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Application standard of flocculant in 3 phase decanter centrifuge

May 02, 2018

In order to effectively handle difficult-to-treat sewage and sludge, a 3 phase decanter centrifuge is often used for compact dewatering. The conventional practice is to add flocculants during the stoppage process to improve the treatment of sewage and sludge. It can be seen that flocculants can promote better results for 3-phase decanter centrifuges, so which standard and dosage must be used to achieve better results.


The first thing to consider is the characteristics of sewage and sludge. The different properties directly affect the sludge dewatering effect. Generally, the more difficult the sludge dewatering, the larger the amount of sludge flocculant, the smaller the size of sludge particles, and the greater the amount of flocculant used. The high organic content and alkalinity in the sludge will also lead to increased consumption.


Therefore, for the sludge with high organic content, cationic organic polymer is more effective. The higher the organic content, the more cationic organic polymer with higher polymerization degree should be used. For inorganic-based sludge, anionic organic polymer flocculants can be considered. In addition, the solid content of sludge also affects the dosage. The higher the solid content of common sludge, the greater the amount of use.


There is the pH value of sewage and sludge. The hydrolysis reaction of aluminum salt is greatly affected by the pH value, and the optimal pH range for aggregation reaction is 5-7. High iron salts are less affected by pH and the optimal pH range is 6-11. The ferrous salt in sludge with a pH of 8 to 10 can be oxidized into Fe(OH) and flocs with relatively low solubility.


Therefore, when selecting inorganic salts, first consider the detailed pH value of the dewatered sludge. If the pH value deviates from the optimal range of its reunification, it is better to change the use of the other, otherwise it is recommended that the 3 phase decanter centrifuge be used for contamination. Before the mud is stopped, add acid or alkali to adjust the pH of the sludge.


In addition to the selection of flocculants for the use of 3 phase decanter centrifuge, it is also necessary to master the skills of removing the feeding tubes of the equipment. Generally, the connection bolts of the flexible flexible connecting short tube and the centrifuge feeding tube are generally dismantled and released. Feed the bolts on the socket and pull out the feed tube. However, it should be noted that the position of the feeding pipe should be marked before disassembly to facilitate resetting. Remove the fixing screws of the main and auxiliary motor pulley guard housings and remove the main and auxiliary motor pulley guard housings.