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TheTankMSD Economy Type II Marine Sanitation Device is a biological aerobic (bacteria and air) sewage treatment system. Liquid and solid wastes are removed from the water by bacteria naturally contained in sewage.
TheTankMSD consists of three treatment stages; aeration, clarification, and disinfection. In the aeration chamber (stage 1), the bacteria grow and multiply using the sewage as their food supply. This action reduces the quantity and size of the solid matter. In the clarification chamber (stage 2), the bacterial floc is separated from the treated solid matter. The treated water is clear and free from solids, however, the liquid must be disinfected prior to discharge overboard to kill any disease-causing bacteria. Disinfection is accomplished in the clarification chamber (stage 3).
Flow through these three stages is caused by direct displacement. When new sewage flows into the aeration chamber, an equal volume flows through the clarification chamber. This volume, in turn, displaces an equal volume from the clarification chamber into the disinfection chamber, and overboard. No internal sewage pumps are necessary.
For Vessel General Permit ( VGP ) compliance where needed for gray water treatment, for ease of retrofitting a system on boats with exisitng MSDs, use another dedicated compact MSD. We can furnish you with a system including a bag filter setup to handle the TSS total suspended solids and keep you under permit limits and then run that gray water through the MSD itself for the gray water disinfection by chlorine prior to discharge.
NOTE: Running your gray water through an existing MSD will most likely hugely overload the MSD hydraulically since it was not originally sized for the large volumes of gray water — relative to the black water/sewage loading it was designed for. An overloaded MSD will not adequately treat the sanitary waste — taking you out of compliance on the MSD which is USCG approved for a much smaller hydraulic loading.
Sewage is aerated as soon as it enters the treatment system, and mixes with the aeration liquid already in the aeration chamber. Plastic non-clog diffusers inject air near the bottom of the aeration chamber so that the sewage remains in a state of aerobic decomposition. This aerated liquid contains the bacterial sludge that reacts with the sewage to start the reduction process. The movement created by the injected air helps mix the sewage with the bacterial sludge and prevents sludge and sewage solids from settling to the bottom. The air discharged from the surface of the liquid in the aeration chamber is vented to the atmosphere through a vent line connection.
The liquid displaced from the aeration chamber flows into the clarification chamber for further treatment. Some of the suspended material will settle out into the chamber below, where it will be returned to the aeration chamber. The remaining sludge and waste material is removed as the liquid flows upwards through the biological filter media. Bacteria grow on the surface of the media and produce a sticky, slimy film that traps small particles of waste. The trapped waste is then consumed by the bacteria on the surface of the filter media. By the time the liquid reaches the top of the biological filter, it has passed by several layers of bacteria, ensuring that the sludge and waste removal process is completed. Clear water accumulates here until it is displaced into the discharge line, and the disinfection chamber.
The water flowing out the discharge line of the clarification chamber is collected in the disinfection chamber (chlorine contact chamber), where disinfecting chlorine tablets are located. In this chamber, the water mixes with the disinfectant for a residence time sufficient to complete the disinfection stage of the treatment process.
The clear disinfected waste water is then discharged overboard, or sent to a holding tank (for use in No Discharge Zones) for later discharge. When directly discharged overboard, the disinfected waste water flows from the disinfection chamber through a gravity discharge connection to overboard. If desired, the treated liquid can be retained in a holding tank, for later discharge, when the system is used as a Type III unit.
Standard Marine Sanitation Device offers these benefits:
These systems eat caca.
THE PROCESS OF TREATING WASTE
The Tank MSD Type II Marine Sanitation Device is a biological Aerobic (bacteria and air) Sewage Treatment System. more info
Sewage is aerated as soon as it enters the treatment system and mixes with the aerated liquid already in the aeration chamber. more info
The liquid displaced from the aeration chamber flows into the clarification chamber for further treatment.
The water flowing out of the crossover line is directed through a chlorine tablet feeder…. more info
The disinfected water is then discharged overboard through a gravity overboard discharge connection.
The Law!!! — Excerpt from Marine Safety Manual, Volume II, Chapter 18
Marine Sanitation Devices (MSDs)
1. Introduction. Section 312 of the Federal Water Pollution Control Act (FWPCA), as amended (33 U.S.C. 1322), required MSDs to prevent the discharge of untreated or inadequately treated sewage into U.S. waters. It requires a certified operable marine sanitation device (MSD) on every vessel with an installed toilet. Installed toilets that are not equipped with an MSD, and that discharge raw sewage directly over the side, are illegal…. more info
U.S. Department of Transportation
Federal Marine Sanitation Device Regulations
Marine Toilets — Introduction
The Environmental Protection Agency (EPA) issued regulations on 29 January 1976 which revised the Federal standards of performance for marine sanitation devices (MSD's). The regulations apply to all vessels on which toilet facilities have been installed, but do not require the installation of toilet facilities on a vessel which does not already have an installed toilet…. more info
Failure to comply with this Federal Regulation
BilgeVAP—Zero Liquid Discharge
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