Treatment Plants for Tankered Industrial Concentrates

High Strength Biological Effluents (South East Asia)

Treatment expertise was provided to a South East Asian design team for the tender, design and ultimately the construction and operation of a biological effluent treatment plant for tankered wastes from the grease traps of food processing establishments.

This plant also included some novel integration of established but previously unconnected process and equipment concepts. The effluent was characterised by very high BOD and COD loadings in conjunction with fats, cooking oils and miscellaneous food residues. This plant is operating successfully.

Deep Well Injection Pretreatment Plant USA

A Client with an existing open lagoon system where hazardous aqueous wastes were mixed, blended and diluted, had to convert this arrangement into a totally enclosed reactor tank system. This system was upstream of a deep well injection facility. A further problem was the blinding of the relatively low permeability sandstone strata into which the blended wastes were injected at the base of the deep wells.

Dr Paxton developed a process for treating the wastes to prevent “down hole” problems whilst minimising the production of treatment residues and successfully performed small scale proving trials. From these trials, the process was detailed, designed and installed within the required four months imposed by the regulatory body. The resultant plant has operated successfully for over fifteen years.

Combined bulk liquid and de-drumming facility (Surrey) UK

A company in the South East of England wanted to establish a treatment and transfer facility for bulk and drummed liquid chemical wastes.

We designed a plant incorporating chemical and biological treatment capability that handled a variety of wastes. As the site was located in a densely populated area, strong emphasis was placed upon odour control. Safety and environmental protection measures were also particularly important.

A negative pressure ventilation system was developed for all the plant areas, discharging through a carefully arranged combination of activated carbon filters, and wet chemical scrubbers. Further security was provided by careful selection of the chemical and physical processing methodologies and techniques by attention to detail in the layout of the plant, in the piping and cabling routes and in detailed operating concepts. These were all designed to minimise both the risks and the consequences of spillages, operator error or equipment failure as well as ensuring that quick and effective action could be taken in the event of any such incidents or accidents.

Liquid Waste Treatment Facility (Argentina)

A fully integrated waste processing facility for aqueous and organic wastes, including wastes from automotive, petroleum, petrochemical, fine chemicals, animal processing and food production processes. The facility incorporated the following:

• Chemical and biological treatment of aqueous waste
• Solvent recovery
• Incineration of non-recoverable wastes and residues
• Odour and fume control
• Surface water management
• Ground water protection
• Drum management and emptying

We were the co-ordinating and technical lead consultants for the project. This involved defining process designs for the full treatment of all the aqueous wastes. These aqueous wastes included both those which were produced on site and those which were transported to the site. Our role was to ensure the overall integration of the designs with particular reference to functionality, operability and environmental protection.

Further designs were prepared to enable the Client to use solidification and stabilisation techniques for the processing of the solid residues from the site prior to landfill offsite, so as to simplify the long-term requirement for off-site disposal.

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