评价明矾强化牛毛废生物炭处理植物油炼制废水的效果

Sustainable Chemistry One World Pub Date : 2025-04-25 DOI:10.1016/j.scowo.2025.100061

Goufdour Alexis , Cornelius Tsamo , Wangmene Bagamla , Abba Paltahe

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引用次数: 0

摘要

植物油废水颜色鲜艳，含有丰富的有机和无机污染物，对人类、生态系统和环境具有潜在的影响。牛毛生物炭具有良好的吸附性能，明矾可以增强牛毛生物炭的吸附性能，但此前尚未进行过试验。使用过的生物炭/明矾吸附剂作为肥料的测试很少，尽管生物炭的有机肥料作用可以通过从流出物中吸附的有机和无机物（如磷酸盐）来增强。本研究旨在评价明矾强化牛毛废生物炭对植物油炼制废水中色素和硫酸盐的去除效果，并研究使用过的吸附剂对玉米生长性能的影响。在465 °C下热解生成的生物炭产率为69.36 %，并通过FTIR， XRD和SEM-EDX分析进行了表征。考察了不搅拌接触时间、搅拌时间、生物炭浓度、pH值、温度等参数对脱色效果和硫酸盐脱除效果的影响。以水处理后回收的生物炭/明矾作为肥料，对玉米生长性能进行了34 d的试验。这种生物炭富含碳，多孔且含有C-O和OH-基团。除色率均高于硫酸盐除色率。例如，在不搅拌的情况下，在40 分钟内脱色率最高可达98 %，而硫酸盐在10 分钟内脱色率最高可达74 %。当搅拌过程时，在20 min内达到平衡，颜色和硫酸盐的去除率分别为95%和77 %。100 %的颜色在pH 4-10和pH 6下去除，以获得最大的硫酸盐去除率。在25 °C和20 °C时，硫酸盐的最大去色率分别为97 %和86 %。对于硫酸盐，KL = 478.468 ABS g−1比0.619 L g−1更有利于脱色。处理后的再生吸附剂表现出较好的玉米生长性能（第34天，再生吸附剂处理的平均叶面积指数为282.2 ± 36.7，而对照组为210.5 ± 13.5）。添加明矾的生物炭对改善废水的质量非常有效，回收的吸附剂对玉米生长有促进作用。

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Evaluating the efficiency of cattle hair waste biochar fortified with alum on the treatment of vegetable oil refinery wastewater

Vegetable oils wastewater is very coloured and rich in organic and inorganic contaminants with potential effects on humans, ecosystem and environment at large. Cattle hair biochar has good adsorbent properties which can be enhanced by alum but has not been tested before. Testing of used biochar/alum adsorbent as fertilizer is scarce despite the organic fertilizer role of biochar which can be enhanced by organics and inorganics like phosphate adsorbed from the effluent. This study is aimed at evaluating the efficiency of cattle hair waste biochar fortified with alum in removing colour and sulfate from vegetable oil refinery wastewater and investigating the effects of used adsorbents on the growth performance of maize. Biochar produced by pyrolysis at 465 °C gave a yield of 69.36 % and was characterized using FTIR, XRD, and SEM-EDX analysis. Colour and sulfate removal were studied using the parameters such as contact time without stirring, stirring time, concentration, pH dose of biochar and temperature were studied. Biochar/alum recovered after water treatment was tested as fertilizer on growth performance of maize for 34 days. This biochar is rich in carbon, very porous and contain C-O and OH^- groups. The percentage removal of colour removed was higher than that of sulfate for all the parameters. For example, colour removal attained a maximum of about 98 % in 40 mins without stirring, against 74 % in 10 mins for sulfate. When the process is stirred, equilibrium is attained in 20 mins for both colour and sulfate with respective removal efficiencies of 95 and 77 %. 100 % colour was removed at pH 4–10 against pH 6 for maximum sulfate removal. Maximum colour removal of 97 % occurred at 25 °C and 86 % for sulfate at 20 °C. Colour removal is more favourabele K_L = 478.468 ABS g⁻¹ compared to 0.619 L g⁻¹ for sulfate. Recycled adsorbent after treatment showed better maize growth performance than the control (the average leaf area index was 282.2 ± 36.7 on day 34 for recycled adsorbent treatment compared to 210.5 ± 13.5 for the control). Tested biochar fortified with alum is very efficient in improving the quality of studied wastewater, and the recycled adsorbents enhance maize growth.

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Sustainable Chemistry One World

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