Abstract
Due to the high nitrogen and phosphorus concentrations in wastewater from soilless cultivation of tomatoes, the sludge formed during wastewater treatment can be used as a source of nutrients in agriculture. The effect of electrical direct current (DC) density (J) and hydraulic retention time (HRT) in a rotating electrobiological contactor (REBDC) on the quantity and quality of sludge generated in the process of tomato soilless cultivation wastewater treatment was determined. The cathode consisted of discs immobilized with biomass, while the anode was an aluminum electrode. HRTs of 4 h, 8 h, 12 h, 24 h and (J) of 0.63, 1.25, 2.50, 5.00, and 10.00 A/m2 were applied. The study showed that the increase in (J) caused an increase in the amount of sludge generated. The increase of (J) contributed to increased concentrations of biogenes in the sludge, whereas extension of HRT at a given current density contributed to increased concentrations of nitrogen and phosphorus (up to 6.2% and 0.8% respectively) and to the reduced content of organic matter (up to 23.04%). The examined sludge was stabilized, sanitary, and safe, and may be an alternative to mineral fertilizers. This study showed that larger sludge amounts are produced in a DC mode aerobic REBDC than in an alternating current anaerobic one.
Funder
Minister of Education and Science
University of Warmia and Mazury in Olsztyn, Poland
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference51 articles.
1. Soilless culture system to support water use efficiency and product quality: A review;Putra;Agric. Agric. Sci. Procedia,2015
2. Mielcarek, A., Rodziewicz, J., Janczukowicz, W., and Dobrowolski, A. (2019). Analysis of wastewater generated in greenhouse soilless tomato cultivation in central Europe. Water, 11.
3. Removal of nutrients from hydroponic greenhouse effluent by alkali precipitation and algae cultivation method;Saxena;J. Chem. Technol. Biotechnol.,2013
4. Daneshgar, S., Callegari, A., Capodaglio, A.G., and Vaccari, D. (2018). The potential phosphorus crisis: Resource conservation and possible escape technologies: A review. Resources, 7.
5. Minimization of hazardous sludge production using a bioelectrochemical system supplied by an alternating current electric field;Moghiseh;Bioelectrochemistry,2020
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献