评估 AGS 在 PHA 合成和提取以及去除营养物质方面的效率：COD 浓度的影响。

IF 8.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Chemosphere Pub Date : 2024-11-01 DOI:10.1016/j.chemosphere.2024.143708

Quan Yuan , Song Chen , Yun Chen , Xinyu Zhang , Yuqing Lou , Xueting Li , Qian Liang , Yanping Zhang , Yingxue Sun

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引用次数: 0

摘要

本研究利用好氧颗粒污泥（AGS）在序批式反应器中合成了可生物降解的天然生物聚合物聚羟基烷酸酯（PHA）。研究了不同 COD 浓度对 PHA 积累和营养物质去除的影响。同时，比较了不同的 PHA 提取预处理方法，包括去除胞外聚合物物质（EPS）的 NaClO 预处理、回收 EPS 的 Na2CO3 预处理，以及减小颗粒尺寸以增加与提取溶剂相互作用表面积的研磨预处理。结果表明，当 COD 浓度从 800 mg/L 增加到 1600 mg/L 时，PHA 产量增加了 2 倍多（从 91.1 mgPHA/gCDW （细胞干重）增加到 233.3 mgPHA/gCDW）。聚羟基丁酸盐（PHB）和聚羟基戊酸盐（PHV）均占总量的一半，而当 COD 浓度升至 1600 mg/L 时，PHB 的比例升至 71%。PHB 的消耗速度是 PHV 的 3 倍。高浓度 COD（1600 毫克/升）对 AGS 的结构稳定性和除磷效率产生了不利影响，但该系统始终表现出强大的脱氮能力，铵和 TN 的去除率超过 90%。随着 COD 浓度的增加，优势菌从黄杆菌转变为 Halomona 和 Hydrogenophaga。在 PHA 提取方面，与 NaClO 和研磨预处理相比，用于 EPS 回收的 Na2CO3 预处理的 PHA 回收率最高，纯度和 EPS 去除效率接近 100%。

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Evaluating AGS efficiency in PHA synthesis and extraction integrated with nutrient removal: The impact of COD concentrations

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Evaluating AGS efficiency in PHA synthesis and extraction integrated with nutrient removal: The impact of COD concentrations

As natural and biodegradable biopolymers, Polyhydroxyalkanoates (PHA) were synthetized by aerobic granules sludge (AGS) in a sequential batch reactor in this study. The effect of different COD concentrations on PHA accumulation and nutrients removal were investigated. At the same time, different pretreatment methods for PHA extraction, including NaClO pretreatment for extracellular polymeric substances (EPS) removal, Na₂CO₃ pretreatment for EPS recovery, and grinding pretreatment to reduce particle size and augment the surface area available for interaction with the extraction solvent, were compared. The results showed that the PHA yield increased more than 2 times (from 91.1 to 233.3 mgPHA/gCDW (cell dry weight)) when COD concentration increased from 800 to 1600 mg/L. Polyhydroxybutyrate (PHB) and polyhydroxyvalerate (PHV) both accounted for half of the total, while PHB fraction rose to 71% when COD concentration went up to 1600 mg/L. The PHB can be consumed 3 times faster than PHV. High COD concentration (1600 mg/L) adversely impacted the structure stability of AGS and the phosphorus removal efficiency, while the system consistently exhibited robust nitrogen removal capabilities, with ammonium and TN removal efficiencies exceeding >90%. The dominant bacteria shifted from Flavobacterium to Halomona and Hydrogenophaga as the COD concentration increased. In terms of PHA extraction, Na₂CO₃ pretreatment, which was used for EPS recovery, had the best PHA recovery with nearly 100% purity and EPS removal efficiency compared with NaClO and grinding pretreatments.

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来源期刊

Chemosphere 环境科学-环境科学

CiteScore

15.80

自引率

8.00%

发文量

4975

审稿时长

3.4 months

期刊介绍： Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.