Hydrochar-nanocomposite membrane combined hydrothermal pretreatment for nutrient upcycling from anaerobic digestate

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

Water Research Pub Date : 2025-02-02 DOI:10.1016/j.watres.2025.123212

Runhao Zhang, Chujie Qi, Jiaxin Bai, Li Gao, Stephen Gray, Chenhao Ma, Qiao Zhou, Bo Bian

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Abstract

Efficient resource recovery is crucial for sustaining food production and alleviating stress on ecosystems. This study combines hydrothermal pretreatment with polyvinylidene fluoride (PVDF)-hydrochar nanocomposite membranes for near-complete resource recovery in kitchen waste treatment. The dual-functionalized pretreatment, which combines targeted conversion/enrichment with adsorption/filtration, effectively addresses the limitations of existing membrane separation technologies, including low nutrient recovery selectivity, low flux, and high costs. Within a wide pH range (3–11), the optimized lanthanum-doped hydrochar demonstrated over 99% phosphorus recovery, alongside exceptional nutrient recovery potential (over 289.71 mg P/g). The innovative composite membrane design successfully processed over 1,000 bed volumes of biogas slurry containing high phosphorus levels across three in-situ rejuvenation cycles, achieving nearly a 30-fold increase in membrane utilization compared to pristine PVDF membranes (36 bed volumes). The durability and fouling resistance of the composite membranes were enhanced through a synergistic mechanism that included ligand exchange and retention, as well as improved membrane surface properties. This facilitated the selective and efficient recovery of nutrients (99.33% P and 50.81% N) and enabled a profitable turnaround for anaerobic by-product upcycling ($28.51/ton). This study offers novel solutions to address the phosphorus scarcity crisis and promotes the integration of organic waste management with low carbon value addition.

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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.