Research on Phosphorus Removal Performance of Portland Blast Furnace Slag Cement
[1]Research on Phosphorus Removal Performance of Portland Blast Furnace Slag Cement.Research on Phosphorus Removal Performance of Portland Blast Furnace Slag Cement[J].Journal of Zhengzhou University (Engineering Science),2022,43(03):73-80.[doi:10.13705/j.issn.1671-6833.2021.06.007]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
43卷
Number of periods:
2022 03
Page number:
73-80
Column:
Public date:
2022-04-10
- Title:
- Research on Phosphorus Removal Performance of Portland Blast Furnace Slag Cement
- CLC:
- X703. 1
- DOI:
- 10.13705/j.issn.1671-6833.2021.06.007
- Abstract:
- This study aimed to solve the problem of deep purification of high concentration phosphorus wastewater and to explore the phosphorus removal potential of portland blast furnace slag cement.The adsorption of the wastewater containing 150 mg/L TP on portland blast furnace slag cement was discussed.Combined with scanning electron microscopy(SEM)and X-ray diffraction(XRD), the surface morphology and crystal structure of portland blast furnace slag cement before and after phosphorus adsorption were characterized and analyzed.The results of adsorption kinetics experiments showed that portland blast furnace slag cement as a adsorbent could treat high phosphorus-containing wastewater, removal rate up to 90.3%, adsorption capacity up to 27 mg/g, the adsorption kinetic process could be well explained by using pseudo-second-order kinetic model and intra-particle diffusion model, the dephosphorization rate is mainly limited by the chemical reaction rate, compared with surface adsorption, intra-particle diffusion is the decisive step in the adsorption process.In addition, isotherm studies showed that phosphorus adsorption on portland blast furnace slag cement fitted the Freundlich and Langmuir model, with the correlation coefficients over 0.97.The results indicated that both single-layer adsorption and multi-layer adsorption occurred in portland blast furnace slag cement, and the non-uniform active sites on the surface were slightly stronger than the uniform active sites, the maximum phosphorus adsorption capacity determined by Langmuir isotherm plot was 47 mg/g.Through orthogonal experiments, the optimal reaction conditions were as follows: pH is 7, initial phosphorus concentration is 150 mg/L, dosage is 5 g/L, contact time is 18 h.The portland blast furnace slag cement can effectively neutralize the excess acid and alkali, and has good buffering characteristics, which may be related to the protonation and deprotonation of the metal ions, the ligand exchange in chemisorption was the main mechanism of phosphorus removal.Portland blast furnace slag cement is suitable for high concentration of phosphorus containing wastewater, also suitable for pH unstable phosphorus containing wastewater.
- References:
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Last Update:
2022-05-02