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Flowserve SIHI Pumps
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Catalog excerpts
Application Guide Sludge Mixers for Anaerobic Digestion
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Sludge Mixers for Anaerobic Digestion Since the 1950s, there has been a constant increase in water consumption and the amount of wastewater. Municipalities, industries and government are forced to treat sewage more and more intensively. During the process of treating wastewater a great amount of sludge is produced along the process way. This sludge is full of toxic substance and full of potential pathogens and have to be treated in a separate way so that it will be transformed from a aggressive into a harmless by-product of wastewater treatment plants. Additionally the ratio of organic...
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The Wastewater Treatment Plant The sludge of a wastewater treatment plant (WWTP) will be produced in two areas of the process - mechanical treatment and biological treatment of wastewater. The mechanical treatment In the mechanical treatment the so called primary sludge will be separated of the wastewater by using screens and sedimentation tanks. It contents of mostly fat and large amounts of biodegradable organic material. Up to 90% of all waste is separated from the wastewater within this process step. Sewer Grit chamber Primary clarifier Screen To the biological wastewater treatment...
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The Sludge Process The sludge process which takes place in the anaerobic digester is also called sludge stabilisation and requires a uniform temperature, pH and material profile within the total volume of the digester. It is a biological process, which means living bacteria groups are needed for this step and any bigger variations of the process conditions would kill the bacteria groups. The process will stop at once! Biogas The process of anaerobic digestion is separated into four steps: Hydrolysis: In this step polymers like hydrocarbons, fat and proteins are braken down in smaller...
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The Draft Tube Sludge Mixer - MFS The draft tube sludge mixer is a vertical rotary pump with reversible operation. Basically, it consists of two components - the mixing equipment, including shaft and the pumping device, and the draft tube. The pumping device is inserted and adjusted in the special upper draft tube bell mouth. The sludge is pumped at a velocity of 3 m/s upward or downward through the draft tube. Draft Tube The draft tube connects the two critical digester zones where the requirements are particularly demanding. The danger in the upper zone is that a supernatant sludge layer...
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The Mode of Operation The operation of the draft tube sludge mixer is reversible, i.e. the sludge can be moved upwards or downwards. Upwards mode of MFS During upward operation, the splash disc distributes the sludge over the sludge surface area softening the supernatant sludge layer and destroying part of the scum built up during the process. In the same way the foam build up will be controlled. Downwards mode of MFS During downward operation, the softened supernatant sludge layer, the scum and foam will be sucked down the draft tube and remixed with the digester contents. The high...
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Main process requirements for the mixing device in anaerobic digester: Pumping Technology For A Better Future
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All Rights Reserved - SIHI Group BV EUROPE Sterling Fluid Systems (Austria) Wien Tel. +43 (0) 1 680 050 sales_austria@sterlingsihi.de Sterling Fluid Systems (Belgium) Groot-Bijgaarden Tel. +32 (0) 2 481 7711 sales_be@sterlingfluid.com Sterling SIHI (Bulgaria) Sofia-llinden Tel. +359 (0) 2 8228311 office@sterlingsihi.bg Sterling Fluid Systems (Czech Rep.) Olomouc Tel. +420 587 433 651 sterling@sterling.cz Sterling Fluid Systems (France) Trappes Tel. +33 (0) 1 34 823 900 sales.france@sterlingfluid.com Sterling SIHI (Germany) Itzehoe Tel. +49 (0) 4821 771 04 sales@sterlingsihi.de Sterling...
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