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WASTEWATER TREATMENT DESIGN Design, installation, monitoring, contouring and modeling of groundwater wells. Wastewater treatment equipment design, soil science and agricultural engineering. Project Description: The James Thompson & Company, Inc. of Greenwood, Delaware produces a wastewater laden with sodium, chlorides, metals and organics from its dye manufacturing process. Wastewater treatment design includes flow by gravity through a series of trenches to a shaker screen sump. The shaker screen sump pump, controlled by mercury float switches, transfers the collected wastewater through parallel shaker screens . The wastewater drops through the screens, leaving residual threads from the dyed fabric behind. The fabric is collected in 55 gallon drums and transported to the local area sanitary landfill. Wastewater passing through the shaker screens is collected in a wet well and transmitted by a mercury float switch operated pump to a three million gallon holding lagoon. The lagoon is equipped with two 7-1/2 HP floating surface aerators for control of dissolved oxygen, odor and subsequent BOD reduction. 75,000 gpd is pumped by a 1,000 gpm centrifugal pump to one of five spray irrigation zones. Each spray zone is equipped with fixed set sprinkler assemblies located 90 feet on center. Sprinkler assemblies stand three feet above grade and are equipped with a ball valve and rotating full circle sprinkler head capable of 15 gpm at 50 psig. The system was designed to supply 50 psig at the furthest sprinkler head, approximately 3,000 ft. away. A mixture of fescue grass and naturally occurring vegetation is used to provide uptake for chlorides, organics and metals produced in the wastewater. Twelve monitoring wells were installed around the 48 acre spray zone perimeter and are monitored quarterly for groundwater elevation and chemical constituents. Groundwater contours are plotted and chemical constituents graphed for rise and fall in concentration. Addition of soil amendments to the fields is conducted based on annual soils analysis. In this manner, the soils and vegetation are kept in balance with the applied wastewater nutrients. The system has operated successfully since 1993 and is a model for the economic treatment of wastewaters from dye manufacturing processes.