Natural pigments and biogas recovery from cyanobacteria grown in treated wastewater. Fate of organic microcontaminants

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2024-12-18 DOI:10.1016/j.watres.2024.123005

Marta Bellver , Evelyn Ruales , Rubén Díez-Montero , Mónica Escolà Casas , Víctor Matamoros , Ivet Ferrer

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Abstract

Cyanobacterial wastewater-based biorefineries are a sustainable alternative to obtain high-value products with reduced costs. This study aimed to obtain phycobiliproteins and carotenoids, along with biogas from a wastewater-borne cyanobacterium grown in secondary effluent from an urban wastewater treatment plant, namely treated wastewater. For the first time, the presence of contaminants of emerging concern in concentrated pigment extracts was assessed. Tertiary wastewater treatment was conducted in a 3 L photobioreactor inoculated with Synechococcus sp., and operated in semi-continuous regime with a hydraulic retention time of 6 days. The carotenoid content was stable (reaching up to 4 mg g DW^-1) regardless of the wastewater composition, while the phycobiliprotein content (up to 214 mg g DW^-1) varied according to nitrogen availability. In concentrated pigment extracts, only 3 (out of 20) organic microcontaminants were detected. The biochemical methane potential of pigment-extracted biomass (222 NL CH₄ kg VS⁻¹) was still 72 % of raw biomass. In conclusion, a cyanobacteria culture rich in Synechococcus sp. appears as a promising source of bio-based products in a circular economy approach.

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经过处理的废水中生长的蓝藻的天然色素和沼气回收。有机微污染物的命运。

蓝藻废水为基础的生物精炼厂是一个可持续的替代获得高价值的产品与降低成本。本研究旨在从城市污水处理厂的二级出水（即处理过的废水）中生长的废水蓝藻中获得藻胆蛋白和类胡萝卜素，以及生物气。首次对浓缩色素提取物中出现的污染物进行了评估。三级污水处理在3 L光生物反应器中进行，反应器中接种聚藻球菌，在半连续状态下运行，水力停留时间为6 d。无论废水成分如何，类胡萝卜素含量都是稳定的（可达4 mg gww -1），而藻胆蛋白含量则随氮有效性而变化（可达214 mg gww -1）。在浓缩色素提取物中，20种有机微污染物中仅检测到3种。色素提取生物质的生化甲烷势（222 NL CH4 kg−1）仍为原料生物质的72%。总之，在循环经济方法中，富含聚藻球菌的蓝藻培养物似乎是生物基产品的有前途的来源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.