In the sewage treatment plant, sludge anaerobic digester What is the role? Today for everyone to analyze the sludge anaerobic digestion tank related functions. What is the anaerobic digestion of sludge? What is the difference between anaerobic treatment of high concentration wastewater? Sludge anaerobic digestion is the use of anaerobic microorganisms through hydrolysis, acidification, methane and other processes, most of the sludge solid organic matter hydrolysis, liquefaction and the final decomposition of the process. Methanogenic bacteria eventually convert the carbon in the sludge organics to methane and are released from the sludge to stabilize the sludge. Anaerobic digestion of sludge and high concentrations of wastewater anaerobic treatment is different. The organic matter in the waste water is mainly in the dissolved state, while the organic matter in the sludge is mainly in the solid state. According to the different operation temperature, anaerobic digestion of sludge is divided into two kinds of medium temperature digestion (30 ~ 37 ℃) and high temperature digestion (45 ~ 55 ℃). Due to the high energy consumption of high-temperature digestion, large-scale sewage treatment plants are generally not used, so common sludge anaerobic digestion are actually moderate temperature digestion. Sludge anaerobic digester What are the basic requirements? (1) When two levels of digestion are used, the ratio of the residence time of the primary digester to the primary digester may be 1: 1, 2: 1 or 3: 2, of which 2: 1 is the most used: Of the liquid level must be able to meet the needs of sludge gravity flow to a digester, a higher groundwater level, we must consider the antifloat pool body, the digester for cleaning the best choice when the lower groundwater level. (2) Sludge anaerobic digesters generally use reinforced concrete structures with good water tightness, airtightness and corrosion resistance. The diameter of the anaerobic digesters is generally 6 to 35 m. The ratio of the total height to the diameter is 0.8 to 1.0. The inner diameter and the height of the cylinder The ratio is 2: 1. The slope of the bottom is 8%, the height of the top of the pool from the mud surface is more than 1.5m, the diameter of the top gas gathering hood is 2m and the height is 1-2m. The diameter and height of the gas gathering hood of the large digester are respectively better than 4m and 2m . (3) sludge anaerobic digester generally set into the mud pipe, mud pipe, the supernatant discharge pipe, overflow pipe, circulating mixing pipe, biogas out of the tube, the sampling tube, manhole, manometry , Temperature measuring pipe, etc. Generally, the mud pipe should be arranged above the mud in the pool. The position, quantity and form of the mud pipe should be agitated evenly to break the scum. The minimum pipe diameter of the sludge pipe is 150 mm. The pipe should be corrosion- Corrosion treatment, at the same time equipped with pipe cleaning equipment. (4) The supernatant discharge pipe can be set at different heights 3 ~ 4, the minimum diameter of 75mm, and the air cut off measures; overflow pipe into the mud pipe larger than the diameter of not less than 200mm, Overflow height to ensure that the pool is in a positive pressure state; emptying pipe and the mud pipe can share the same pipe; sampling pipe minimum diameter of 100mm, at least in the pool and the pool edge of a root, and reached below the mud 0.5 m; manhole to be two, and the location is reasonable. (5) The surrounding walls of the pool and the roof must be insulated. Sludge anaerobic digester What are the influencing factors? (1) temperature, pH, alkalinity and toxic substances are the main factors affecting digestion, the same mechanism of action and anaerobic wastewater treatment. (2) sludge age and dosing rate. In order to obtain a stable treatment effect, we must maintain a longer mud age. The degree of organic degradation is a function of the sludge age, not a function of organic matter entering the sludge.
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