Industrial Waste Systems  Many commercial and industrial operations produce wastewater that cannot be disposed of directly into the sewage system. This wastewater which is a by-product or a result of their operations contains grease, sand, solids, flammable wastes and acidic or very alkaline materials which must be intercepted before being discharged. Increased maintenance costs and collection system deterioration can result if small amounts from many sources are sent into the sewage collection system.  To protect communities from increased operational costs caused by industrial operations disposing into the system, local ordinances and local codes have been adopted. Interceptor requirements will vary from area to area.  All system sizes are manufactured to ordered specifications.  Please contact Mid-State Concrete Products, Inc. regarding the following: Grease Interceptors Commercial Septic tanks (Battery Systems) Commercial Disposal Systems Holding Tanks Riser and filter accessories Grease Interceptor  Institutions, fast food establishments, restaurants and camps, all produce grease in quantities that require interceptors. Due to the formation of grease, large volume interceptors are required to provide cooling for separation and coagulation.  An on-site disposal system can fail as a result of grease-clogged soil. Grease entering a community sewage collection system can cause frequent line plugging.  Following are some guidelines to follow in installing a grease interceptor: A check of local ordinances and codes should be made and followed. Grease interceptors should be located to allow easy pump truck access to allow proper maintenance. The interceptor should be located as close to the grease source as possible. Local codes will stipulate proper setbacks from structures, property lines, etc. Influent should enter below the normal water level to allow for quiescence. Manhole risers to finished grade should be provided to allow for proper maintenance. The manhole cover(s) should be gas-tight and able to withstand expected loading. Separate disposal areas should be used for grease interceptor and septic tank effluents for on-site disposal systems. Commercial Septic Tank (Battery Systems)  Commercial septic tanks are most commonly used for subdivisions, institutions such as schools, hospitals, parks, camping areas and recreational resorts.  The septic tank should be located where it can receive gravity flow from the project. When the septic collection system covers a large area it is to your advantage to break the system down into two or more separate systems. Remember, if the septic tank is deep the collection lines and disposal system will be the same depth. Bringing the system to grade with concrete risers is an important part to the life of the commercial septic system. These risers should be located over at least the inlet and outlet. This will insure that proper pumping maintenance is possible. Commercial Disposal System  A dosing tank consists of a holding tank with an automatic siphon or siphons which discharge effluent into the disposal field at a predetermined volume. This large intermittent dose allows drying of the field between doses. This action is taken to extend the life of the leach field.  In designing a commercial disposal system check local ordinances for requirements of disposal system dosing. Holding Tank  A holding tank is not a septic system. Holding tanks are used only when an on-site wastewater disposal system cannot be installed on the property due to shallow bedrock, shallow ground water, etc. A holding tank stores all household wastes. When the tank is filled, it must be pumped, and the wastes taken to an approved disposal field or municipal treatment plant. Clarifiers, Sand and Grease Interceptors  Local codes and ordinances require installation of clarifiers, sand and grease interceptors to prevent the entrance of heavy industrial solids and oils to the collection system.  Clarifiers are usually installed at machine shops and fabricators, while sand and grease interceptors are normally installed at mechanic or repair shops and car washes.  The interceptor is so designed that quiescence is achieved allowing sedimentation and flotation. An effluent sampling box is typically installed on the outlet end of these interceptors, allowing for easy inspection and sampling needed to confirm performance. Sand Traps  The sand trap is a two-compartment interceptor designed to trap oil and grit from wash-down water. It is usually installed in service stations where the volume of wastewater does not require the installation of a grease or sand interceptor.  The sand trap is usually installed in a central area inside the service bays of the station. The station's bay floor is sloped for direct drainage of wash down water into the inlet compartment of the sand trap through a grated cover. The fitting placement allows for maximum grit collection. The removal of this accumulated grit is done simply by removing covers that expose the entire interior of the trap.