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水蕹菜（L.）可提高沼气废水污染物去除效果，是可再生能源生产的一种优质基质。

Water lettuce ( L.) increases biogas effluent pollutant removal efficacy and proves a positive substrate for renewable energy production.

机构信息

Department of Water Resources, Can Tho University, Can Tho City, Vietnam.

Department of Environmental Sciences, Can Tho University, Can Tho City, Vietnam.

出版信息

PeerJ. 2023 Aug 22;11:e15879. doi: 10.7717/peerj.15879. eCollection 2023.

DOI:10.7717/peerj.15879
PMID:37637175
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10452623/
Abstract

BACKGROUND

Aquatic plants play a crucial role in nature-based wastewater treatment and provide a promising substrate for renewable energy production using anaerobic digestion (AD) technology. This study aimed to examine the contaminant removal from AD effluent by water lettuce (WL) and produce biogas from WL biomass co-digested with pig dung (PD) in a farm-scale biogas digester.

METHODS

The first experiment used styrofoam boxes containing husbandry AD effluent. WLs were initially arranged in 50%, 25%, 12.5%, and 0% surface coverage. Each treatment was conducted in five replicates under natural conditions. In the second experiment, WL biomass was co-digested with PD into an existing anaerobic digester to examine biogas production on a farm scale.

RESULTS

Over 30 days, the treatment efficiency of TSS, BOD5, COD, TKN, and TP in the effluent was 93.75-97.66%, 76.63-82.56%, 76.78-82.89%, 61.75-63.75%, and 89.00-89.57%, respectively. Higher WL coverage increased the pollutant elimination potential. The WL biomass doubled after 12 days for all treatments. In the farm-scale biogas production, the biogas yield varied between 190.6 and 292.9 L kg VS. The methane content reached over 54%.

CONCLUSIONS

WL removed AD effluent nutrients effectively through a phytoremediation system and generated significant biomass for renewable energy production in a farm-scale model.

摘要

背景

水生植物在基于自然的废水处理中起着至关重要的作用，并为利用厌氧消化（AD）技术生产可再生能源提供了有前景的基质。本研究旨在考察水蕹菜（WL）对 AD 出水的污染物去除，并在农场规模沼气消化器中，将 WL 生物量与猪粪（PD）共消化来生产沼气。

方法

第一项实验使用含有畜牧业 AD 出水的泡沫塑料盒。WL 最初以 50%、25%、12.5%和 0%的表面积覆盖率排列。每个处理在自然条件下进行五次重复。在第二项实验中，将 WL 生物质与 PD 共消化到现有的厌氧消化器中，以在农场规模上考察沼气生产。

结果

在 30 天以上的时间里，出水的 TSS、BOD5、COD、TKN 和 TP 的处理效率分别为 93.75-97.66%、76.63-82.56%、76.78-82.89%、61.75-63.75%和 89.00-89.57%。较高的 WL 覆盖率增加了污染物去除的潜力。所有处理的 WL 生物量在 12 天后都增加了一倍。在农场规模的沼气生产中，沼气产量在 190.6 和 292.9 L kg VS 之间变化。甲烷含量超过 54%。

结论

WL 通过植物修复系统有效地去除了 AD 出水中的营养物质，并在农场规模模型中产生了大量的可再生能源生物量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/ac866ce18b6c/peerj-11-15879-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/ac866ce18b6c/peerj-11-15879-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/d94f2c8a8ef8/peerj-11-15879-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/66e93594b14f/peerj-11-15879-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/20339f0211e2/peerj-11-15879-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/1f5b86852ec3/peerj-11-15879-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/9f82371854b2/peerj-11-15879-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/cde3ff797192/peerj-11-15879-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/14fe534ffc4f/peerj-11-15879-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/42396902381c/peerj-11-15879-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/55670610940c/peerj-11-15879-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/bbf0a6f31cd0/peerj-11-15879-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1013/10452623/d65e224f6211/peerj-11-15879-g011.jpg
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