铁改性氧化铝吸附除磷性能研究

Study on Phosphorus Removal Performance by Adsorption of Activated Alumina Modified by Iron

文章中制备了一种铁改性活性氧化铝复合吸附剂,考察了投量、pH、共存阴离子对其吸附除磷的影响,并探究了其对实际二级出水中不同形态磷的去除效果。结果表明,该吸附剂的磷去除率随投量的增加而提高,在pH=2~7时除磷效果最佳,且在pH=4~10内金属稳定性优良,共存Cl^(-)、NO_(3)^(-)、SO_(4)^(2-)不影响其对H_(2)PO_(4)^(-)的最优选择性。在应用于实际二级出水时,具有良好的稳定性,可以有效地去除污水中96.87%的溶解性正磷酸盐,总磷满足《城市污水再生利用景观环境用水水质(GB/T18921-2019)》中景观回用水要求。

An iron-modified activated alumina composite adsorbent was prepared by surface modification of activated alumina with ferric chloride in this study.The effects of dosage,pH and coexisting anions on the phosphorus removal efficiency of the adsorbent were investigated,and the stability of the adsorbent was evaluated.The removal effect of different forms of phosphorus in actual secondary effluent by the adsorbent was further studied.The results showed that the phosphorus removal efficiency of iron-modified activated alumina increases with the increase of the dosage.The adsorbent had best phosphorus removal efficiency in the pH range of 2~7,and the adsorbent has good stability in the pH range of 4~10.The coexistences of Cl^(-),NO_(3)^(-) and SO_(4)^(2-) could not affect the optimal selectivity of to H_(2)PO_(4)^(-).When applied to the actual secondary effluent,the iron-modified activated alumina composite adsorbent had a good stability and can effectively remove 96.87%of the soluble reactive phosphorus,and the total phosphorus met the requirements of The Reuse of Urban Recycling Water-Water Quality Standard for Scenic Environment Use(GB/T18921-2019).