Efficient and sustainable removal of linear alkylbenzene sulfonate in a membrane biofilm: Oxygen supply dosage impacts mineralization pathway

IF 7.2 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Water Research X Pub Date : 2024-10-24 DOI:10.1016/j.wroa.2024.100268
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Abstract

Linear alkylbenzene sulfonate (LAS) can be thoroughly mineralized within sufficient oxygen (O2), but which is energy intensive and may causes serious foaming problem. Although cometabolism can achieve efficient LAS removal within a wide range of O2 dosages, how O2 dosage systematically affects LAS metabolic pathway is still unclear. Here, membrane aerated biofilm reactor (MABR) enabled accurate O2 delivery and bulk dissolved oxygen (DO) control. MABR achieved efficient removal of LAS (>96.4 %), nitrate (>97.8 %) and total nitrogen (>96.2 %) at the three target DO conditions. At high DO condition (0.6 mg/L), LAS was efficiently removed by aerobic mineralization (predominant) coupled with aerobic denitrification biodegradation with the related functional enzymes. Pseudomonas, Flavobacterium, Hydrogenophaga, and Pseudoxanthomonas were dominant genus contributing to four possible LAS aerobic metabolic pathways. As O2 dosage reduced to only 29.7 % of the demand for LAS mineralization, O2 facilitated LAS activation, benzene-ring cleavage and a portion of respiration. NO3--N respiration-induced anaerobic denitrification also contributed to ring-opening and organics mineralization. Desulfomicrobium and Desulfonema related two possible anaerobic metabolic pathways also contributed to LAS removal. The findings provide a promising strategy for achieving low-cost high LAS-containing greywater treatment.

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在膜生物膜中高效、可持续地去除线性烷基苯磺酸盐:供氧量对矿化途径的影响
线性烷基苯磺酸盐(LAS)可以在充足的氧气(O2)条件下被彻底矿化,但这需要消耗大量能量,而且可能导致严重的泡沫问题。虽然在氧气用量较宽的范围内,彗星代谢可以实现高效去除 LAS,但氧气用量如何系统地影响 LAS 的代谢途径仍不清楚。在这里,膜充气生物膜反应器(MABR)实现了精确的氧气输送和大量溶解氧(DO)控制。在三个目标溶解氧条件下,膜充气生物膜反应器都能高效去除 LAS(96.4%)、硝酸盐(97.8%)和总氮(96.2%)。在高溶解氧条件下(0.6 毫克/升),LAS 通过好氧矿化(占主导地位)和好氧反硝化生物降解以及相关功能酶的作用被有效去除。假单胞菌、黄杆菌、嗜氢单胞菌和假黄单胞菌是主要的菌属,构成了四种可能的 LAS 好氧代谢途径。由于氧气用量仅占 LAS 矿化所需量的 29.7%,氧气促进了 LAS 的活化、苯环裂解和部分呼吸作用。NO3--N呼吸诱导的厌氧反硝化作用也有助于开环和有机物矿化。脱硫微生物(Desulfomicrobium)和脱硫水藻(Desulfonema)这两种可能的厌氧代谢途径也有助于去除 LAS。这些研究结果为实现低成本高含 LAS 中水处理提供了一种前景广阔的策略。
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来源期刊
Water Research X
Water Research X Environmental Science-Water Science and Technology
CiteScore
12.30
自引率
1.30%
发文量
19
期刊介绍: Water Research X is a sister journal of Water Research, which follows a Gold Open Access model. It focuses on publishing concise, letter-style research papers, visionary perspectives and editorials, as well as mini-reviews on emerging topics. The Journal invites contributions from researchers worldwide on various aspects of the science and technology related to the human impact on the water cycle, water quality, and its global management.
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