Septic tank
A septic tank is an underground chamber made of concrete, fiberglass or plastic through which domestic wastewater (sewage) flows for basic treatment. Settling and anaerobic processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). Septic tank systems are a type of simple onsite sewage facility (OSSF). They can be used in areas that are not connected to a sewerage system, such as rural areas. The treated liquid effluent is commonly disposed in a septic drain field which provides further treatment. However, groundwater pollution may occur and can be a problem.
Bacton Gas Terminal
The Shell terminal, the most easterly of the three, receives gas and condensate from three offshore pipelines. These are a 55.7 km long 30-inch pipeline from the Leman 49/26AP offshore installation; a 106 km long 30-inch pipeline from the Sean PP installation; and a 73 km 24-inch pipeline from the Clipper PT installation. A mothballed 30-inch pipeline formally delivered gas from the Leman 49/26BT installation to Bacton. The terminal also receives gas from the long 34-inch SEAL Pipeline, which transports gas from the Shearwater and Elgin-Franklin gas fields in the Central North Sea. The SEAL Pipeline is the longest on the UK Continental Shelf. The Shell plant has a gas treatment capacity of 900 MMSCFD (million standard cubic feet per day) and a condensate stabilization capacity of 8,000 barrels per day (1,270 m/day). The gas hydrocarbon dewpoint is achieved by propane refrigeration. Truck loading facilities for condensate were originally provided. It employs 46 people and began operations in 1968. The BBL Pipeline terminal became operational in December 2006 and is located within the Shell terminal. The BBL terminal is operated, but not owned, by Shell.