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Removal of colour and lignin from paper mill wastewater using activated carbon from plastic mix waste
International Journal of Environmental Science and Technology ( IF 3.0 ) Pub Date : 2021-04-05 , DOI: 10.1007/s13762-021-03263-9
V. Gupta , N. K. Bhardwaj , R. K. Rawal

The study aimed at the use of char produced during pyrolysis of mix plastic waste. It further focused on producing activated carbon from char and also found its efficacy as efficient adsorbent for treatment of pulp and paper mill wastewater. The activated carbon was characterized in comparison with raw char for their physical, surface and adsorptive properties. Batch type adsorption experiments were carried out using 100 ml wastewater to observe the individual effectiveness using five different variables such as adsorbent dose (0.25–2.0 g), pH (6–10), time (5–24 h), agitation speed (100–200 rpm) and temperature (30–50 °C) by keeping other variables constant which helped to find out the effective range of all the variables. The competency was evaluated on the basis of colour and lignin content of pulp and paper industry wastewater. Once the effective range of different variables was identified, the statistical analysis was conducted to monitor the mutual impact on the reduction in colour and lignin contents in wastewater. From the statistical design applied, the best result was obtained at activated carbon dose (1.25 g), pH (8.0), contact time (7 h), agitation speed (184 rpm) and temperature (40 °C). The study resulted in reduction of 96.48% in colour and 94.25% in lignin at optimized condition in comparison with 87.37 and 80.44%, respectively, at unoptimized conditions. A potential increase in reduction of 9.0% in colour and 14.0% in lignin content was achieved after optimization through statistical design that confirmed its usefulness.



中文翻译:

使用塑料混合废料中的活性炭去除造纸厂废水中的颜色和木质素

该研究旨在利用混合塑料废料热解过程中产生的炭。它进一步致力于由焦炭生产活性炭,并发现其作为处理纸浆和造纸厂废水的有效吸附剂的功效。与原料炭相比,活性炭的物理,表面和吸附性能均得到了表征。使用100 ml废水进行分批式吸附实验,使用五个不同的变量(例如吸附剂剂量(0.25–2.0 g),pH(6–10),时间(5–24 h),搅拌速度(100)观察个体有效性) –200 rpm)和温度(30–50°C)保持其他变量不变,这有助于找出所有变量的有效范围。根据纸浆和造纸工业废水的颜色和木质素含量评估能力。一旦确定了不同变量的有效范围,便进行统计分析以监测对废水中颜色和木质素含量减少的相互影响。从应用的统计设计中,在活性炭剂量(1.25 g),pH(8.0),接触时间(7 h),搅拌速度(184 rpm)和温度(40°C)下可获得最佳结果。该研究导致在优化条件下颜色降低了96.48%,在木质素中降低了94.25%,而在未优化条件下分别降低了87.37和80.44%。通过统计设计进行了优化,确认了其有用性后,可实现颜色减少9.0%和木质素含量减少14.0%的潜在增加。进行统计分析以监测对废水中颜色和木质素含量减少的相互影响。从应用的统计设计中,在活性炭剂量(1.25 g),pH(8.0),接触时间(7 h),搅拌速度(184 rpm)和温度(40°C)下可获得最佳结果。研究结果表明,与未优化条件下相比,优化条件下的颜色降低了96.48%,木质素降低了94.25%,相比之下,未优化条件下的降低分别为87.37和80.44%。通过统计设计进行了优化,确认了其有用性后,可实现颜色减少9.0%和木质素含量减少14.0%的潜在增加。进行统计分析以监测对废水中颜色和木质素含量减少的相互影响。从应用的统计设计中,在活性炭剂量(1.25 g),pH(8.0),接触时间(7 h),搅拌速度(184 rpm)和温度(40°C)下可获得最佳结果。研究结果表明,与未优化条件下相比,优化条件下的颜色降低了96.48%,木质素降低了94.25%,相比之下,未优化条件下的降低分别为87.37和80.44%。通过统计设计进行了优化,确认了其有用性后,可实现颜色减少9.0%和木质素含量减少14.0%的潜在增加。搅拌速度(184 rpm)和温度(40°C)。研究结果表明,与未优化条件下相比,优化条件下的颜色降低了96.48%,木质素降低了94.25%,相比之下,未优化条件下的降低分别为87.37和80.44%。通过统计设计进行了优化,确认了其有用性后,可实现颜色减少9.0%和木质素含量减少14.0%的潜在增加。搅拌速度(184 rpm)和温度(40°C)。研究结果表明,与未优化条件下相比,优化条件下的颜色降低了96.48%,木质素降低了94.25%,相比之下,未优化条件下的降低分别为87.37和80.44%。通过统计设计进行了优化,确认了其有用性后,可实现颜色减少9.0%和木质素含量减少14.0%的潜在增加。

更新日期:2021-04-06
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