Inorganic Chemicals Industry >
Study on preparation of sludge biochar and its adsorption performance for phosphorus
Received date: 2020-10-28
Online published: 2021-07-08
Sewage sludge and fly ash were used as raw materials and zinc chloride solution with mass fraction of 30% was used as activator to prepare sludge biochar calcined at different temperatures,the sludge biochar was used to treat phosphorus containing wastewater.The effect of sludge biochar on phosphorus removal was investigated through single factor static adsorp-tion experiment and its adsorption mechanism was explored.The results showed that the sludge biochar prepared at 300 ℃ had better phosphorus removal effect.The characterization analysis of raw materials and sludge biochar by scanning electron microscopy(SEM),specific surface analyzer and fourier infrared spectroscopy(FT-IR) showed that the morphology and surface groups of sludge biochar were significantly changed after calcination,there were many microvoids on the surface of the sample after calcination,and the specific surface area increased to 5.51 m2/g;under the condition of initial mass concent-ration of phosphorus 50 mg/L and the amount of adsorbent 16 g/L,the adsorption reached equilibrium in 90 minutes,and the removal rate of phosphorus was 93.73%;the adsorption process conformed to the quasi second order kinetic equation and the freundlich isotherm adsorption model,and the maximum saturated adsorption capacity was 9.615 mg/g;the whole adsorption process Δ G 0<0 and ΔH0<0,which was a spontaneous exothermic process.In addition to physical adsorption,the adsorption process also involves electron pair coordination between phosphate and—OH or C—O covalent bond of adsorbent,which was a physical-chemical composite adsorption; the fifth adsorption capacity of the adsorbent was 85.74% of the first adsorption capacity,showing good regeneration performance.
Ning Liang , Fujin Mo , Jierong Zhou , Junzheng Wang . Study on preparation of sludge biochar and its adsorption performance for phosphorus[J]. Inorganic Chemicals Industry, 2021 , 53(6) : 174 -179 . DOI: 10.19964/j.issn.1006-4990.2020-0513
[1] | 张海婷, 张永敏, 王天慧, 等. 镧改性介孔材料对砷、磷的吸附[J]. 环境工程学报, 2019,13(8):1791-1799. |
[2] | 程婷, 陈晨, 吴伟, 等. 粉煤灰合成沸石对磷酸根离子、氟离子与六价铬离子的竞争吸附研究[J]. 材料导报, 2015,29(S1):305-309. |
[3] | 石家豪, 韩非, 邱磊, 等. 复合改性粉煤灰对磷的吸附性能[J]. 化工环保, 2020,40(2):180-185. |
[4] | Zuo Y, Fu X N, Chen Y, et al. Phosphorus removal from wastewater using a lanthanum oxide-loaded ceramic adsorbent[J]. Adsorption, 2016,22(8):1091-1098. |
[5] | Ozacar M. Adsorption of phosphate from aqueous solution onto alu-nite[J]. Chemosphere, 2003,51(4):321-327. |
[6] | 何荔枝, 王美城, 余国豪, 等. 城市污水厂剩余污泥对水中F-的吸附性能研究[J]. 工业水处理, 2020,40(1):44-47. |
[7] | 张长飞, 丁克强, 李红艺, 等. 污泥粉煤灰混合制备活性炭及其性能研究[J]. 化工装备技术, 2014,35(2):14-17. |
[8] | Vieira G E G, Rêgo F, Teixeira L F, et al. Green bio-oil obtained from digested sewage sludge:new substitute bio-fuel to diesel oil in thermoelectric plants[J]. Energy Procedia, 2017,136:463-467. |
[9] | Figueiredo C C, Chagas J K M, Silva J, et al. Short-term effects of a sewage sludge biochar amendment on total and available heavy me-tal content of a tropical soil[J]. Geoderma, 2019,344:31-39. |
[10] | Alonso A, Ruiz V, Blanco C, et al. Activated carbo produced from Sasol-Lurgi gasifier pitch and its application as electrodes in su-percapacitors[J]. Cabon, 2006,44(3):441-446. |
[11] | 陈林, 平巍, 闫彬, 等. 不同制备温度下污泥生物炭对Cr(Ⅵ)的吸附特性[J]. 环境工程, 2020,38(8):119-124. |
[12] | 周光红, 项学敏, 李厚芬, 等. 粉煤灰对水溶液中磷的吸附性能及机理[J]. 环境工程学报, 2012,6(8):2600-2606. |
[13] | 孙晓菲, 陈桂芳, 安东海, 等. 粉末活性焦对水中磷酸盐的吸附性能[J]. 中国环境科学, 2019,39(9):3797-3806. |
/
〈 |
|
〉 |