Gao Yifan, Croze Benjamin, Birch Quinn T, Nadagouda Mallikarjuna N, Mahendra Shaily
Department of Civil and Environmental Engineering, University of California, Los Angeles, 580 Portola Plaza, Los Angeles, CA 90095, USA.
Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221, USA.
Water Res X. 2023 Apr 30;19:100181. doi: 10.1016/j.wroa.2023.100181. eCollection 2023 May 1.
The synthetic dye discharge is responsible for nearly one-fifth of the total water pollution from textile industry, which poses both environmental and public health risks. Herein, a solid substrate inoculated with fungi is proposed as an effective and environmentally friendly approach for catalyzing organic dye degradation. was inoculated onto commercially available solid substrates such as sorghum, bran, and husk. Among these, grown on sorghum (PO-SORG) produced the highest enzyme activity and was further tested for its dye biodegradation ability. Four dye compounds, Reactive Blue 19 (RB-19), Indigo Carmine, Acid Orange 7, and Acid Red 1 were degraded by PO-SORG with removal efficiencies of 93%, 95%, 95%, and 78%, respectively. Under more industrially relevant conditions, PO-SORG successfully degraded dyes in synthetic wastewater and in samples collected from a local textile factory, which reveals its potential for practical usage. Various biotransformation intermediates and end-products were identified for each dye. PO-SORG exhibited high stability even under relatively extreme temperatures and pH conditions. Over 85% removal of RB-19 was achieved after three consecutive batch cycles, demonstrating reusability of this approach. Altogether, PO-SORG demonstrated outstanding reusability and sustainability and offers considerable potential for treating wastewater streams containing synthetic organic dyes.
合成染料排放占纺织工业总水污染的近五分之一，这带来了环境和公共健康风险。在此，提出一种接种真菌的固体基质作为催化有机染料降解的有效且环保的方法。将其接种到高粱、麸皮和稻壳等市售固体基质上。其中，在高粱上生长的（PO-SORG）产生的酶活性最高，并进一步测试其染料生物降解能力。PO-SORG对活性蓝19（RB-19）、靛蓝胭脂红、酸性橙7和酸性红1这四种染料化合物进行了降解，去除效率分别为93%、95%、95%和78%。在更符合工业实际的条件下，PO-SORG成功降解了合成废水中以及从当地纺织厂采集的样品中的染料，这揭示了其实际应用潜力。针对每种染料鉴定了各种生物转化中间体和终产物。即使在相对极端的温度和pH条件下，PO-SORG仍表现出高稳定性。连续三个批次循环后，RB-19的去除率超过85%，证明了该方法的可重复使用性。总之，PO-SORG表现出出色的可重复使用性和可持续性，为处理含有合成有机染料的废水流提供了巨大潜力。
