Landfill leachate is a very typical high-concentration refractory wastewater containing a large amount of harmful organic matter, inorganic salts and heavy metals. Most degradable organic matter can be effectively treated by membrane bioreactor (MBR) combined biochemical process (such as denitrification + nitrification + denitrification + ultrafiltration), but due to the high content of refractory organic matter, heavy metals and dissolved inorganic salts, it is completely It is impossible to meet the requirements of harmless waste disposal by relying on biochemical treatment and filtration processes. Nanofiltration and reverse osmosis membrane process is a physical separation technology. Nanofiltration membrane can effectively separate most of the residual organic matter and polyvalent inorganic salts (including heavy metals) in biochemical processes. Inorganic. The main source of municipal waste is domestic waste, and the composition of leachate produced by different cities, climates and seasons, as well as the management and use time of landfills, will vary greatly. However, for the nanofiltration and reverse osmosis systems used as terminal treatment, we are mainly concerned with water quality indicators such as COD, alkalinity, hardness, insoluble salts and heavy metals that are likely to cause fouling of the membrane system. After the leachate is treated by a combined biochemical process, the content of refractory organic matter is reflected in COD, the alkalinity (mainly HCO3-) is a direct product of organic carbon oxidation, and the hardness has nothing to do with heavy metals and biochemical processes, and comes directly from municipal waste.
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