Wastewater of that washing of soil that results in concentrations of inorganic salts, toxic metals, chelating agents, and refractory dissolved organic matter may threaten the surrounding environment. Simultaneously, the removal of contaminants and the recovery of resources from this wastewater remain challenging. This study investigated the probability of a novel combined treatment (chemical precipitation + bipolar membrane electrodialysis (BMED) + activated carbon (AC) adsorption) on salt-containing soil washing wastewater treatment. The results showed that the proposed combined treatment could achieve proficient removal of heavy metals, inorganic salts, and total organic carbon (TOC) with low energy consumption (removal efficiency of heavy metals and inorganic salts > 94%; TOC removal > 58%). Meanwhile, the efficient recovery of acid and alkali could also be realized in the proposed treatment (acid-production rate = 7.76 ± 0.38 mmol/h and base-production rate = 5.47 ± 0.42 mmol/h at 50 mA/cm²). The mechanism result indicated that the chemical precipitation process could achieve high removal of heavy metals. Then, the BMED process induced an efficient separation of organic matter and inorganic salts. Accordingly, the AC adsorption process could efficiently remove organics. Preliminary economic evaluation results revealed that the combined process could proficiently treat the soil washing wastewater with economic viability. Together, these findings provide meaningful information for soil washing wastewater treatment with resource recovery.

土壤洗涤产生的废水会导致无机盐、有毒金属、螯合剂和难溶解的有机物浓度升高，可能会威胁到周围环境。同时，从这些废水中去除污染物和回收资源仍然具有挑战性。本研究调查了新型联合处理（化学沉淀+双极膜电渗析（BMED）+活性炭（AC）吸附）对含盐土壤洗涤废水处理的可能性. 结果表明，所提出的联合处理能够以低能耗实现重金属、无机盐和总有机碳（TOC）的高效去除（重金属和无机盐的去除效率> 94%；TOC去除> 58%）。同时，该处理还可以实现酸碱的高效回收（产酸速率= 7.76 ± 0.38 mmol/h，产碱速率= 50 mA/cm ²）。机理结果表明化学沉淀该工艺可实现重金属的高去除率。然后，BMED 过程诱导有机物和无机盐的有效分离。因此，AC吸附过程可以有效地去除有机物。初步经济评价结果表明，该联合工艺可有效处理土壤冲洗废水，具有经济可行性。总之，这些发现为土壤洗涤废水处理和资源回收提供了有意义的信息。