| abstract |
The invention relates to the field of water treatment, in particular to a novel membrane treatment system and method for wastewater hardness removal. The novel membrane treatment method for wastewater hardness removal provided by the embodiment of the invention comprises the following steps: removing hardness of the salt-containing wastewater through ion exchange by using a Na type cation exchanger and a weak acid cation exchanger; and concentrating and separating the salt water containing sodium ions obtained after ion exchange to obtain sodium chloride salt water, wherein the sodium chloride salt water is used as a regeneration liquid of the Na-type cation exchanger. According to the membrane treatment method provided by the invention, the hardness of the high-salinity wastewater is reduced through the Na-type cation exchanger and the weak-acid cation exchanger, and a large amount of chemical agents are not required to be added, so that the amount of chemical sludge is reduced, and the operation cost is reduced; in addition, the sodium chloride brine can be obtained after the brine containing sodium ions generated after ion exchange is treated, and can be used for regenerating Na-type cation exchangers, so that the water regeneration and the salt in the incoming water can be fully realized. |