site and make them suitable for reuse. At the end of the effluent treatment process any contaminates in the form of a dry filter cake which is then encapsulated in a cementatious mix suitable for burial.

Operation

This simplified flow diagram shows the washing, separating and dewatering processes involved in recovering material for recycling and reducing and making manageable the waste material for disposal. This system is designed for soil reclamation, but with minor adjustments it could be suitable for other recycling operations.

Raw material is fed over a vibrating deck which rejects all pieces larger than 100mm. An overhead magnet removes metal. The material is fed into a logwasher which breaks it into smaller particles which are passed over a dewatering screen. The larger particles of sand and aggregates are collected for recycling, the finer particles are conveyed to a classifying cyclone and then over a high frequency screen where fine sand and aggregates are collected for recycling.

The effluent is passed over a vibratory sieve and then to a thickener/clarifier cone. A flocculant is added which causes fine particles to bind together and settle rapidly. Water and oil overflows from the top of the clarifier into an oil-water separator. The sludge at the bottom of the cone is pumped to a conditioning tank. More flocculant is added to the sludge as it is pumped to a filter belt press where it is compressed. The filtered water flows back to the sump and is recycled. The dry filter cake, which may contain contaminated particles, is encased in cement for safe burial.