Investigation on the adsorption and denitrification performance of modified reed material and its resource utilization

Abstract

In order to explore the resource utilization of nitrate nitrogen in wastewater and the high-value utilization mode of excess reed resources in Baiyang Lake, this paper prepared modified reed straw(MRS) with waste reed straw(RS) as raw material. Through adsorption desorption regeneration experiments, MRS recycling application experiments and SEM, XPS, FT-IR characterization methods, the potential use of MRS in the removal of nitrate nitrogen in wastewater and its recycling was explored. The results showed that the maximum adsorption capacity of MRS for nitrate was 8.54 mg/g, and its adsorption behavior was in line with the Freundlich adsorption isotherm model. The adsorption process was more in line with the pseudo second-order adsorption kinetics model. After 9 adsorption-desorption-regeneration cycles, the adsorption performance of the adsorbent did not significantly decrease, the material adsorbing nitrate nitrogen(MRS-NO3-) used as fertilizer played a significant role in promoting plant growth, and the pH of the experimental soil did not change. In conclusion,MRS is a low-cost, efficient and harmless nitrate adsorbent. This study preliminarily realized the resource utilization of nitrate nitrogen in wastewater and the high-value utilization mode of excess reed resources in Baiyang Lake through the technical route of adsorption-desorption-regeneration-recycling.

Keywords

• reed straw
• resource utilization
• adsorbent
• wastewater
• nitrate nitrogen