Disinfection of synthetic human urine by mixed metal oxide anode through photo/electrochemical oxidation

Q1 Environmental Science Environmental Nanotechnology, Monitoring and Management Pub Date : 2024-10-18 DOI:10.1016/j.enmm.2024.101017

Jayishnu Singla , Poulomi Chandra , Palak Bansal , Anoop Verma

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Abstract

This study investigates the electrooxidation treatment of synthetic urine (SU) using quaternary mixed metal oxide (d-MMO) anodes in both batch and continuous modes. We combine photocatalysis (PC) and electrooxidation (EO) to enhance pollutant degradation. The impact of treatment time, pH, Na/Cl ratio, and current density on COD removal and the specific energy consumption is examined. Optimized parameters for batch EO treatment yield a desirability value (D) of 0.941, with COD removal of 90.55 % and energy consumption of 20.851 kWh/kg of COD removed. Treatment time is reduced from 10.05 h to 6.5 h with PEC (Photoelectrocatalysis) incorporation. The stability and durability of anodes are confirmed through XRD and FE-SEM/EDS analysis, even after 500 recycling cycles. This research stands out for utilizing innovative d-MMO anodes for EO and PEC, capturing molecular hydrogen gas during scale-up trials for SU. Through this study, we are proposing for the first time, the novel composition of d-MMO (Ti/IrO₂/Ta₂O₅/SnO₂/Sb₂O₅) for the treatment of SU on a pilot-scale in continuous mode with solar panels, thus making the process cost effective with less energy consumption.

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混合金属氧化物阳极通过光/电化学氧化作用对合成人尿进行消毒

本研究采用四元混合金属氧化物（d-MMO）阳极，以间歇和连续两种模式对合成尿液（SU）进行电氧化处理。我们将光催化（PC）和电氧化（EO）相结合，以提高污染物的降解效果。研究了处理时间、pH 值、Na/Cl 比和电流密度对 COD 去除率和特定能耗的影响。经优化的批量环氧乙烷处理参数的可取值 (D) 为 0.941，COD 去除率为 90.55%，能耗为 20.851 kWh/kg（去除 COD）。加入 PEC（光电催化）后，处理时间从 10.05 小时减少到 6.5 小时。通过 XRD 和 FE-SEM/EDS 分析，即使经过 500 次循环，阳极的稳定性和耐久性也得到了证实。这项研究的突出之处在于利用创新的 d-MMO 阳极进行 EO 和 PEC，在 SU 的放大试验中捕获分子氢气。通过这项研究，我们首次提出了新颖的 d-MMO 成分（Ti/IrO2/Ta2O5/SnO2/Sb2O5），用于在中试规模上与太阳能电池板一起以连续模式处理 SU，从而以较低的能耗使该工艺具有成本效益。

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来源期刊

Environmental Nanotechnology, Monitoring and Management Environmental Science-Water Science and Technology

CiteScore

13.00

自引率

0.00%

发文量

132

审稿时长

48 days

期刊介绍： Environmental Nanotechnology, Monitoring and Management is a journal devoted to the publication of peer reviewed original research on environmental nanotechnologies, monitoring studies and management for water, soil , waste and human health samples. Critical review articles, short communications and scientific policy briefs are also welcome. The journal will include all environmental matrices except air. Nanomaterials were suggested as efficient cost-effective and environmental friendly alternative to existing treatment materials, from the standpoints of both resource conservation and environmental remediation. The journal aims to receive papers in the field of nanotechnology covering; Developments of new nanosorbents for: •Groundwater, drinking water and wastewater treatment •Remediation of contaminated sites •Assessment of novel nanotechnologies including sustainability and life cycle implications Monitoring and Management papers should cover the fields of: •Novel analytical methods applied to environmental and health samples •Fate and transport of pollutants in the environment •Case studies covering environmental monitoring and public health •Water and soil prevention and legislation •Industrial and hazardous waste- legislation, characterisation, management practices, minimization, treatment and disposal •Environmental management and remediation