李曈, 徐梦兰, 赵悦, 任舒阳, 王霄, 郭开祥, 李从举. 矿井水反渗透系统阻垢剂成分与阻垢机制研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.07.20.004
引用本文: 李曈, 徐梦兰, 赵悦, 任舒阳, 王霄, 郭开祥, 李从举. 矿井水反渗透系统阻垢剂成分与阻垢机制研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.07.20.004
Research on antiscalant ingredients and anti-scaling mechanism in mine wastewater reverse osmosis system[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.07.20.004
Citation: Research on antiscalant ingredients and anti-scaling mechanism in mine wastewater reverse osmosis system[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.07.20.004

矿井水反渗透系统阻垢剂成分与阻垢机制研究

Research on antiscalant ingredients and anti-scaling mechanism in mine wastewater reverse osmosis system

  • 摘要: 矿井水反渗透浓水中阻垢剂可以抑制Ca2+、Mg2+结晶沉淀,导致双碱法投药量高、除硬效果差,影响后续蒸发结晶分盐效果。探究反渗透系统中阻垢剂成分及阻垢机制,是实现Ca2+、Mg2+脱稳、解决深度除硬与零排放问题的关键。本文首先测定反渗透浓水水质条件,通过超滤分级、FTIR、UV-Vis和EEM光谱,分析得出溶解性有机物主要为分子量<3 kDa且含有羧基、醇/酚羟基与不饱和烃结构的微生物代谢产物和类腐殖酸物质。根据13C和31P NMR谱化学位移特征(甲基碳、季碳和碳-磷C-PO3H2结构),确定阻垢剂主要成分为羟基乙叉二磷酸(HEDP)。吸附去除88.55%总磷和38.86%COD后,双碱滴定结果表明,Ca2+沉淀完全所需碳酸根的投加量从2845.8 mg?L-1减少至826.8 mg?L-1,表明HEDP主要阻止Ca2+结晶成垢。重新利用HEDP复配,碳酸根投加量仅增加至1626.3 mg?L-1,说明吸附去除的部分有机物具有一定分散作用,可以抑制溶液中Ca2+结晶团聚。以上结果揭示HEDP与溶解性有机物的协同阻垢机制,为矿井水反渗透浓水中Ca2+、Mg2+深度去除提供重要理论依据和调控策略。

     

    Abstract: The antiscalant for the reverse osmosis(RO) system can inhibit the crystallization and precipitation of Ca2+ and Mg2+, resulting in a high dosage of hydroxide and carbonate, a low removal efficiency, and profoundly negative impacts on the evaporation crystallization of salt. It is crucial to explore the industrial antiscalant ingredient and anti-scaling mechanism in RO system, contributing to the in-depth hardness removal and zero discharge of wastewater. In this study, we have determined the water quality of RO concentrate and fractionated it by ultrafiltration. FTIR, UV-Vis, and EEM spectra results indicated that the dissolved organic matter in RO concentrate was mainly composed of microbial metabolites and humic acid substances with molecular weight <3 kDa, containing carboxyl, alcohol/phenol hydroxyl, and unsaturated hydrocarbon structure. According to 13C and 31P NMR spectra, chemical shift characteristics, including methyl carbon, quaternary carbon, and C-PO3H2 structures, have confirmed the main component of antiscalant is hydroxyethylidene-1,1-diphosphonic acid (HEDP). After removing 88.55% HEDP and 38.86% COD by adsorption, the amount of added carbonate for the complete precipitation of Ca2+ was reduced from 2845.8 mg?L-1 to 826.8 mg?L-1, indicating that HEDP dominantly hindered the Ca2+ crystallization. Even if it is prepared with HEDP again, the amount of carbonate was only increased to 1626.3 mg?L-1, demonstrating that the removed organic matter by adsorption has dispersion effects to inhibit the crystallization and aggregation of Ca2+. The above results have revealed the synergistic anti-scaling mechanism between HEDP and the dissolved organic matter to provide a significant theoretical and regulatory strategy for the in-depth hardness removal in RO concentrate.

     

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