Enhanced biodegradation of lignin and lignocellulose constituents in the pulp and paper industry black liquor using integrated magnetite nanoparticles/bacterial assemblage

IF 5.7 3区 环境科学与生态学 Q1 WATER RESOURCES
Ebtesam EL-Bestawy, Sahar W. M. Hassan, Amany A. Mohamed
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Abstract

The study was designed to explore the efficiency of magnetite nanoparticles (Fe3O4 NPs)/bacterial cell assembly to biodegrade lignin and lignocellulose, decontaminate pulp and paper-contaminated wastewater and optimize lignin adsorption by Fe3O4 NPs. Water samples were collected from three paper and carton manufacturing companies, Alexandria Governorate, Egypt. Pseudomonas otitidis MCC10330, the most active and promising strain among 10 previously screened indigenous and exogenous isolates, was selected and decorated with magnetic Fe3O4 Nanoparticles, that were prepared by the co-precipitation method, characterized and used to decontaminate paper and pulp effluent in a batch mode bioassay for 4 h. Fe3O4 NPs/bacterial cell assembly achieved the highest removals (64.1, 52.0, 54.3 and 66.6%) of TSS, COD, BOD, and Total Tannin and Lignin after 1, 4 and 4 h, reaching residual concentrations (RCs) of 322, 216, 112 and 7 mg/L, which are still slightly higher (5.35, 2.7 and 1.86-fold) than their maximum permissible limits (MPLs), respectively. RCs of pH, DO and TDS in the treated effluent are accepted for safe discharging. Maximum lignin adsorption and removal (82.14%) using Fe3O4 NPs was achieved at the optimized conditions (pH 6, Fe3O4 NPs dosage of 100 mg and 10 min contact time). Results confirmed that the proposed magnetite-coated Pseudomonas otitidis treatment system is highly efficient and recommended to treat the highly contaminated pulp and paper wastewater. Also, as far as we know, this integrated assemblage is the first time to be used as a novel, very promising, eco-friendly, renewable and economical biotechnological approach to minimize/eliminate the involved pollutants with the least running time.

Abstract Image

利用集成磁铁矿纳米颗粒/细菌组合物增强制浆造纸工业黑液中木质素和木质纤维素成分的生物降解能力
本研究旨在探索磁铁矿纳米粒子(Fe3O4 NPs)/细菌细胞组装对生物降解木质素和木质纤维素、净化纸浆和造纸污染废水以及优化 Fe3O4 NPs 对木质素吸附的效率。水样采集自埃及亚历山大省的三家造纸和纸箱制造公司。通过共沉淀法制备了磁性 Fe3O4 纳米粒子,并对其进行了表征,在批量生物测定中用于净化纸张和纸浆废水 4 小时。在 1、4 和 4 小时后,Fe3O4 NPs/细菌细胞组件对 TSS、COD、BOD、总单宁和木质素的去除率最高(64.1%、52.0%、54.3% 和 66.6%),残留浓度(RCs)分别为 322、216、112 和 7 mg/L,仍略高于其最大允许极限(MPLs)(5.35、2.7 和 1.86 倍)。经处理的污水中的 pH 值、溶解氧和总悬浮微粒的 RC 值均符合安全排放的要求。在优化条件下(pH 值为 6、Fe3O4 NPs 剂量为 100 毫克、接触时间为 10 分钟),使用 Fe3O4 NPs 可实现最大的木质素吸附和去除率(82.14%)。研究结果证实,所提出的磁铁矿包覆奥氏假单胞菌处理系统具有很高的效率,建议用于处理高污染的制浆造纸废水。此外,据我们所知,这种集成组件是首次作为一种新型、非常有前景、生态友好、可再生和经济的生物技术方法来使用,可在最短的运行时间内最大限度地减少/消除所涉及的污染物。
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来源期刊
Applied Water Science
Applied Water Science WATER RESOURCES-
CiteScore
9.90
自引率
3.60%
发文量
268
审稿时长
13 weeks
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