Electrochemical recovery of phosphorus from wastewater using tubular stainless-steel cathode for a scalable long-term operation

Lei，Yang1,2,3; Zhan，Zhengshuo1,2,3; Saakes，Michel2; van der Weijden，Renata D.2,3; Buisman，Cees J. N2,3

2021-07-01

10.1016/j.watres.2021.117199

WATER RESEARCH   影响因子和分区

0043-1354

1879-2448

Phosphorus (P) is an irreplaceable element, playing a vital role in living organisms, yet has limited earth reserves. The possibility of P recovery from wastewaters by electrochemically-induced calcium phosphate precipitation (ECaPP) was demonstrated previously. The current study presents a novel scalable prototype consisting of a column-shaped electrochemical reactor, a tubular stainless-steel cathode, and a Pt coated Ti anode. The adhesion of solids to the cathode, important for product recovery, was shown not to be negatively impacted by electrodes’ vertical placement. The influence of current (density), hydraulic retention time (HRT), and initial phosphate concentration in this prototype were examined under continuous flow operation. The system accomplished the highest P removal rate (1267 mg/day) at 1.5 d HRT and 800 mA in treating undiluted cheese wastewater with 48.5 kWh/kg P. Moreover, the prototype showed high stability and efficiency (> 50%) over 173 days of continuous operation without performing maintenance. After turning off the current (0 mA), the system realized a surprising P removal jump up to 97.3%, revealing the delayed diffusion of hydroxide ions by the deposition layer. The calculation of CAPEX and OPEX of ECaPP in treating 100 m cheese wastewater per week indicates that the ECaPP plant can realize net-positive from the 12 year. The recovered solids have relatively high P content (> 9wt%) and insignificant contamination of heavy metals. Overall, the proven suitability of the scalable prototype can pave the way towards the actual adoption of the ECaPP process.

Calcium phosphate Cheese wastewater Continuous flow operation Energy consumption pH Phosphate removal

SCI ; EI

英语

NI期刊

第一 ; 通讯

WOS:000659350200011

20212010363332

Calcium phosphate ; Cathodes ; Heavy metals ; Molecular biology ; pH ; Precipitation (chemical) ; Recovery ; Stainless steel ; Wastewater treatment

Industrial Wastes Treatment and Disposal:452.4 ; Biology:461.9 ; Minerals:482.2 ; Energy Utilization:525.3 ; Metallurgy and Metallography:531 ; Steel:545.3 ; Chemistry, General:801.1 ; Chemical Operations:802.3 ; Inorganic Compounds:804.2

ENVIRONMENT/ECOLOGY

2-s2.0-85105797720

Scopus

1.School of Environmental Science and Engineering,Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
2.Wetsus,Centre of Excellence for Sustainable Water Technology,Leeuwarden,P.O. Box 1113,8900CC,Netherlands
3.Department of Environmental Technology,Wageningen University and Research,Wageningen,P.O. Box 17,6700AA,Netherlands

Lei，Yang,Zhan，Zhengshuo,Saakes，Michel,et al. Electrochemical recovery of phosphorus from wastewater using tubular stainless-steel cathode for a scalable long-term operation[J]. WATER RESEARCH,2021,199.

Lei，Yang,Zhan，Zhengshuo,Saakes，Michel,van der Weijden，Renata D.,&Buisman，Cees J. N.(2021).Electrochemical recovery of phosphorus from wastewater using tubular stainless-steel cathode for a scalable long-term operation.WATER RESEARCH,199.

Lei，Yang,et al."Electrochemical recovery of phosphorus from wastewater using tubular stainless-steel cathode for a scalable long-term operation".WATER RESEARCH 199(2021).