Abstract：To treat high-concentration wastewater while realizing the utilization of red mud as a resource. The modified red mud composite material (MgO-RM) was prepared through the red mud loaded with magnesium oxide for efficient simultaneous recovery of nitrogen and phosphorus in wastewater. The effects of the initial pH, the mass ratio of nitrogen to phosphorus and the dosage of MgO-RM on the recovery performance were investigated, and kinetic models and isothermal adsorption models examined the recycling characteristics. Meanwhile, the recovery mechanism was revealed by characterizing the MgO-RM before and after the reaction through FTIR, XRD, SEM, and BET testing methods. The results showed that magnesium oxide was effectively loaded on the surface of red mud under an optimal condition: initial pH=3, nitrogen and phosphorus mass ratio=3:5 and MgO-RM dosage=4g/L. The ammonia nitrogen and phosphate recovery efficiency can be reached as 65 % and 90 %, respectively. Such a recovery process can be explained by the Langmuir model and the quasi-two-order kinetic model. The adsorption behavior was in line with the monolayer adsorption, in which chemical adsorption plays a dominant role. The maximum ammonia nitrogen and phosphate recovery capacity can be achieved as 61.50mg/g and 140.66mg/g, separately. The above results concluded that the recovery mechanism may include physical adsorption, ion exchange, complexation reaction and chemical precipitation, in which struvite precipitation is the dominant process.
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