Abstract
In order to explore the influence of electrode spacing on the performance of the enhanced bioretention system, four bioretention cells with microbial fuel cell (BRC–MFC) systems with different electrode spacing were designed, and the effect of electrode spacing on system performance was revealed by analysing its water treatment capacity and electricity production efficiency. The results showed that BRC–MFC had good water treatment capacity and could produce electricity simultaneously. Compared with other BRC–MFC systems with spacing, the BRC3 system (with an electrode spacing of 30 cm) had significant water treatment capacity under different organic loads, especially under high organic load (C/N = 10) operation, COD removal rate was as high as 98.49%, removal rate was as high as 97%, and it had a higher output voltage of 170.46 ± 6.17 mV. It could be seen that proper electrode spacing can effectively improve the water treatment capacity of the BRC–MFC system. This study provided a feasible method for improving the performance of the BRC–MFC system, and revealed the relevant mechanism. A proper electrode spacing with sufficient carbon sources could effectively improve the water treatment capacity of the BRC–MFC system.
Highlights
Regarding water pollution, the world is facing two important challenges: one is compound pollutant pollution, and the other is energy shortage [1,2]
In order to study the influence of influent organic load on the water quality treatment performance of different electrode spacing systems, the carbon source amount was increased after every 28 d of operation of the system, and the average influent COD concentration was 139.88 ± 5.99 mg l−1 (C/N = 2), 249.88 ± 34.27 mg l−1 (C/N = 4), 493.63 ± 6.20 mg l−1 (C/N = 8), 793 ± 4.87 mg l−1 (C/N = 10), respectively
The COD change trend in the bioretention cells with microbial fuel cell (BRC–microbial fuel cells (MFCs)) system with different electrode spacing was shown in figure 2
Summary
The world is facing two important challenges: one is compound pollutant pollution, and the other is energy shortage [1,2]. In order to solve these two problems at the same time, a sustainable wastewater treatment technology has gradually become a research hotspot. Traditional wastewater treatment plants rely on the combined effects of physics, chemistry and 2 biology. This process requires mechanical equipment and a large amount of energy input to achieve the removal of pollutants. Bioretention cells (BRCs) are similar to constructed wetlands, which is a kind of ecological treatment system, using physical, chemical and biological effects to achieve removal effect, imitating the natural environment, and have good wastewater treatment effects without the need for energy input. Due to its small size, simple structure, good treatment effect, low cost and strong sustainability, it has become a potential wastewater treatment technology [7]. The research on BRC has mainly focused on the operation efficiency of facilities and the optimization of design parameters (such as matrix type, gradation, hydraulic load, height of submerged layer, etc.) [8,9,10]
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