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Remediation - Overall savings - $22 million |
Site Remediation (Northeastern United States)
A landfill site was used by a pigment manufacturer to dispose of heavy metal wastes (Ba, Cd, Cu, Pb, Mn, Ni, Zn) until 1953. This resulted in contamination of the groundwater near the sites.
The USEPA Record Of Decision (1993) recommended excavation, deep soil mixing and stabilization in a new controlled site. - Cost $34 million.
An alternate approach, based upon the precipitation and solubility characteristics of heavy metals under subsurface conditions, was devised using OLI Software for large range of T, P, pH and concentration.
The new proposal, based upon containment and chemical precipitation for stabilization, was accepted by USEPA in 1995 - Cost $12 million.
Overall savings - $22 million
Urban Waste Water Treatment ( Hong Kong )
A flowsheet specification design was evaluated using ESP’s DynaChem during the pre-construction phase of an urban waste water treatment plant.
Within 5 weeks, over one dozen flowsheet and operational changes were made based upon simulation results.
These changes resulted in the following improvements: water re-use, start up and shut down, operability, treatability performance and energy requirements.
Overall savings in 5 weeks - $800,000
Industrial Effluent Treatment ( Tyneside, UK )
Three operating plants on one site were discharging more than twenty different streams into a river, resulting in an effluent with very large changes in flowrate, composition and pH outside EPA requirements.
Process design and optimization of a pH Control Plant was achieved using ESP (including DynaChem).
Simulation results were used to develop and justify a complex multistream and multicomponent treatment plant, which satisfied EPA requirements.
Overall capital cost savings in six weeks - $750,000
Pulp and Paper Waste Minimization (Southeastern United States)
An assessment and specification of a novel gas treatment unit (TRS Scrubber), for a complex chemical system, on a pulp and paper plant, was done using ESP.
The approach involved scrubbing of a concentrated sulfur and mercaptan gas stream using an existing waste stream, in order to lower total reduced sulfur (TRS) to required levels.
Simulation negated the need for time consuming and expensive laboratory and pilot plant testing.
Overall savings - 3 Months
