Gary Wealthall (Ontario) and Doug Larson (Massachusetts) will teach upcoming sessions of the Princeton Groundwater Hydrology Course in Miami, Florida, October 24 – 28, 2016.
Geosyntec’s Gary Wealthall, Ph.D. (Ontario), and Derek Tomlinson, PE, P.Eng., BCEE (Pennsylvania), contributed to the creation of a series of webinars based on the LNAPL illustrated handbook. The LNAPL illustrated handbook presents best-practice guidance for the assessment and remediation of light non-aqueous phase liquids (LNAPLs) in the subsurface.
Geosyntec employees will be presenting at the Ekos Brazil Seminar, entitled "International Seminar for Remediation and Development of Contaminated Sites," at Senac Santo Amaro on September 28-29, 2016.
The Budds Farm Wastewater Treatment Works operated by Southern Water Services Ltd. treats waste water from the Portsmouth and Havant catchments. Prior to 2006, the Wastewater Treatment Works at Budds Farm had eight final clarifiers of 35m internal diameter. In order to meet the requirement of projected AMP4 flows, the existing settlement tanks were modified and two new 35m diameter clarifiers were built to operate alongside the existing eight tanks.
There are a large number of legacy biological filtration plants in the UK, dating back to the 1920s and 1930s. In such plants, the influent wastewater is screened and settled in primary tanks prior to filtration in biological filter beds. Effluent from these beds passes to humus tanks, where residual solids are allowed to settle out. Final effluent may then be polished through sand filters prior to discharge. Humus tanks are similar in design to other types of primary and secondary settlement tanks. They can be of radial flow, upward flow, or horizontal flow types. The sludge must be removed from the tanks regularly and continuously in a large works.
During periods of heavy rainfall, Eastney Sewage Pumping Station diverts flow to the Fort Cumberland Storm Tank. During the first flush, the solids content of the flow is higher than normal, which overloads 6mm band screens located upstream of the storm tank. In order to help separate a greater quantity of solids from the flow and enable the screens to work as intended, it was proposed that the storm tank receives the flow and provides a residence time for solids to settle.
Civil engineering structures are used to distribute the flow and solid loads to multiple settling tanks or activated sludge plant (ASP) lanes at a sewage treatment works (STW). Achieving a good solids distribution requires adequate mixing to homogenise the solids, but this can be detrimental to achieving a good flow distribution, which normally requires quiescent conditions.
In 1993, as a result of corporate safety, health and environmental policies, the client initiated a review to assess potential hazards to human health and the environment resulting from historical industrial waste disposal activities.
Like other industrialized nations, groundwater supplies beneath many industrial sites in Sweden are contaminated with chlorinated solvents. Compared to countries in North America and other parts of Europe, however, chlorinated solvent impacts in Sweden have not attracted much attention until recently. In 2005, the Swedish Environmental Protection Agency (Naturvardsverket) recognized the need for national guidance on chlorinated solvent remediation. To meet this need, they commissioned a project for the development of a Technical Manual for Screening and Selecting Technologies for Remediation of Chlorinated Solvents in Soil and Groundwater and selected an international team of experts, consisting of SWECO VIAK (Sweden), Geosyntec Consultants (USA and Canada), and COWI A/S (Denmark) to write the Manual.
Groundwater beneath a former manufacturing facility in a small Danish town is contaminated with part-per-million levels of trichloroethene (TCE) and cis-1,2-dichloroethene (cDCE). The TCE and cDCE contamination occurs primarily in a low-permeability clay layer that is not amenable to an active forced-gradient bioremediation design.
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