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Marine Sanitation Device Introduction A Marine Sanitation Device, or commonly known as an “MSD” is a specific piece of machinery or system of machinery that is dedicated to treat, process, and/or store raw, untreated sewage that can accumulate onboard water vessels. It does not refer to portable devices such as portable toilets.
Variations of MSD’s available Currently, there are three kinds of Marine Sanitation Devices that are certified by the coast guard for use. Type 1: This kind of Marine Sanitation Device has a flow through discharge setup. The sewage is broken down and processed through the use of chlorination and/or maceration. The bacteria count per one hundred millimeters of water must be less than one thousand. In a Type 1 MSD, there must be no evident floating solids. Type 1 MSD’s also rely heavily on chlorination and maceration to break down the bacteria present. Type 2: Just like type 1, this Marine Sanitation Device is also a flow through discharge setup. However, the sewage is broken up through the use of aerobic bacteria or some other biological digestion process. The bacteria count found in one hundred milliliters of water produced from this system cannot be greater than two hundred. Type 2 MSD’s are usually reliant upon biological or aerobic digestion of bacteria present. Type 3: This kind of Marine Sanitation Device is very different compared to type 1 and type 2. This type is usually large storage tank that holds treated or untreated sewage that is held and deposited when the vessel returns to port. There, it is deposited onshore and treated accordingly. However, type 3 Marine Sanitation Device’s can also be incinerators or some form of recirculation plant. Ultimately, this kind of Marine Sanitation Device does not discharge its contents into the surrounding water. Instead, contents of a Type 3 Marine Sanitation Device are discharged into a holding tank or treated with advanced technologies including but not limited to incineration, recirculation, and composting. International Laws and Regulations Under IMO, or International Maritime Organization, MARPOL 73/78, also known as the International Convention for the Prevention of Pollution From Ships ("Marpol" is short for marine pollution and 73/78 short for the years 1973 and 1978.) There are a total of six annexes that compose Marpol. Annex IV deals with the pollution of sewage by ships. In Annex IV, there are a total of 11 regulations regarding the laws and regulations surrounding sewage discharge and treatment plants onboard. It wasn’t until the United States implemented Act to Prevent Pollution from Ships. 33 CFR part 159 According to the United States Coast Guard, no vessel with a toilet on board may be operated unless there is a Coast Guard approved Marine Sanitation Device (MSD) aboard the vessel and fully functioning. These following regulations must be in compliance with 33 CFR part 159. The purpose of 33 CFR part 159 is to comply with the Environmental Protection Agency under section 312 of the Federal Water Pollution Control Act which prohibits the discharge of untreated sewage into any body of waters of the United States. CFR 159 also has restrictions on vessels manufactures and vessels operators. Vessel manufacturers under CFR 159 may not sell, any vessel equipped with toilet facilities unless there is a) an operable Type II or Type III Marine Sanitation Device or b) an operable Type 1 device on a vessel that is less than 65 feet in length. Requirements for the vessel operator state that no person may operate the vessel unless a) an operable Type II or Type III Marine Sanitation Device or b) an operable Type 1 device on a vessel that is less than 65 feet in length and that if in a body of water where the discharge of untreated or treated sewage is prohibited by the Environmental Protection agency the vessel operator must secure the device. History After the Environmental Protection Agency issued certain regulation on January 29th, 1976, regulations that are established today were upheld. Along with that, the Federal Water Pollution Control Act or also known as Clean Water Act, which was established in1972, set the basis for regulations with regards to the Environmental Protection agency standards. Under section 312 of the Clean Water Act, the discharge of sewage from vessels must be controlled through the equipment which treats the sewage also known as Marine Sanitation Devices. Because of these regulations, certain states and the great lakes have established areas that are close to shore as no discharge zones. The reason in establishing regulations on marine sanitation devices is to prevent the spread of disease, keep the oxygen content in the sea at a healthy level, and to keep our ocean healthy in regards to appearance. Treatment The purpose of the Marine Sanitation Device is to treat the incoming blackwater and graywater that accumulates onboard a floating vessel. Graywater is water that drains directly from a shower, sink, or machinery located in the scullery. Normally, graywater is discharged directly overboard since it is technically considered sewage and not damaging to the environment. However, in most ports around the world, discharge of fluids is strictly prohibited. To compensate for this situation, graywater piping is rerouted to the MSD. Blackwater is another word for sewage or human body wastes and wastes from toilets. According to the international maritime organization or the IMO, untreated sewage cannot be discharged overboard unless it is 12 nautical miles from the nearest land. Due to regulations issued by the IMO and the Maritime Administration or MARAD, every ship must have an approved marine sanitation device aboard their ship. Blackwater is therefore treated through a process that utilizes chlorination and/or biological treatment before being discharged overboard.
Biological treatment In type 2 Marine Sanitation Device’s, sewage is broken down through the use of a natural biological component. Usually, this biological component is aerobic bacteria that occur in the media tank. Even though the sewage can have some aerobic bacteria naturally, a majority of the bacteria population is grown on mediums located within the media tank. Since aerobic bacteria require oxygen to live, some form of air pump is necessary to provide sufficient oxygen for the bacteria. This air pump can be a fan or roots blower connected to the tank. By providing sufficient air, most of the smell caused by sewage and anaerobic bacteria is eliminated. Chlorination and Maceration In type 1 Marine Sanitation Device’s, sewage is broken down usually through the use of chlorination and/ or maceration. The chlorination process is usually done within a large tank sometimes referred to as the contact chamber. By adding chlorine to the sewage, the effluent is sanitized and it is discharged from the MSD. The maceration process aboard ships is usually done using some form of machinery to crush and pulverize the incoming sewage. However, since a large portion of bacteria is still present in the macerated sewage, the sewage is considered untreated still. Due to this circumstance, maceration machinery is usually paired with some form of chlorination process in the same system. Very few places around the world allow the discharge of untreated sewage from a maceration process. Advanced Water Treatments Sometimes, certain water vessels are equipped with advanced water treatment plants instead of traditional Marine Sanitation Device’s. Advance Water Treatment plants can also be referred to as Advanced Wastewater Purification (AWP) systems. They are most commonly found on ships that sail in Alaskan waters and sometimes work in parallel with an onboard Marine Sanitation Device. Royal Caribbean International, for example, have installed AWP systems on their ships which treat wastewater using advanced technology. Royal Caribbean AWP systems include three types of water purification systems, Scanship, Hydroxyl/Headworks and Navalis. Scanship and Hydroxyl use biological treatment while the Navalis system primarily uses advanced oxidation and filtration methods. Scanship and Hydroxyl systems use bacterial to consume the waste while also utilizing a chemical in order to break down and remove solids. Scanship and Hydroxyl systems are very similar to water treatment plants based on shore. This involves a simple five stage process. The first stage involves a prefilter where screens removes heavy and noticeable solids from the waste influent. Then the wastewater is passed through a biological reactor which uses beneficial bacteria to further break down any solids. Next the influent is pumped through a flotation unit which removes floatable waste. Afterwards, the clean water is passed through polishing filters which make the water even cleaner. The last and final stage involves an ultraviolet light reactor which disinfects the water. The final product may then be dried, incinerated, stored, or discharged at sea with respect to international regulations.
The Navalis AWP system utilizes a seven stage process in order to treat wastewater. The first stage involves wastewater entering the shaker screens which removes any noticeable solids. Then the wastewater is passed through an AET Roughing Reactor which help with chemical equalization and load. Then the influent is treated by a three stage particle removal process which involve chemical flocculation, Hydraulic Separation, Tubular Filtration, and Ultra Filtration membranes. The waste influent is then passed through Oxidation Reactors which serve to oxidize pollutants and aid the production of carbon dioxide gas and water. The seventh and final stage consists of a powerful Ultraviolet Reactor in which the ozonated water is broken down into oxygen compounds that provide further treatment of the water. The leftover solids are then oxidized which provide safe bio-disposal or land based discharge if needed.
Manufacturers In today’s world, there are many companies that offer reasonable deals for their respected machinery that they are trying to sell. Since a marine sanitation device is not an everyday device that occurs on land, it may be difficult in trying to select the right marine sanitation device. A popular distributor is Sciencofast which is known to offer a variety of types of marine sanitation devices. Another popular distributor is Ahead Sanitation Systems. This company has been known to sell whole Marine Sanitation Devices or separate components or pieces.
Bibliography 1. Marine Sanitation Device. (n.d.). Retrieved March 23, 2015, from http://www.uscg.mil/hq/cg5/cg5213/msd.asp 2. Federal Marine Sanitation Device Regulations. (n.d.). Retrieved March 23, 2015, from http://www.dbw.ca.gov/pubs/FedMSD/index.htm 3. Dasch, E. (2003). Water: Science and issues. New York: Macmillan Reference USA. 4. 33 CFR Part 159 - MARINE SANITATION DEVICES. (2008, June 19). Retrieved March 23, 2015. https://www.law.cornell.edu/cfr/text/33/part-159 5. McLemore, A. (2011). The engineering cruise notebook: A study guide for the engineering students of the Training Ship Golden Bear. Vallejo, CA. 6. Advanced Wastewater Purification Systems. (2012, July 12). Retrieved April 6, 2015, from http://www.royalcaribbean.com/content/en_US/pdf/RCI_wastewater_pur.pdf 7. Annex IV of MARPOL 73/78 Regulations for the Prevention of Pollution by Sewage from Ships. (n.d.). Retrieved April 8, 2015, from http://www.mpa.gov.sg/sites/circulars_and_notices/pdfs/shipping_circulars/mc03-18a.pdf 8. Leading manufacturer of water management solutions. (n.d.). Retrieved April 7, 2015, from http://www.sciencofast.com/ 9. AHEAD Sanitation Systems. (n.d.). Retrieved April 7, 2015, from http://www.aheadtank.com/
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