添加亚铁促进小球藻纯造粒处理海水养殖废水的可行性

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-05-01 DOI:10.1016/j.biteb.2025.102129

Junsheng Chen , Biao Zhang , Xiaojing Yang , Yuqi Liu , Ziyang Zhang , Weiwei Huang , Ziwen Zhao

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引用次数: 0

摘要

纯小球藻制粒速度慢，限制了其在海水养殖废水处理中的应用，需要提高制粒效率和去除污染物的策略。研究了10 mg/L Fe2+对小球藻颗粒化和污染物去除的影响。在第二阶段（90 ~ 120 d）， Fe2+形成了成熟的颗粒，与第一阶段（0 ~ 90 d）相比，COD、PO₄3−p和TN的去除率分别提高到88.1%、96.4%和97.2%。Fe2+可使胞外聚合物（EPS）的PN/PS比提高33.0% ~ 92.5%，调节EPS分布，促进微生物聚集。实验结束时，对反硝化菌（Unclassified_Rhodobacteraceae, Denitromonas）和聚磷菌（Pseudomonas）等功能异养菌进行了富集。它们与微藻的共生关系确保了有效的污染物去除和加速造粒。因此，在海水养殖废水处理系统中添加Fe2+为提高纯微藻造粒和去除污染物提供了一种实用的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Feasibility of ferrous iron addition to promote the pure Chlorella sp. granulation for mariculture wastewater treatment

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Feasibility of ferrous iron addition to promote the pure Chlorella sp. granulation for mariculture wastewater treatment

The slow granulation of pure Chlorella sp. limits its application in mariculture wastewater treatment, necessitating strategies to enhance granulation and pollutant removal efficiency. This study investigated the effect of 10 mg/L Fe²⁺ on Chlorella sp. granulation and pollutant removal over 120 days. During stage II (90–120 days) with Fe²⁺ addition, mature granules formed, and removal efficiencies for COD, PO₄³⁻-P, and TN improved to 88.1 %, 96.4 %, and 97.2 %, respectively, compared to stage I (0–90 days). Fe²⁺ increased the PN/PS ratio in extracellular polymeric substances (EPS) by 33.0–92.5 %, regulated EPS distribution, and promoted microbial aggregation. Functional heterotrophic bacteria, including denitrifying (Unclassified_Rhodobacteraceae, Denitromonas) and phosphorus-accumulating (Pseudomonas) microorganisms, were enriched by the end of the experiment. Their symbiotic relationship with microalgae ensured efficient pollutant removal and accelerated granulation. Thus, Fe²⁺ addition offers a practical approach to enhance pure microalgae granulation and pollutant removal in mariculture wastewater treatment systems.

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