Investigation on the improved electrochemical and bio-electrochemical treatment processes of soilless cultivation drainage (SCD)

Bryszewski, Kamil; Rodziewicz, Joanna; Mielcarek, Artur; Janczukowicz, Wojciech; Jóźwiakowski, Krzysztof

doi:10.1016/j.scitotenv.2021.146846

Cited by 9 publications

(23 citation statements)

References 54 publications

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“…Autotrophic denitrification uses inorganic carbon (and gaseous hydrogen) as an electron donor. Cathode water electrolysis is a source of hydrogen in the bio-electrochemical reactor [5,10,11]. The use of an electric current also allows for cathode nitrate reduction [12,13].…”

Section: Of 11mentioning

confidence: 99%

“…The authors' earlier research showed that the application of a current with an aluminium electrode and an external carbon source helps to purify hydroponic effluent effectively [5,11,19,20]. Other studies have focused on nitrogen and phosphorus removal from hydroponic effluent.…”

Section: Of 11mentioning

confidence: 99%

“…Kwon et al [21] point out that not enough emphasis is placed on the removal of secondary elements (classified as macro-and micro elements) from effluent. The findings of Bryszewski et al [11] suggest that sludge formed as a result of bio-electrochemical treatment of wastewater from hydroponic tomato cultivation could be applied as a fertilizer.…”

Section: Of 11mentioning

confidence: 99%

“…It was proved that the efficiency of nitrogen and phosphorus removal in BERs with aluminum electrodes depended on the electric current density [3,5,9,20,21]. Analyses of macro-and micro element concentrations in sludge, formed during hydroponic wastewater treatment, were performed sporadically [11]. However, the concentrations of macro-and micro elements in treated wastewater, and the role of electric current density in the elements' removal, were not investigated.…”

Section: Of 11mentioning

confidence: 99%

“…The pH in wastewater after treatment decreased with increasing J, from 8.57 ± 0.72 (R1) to 5.58 ± 0.80 (R4). This results from the production of larger amounts of H + ions at higher electric current densities and a decrease in the heterotrophic denitrification process share, in which nitrate reduction results in the use of acid equivalent (H + ) [11]. The solution pH does not change in bio-electrochemical systems with electrocoagulation.…”

Section: Ph and Electrolytic Conductivitymentioning

confidence: 99%

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Effect of Bio-Electrochemical Treatment of Hydroponic Effluent on the Nutrient Content

2022

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This study examined the effect of bio-electrochemical treatment processes on nitrogen and phosphorus removal, but it also evaluated the impact of the treatment processes on the concentration of other nutrients present in hydroponic effluent. A bio-electrochemical reactor (BER) was used in the experiment to treat effluent from the hydroponic cultivation of tomatoes. It was stated that the nitrogen removal efficiency decreased with increasing current density. The study showed that an electric current density of 0.63 A/m2 ensured the lowest effluent nitrate concentration. The nitrogen removal efficiency ranged from 41.6%-R1 (density of 0.63 A/m2) to 8.9%-R4 (density of 5 A/m2). Electric current density higher than 1.25 A/m2 resulted in lower total nitrogen removal efficiency. The total phosphorus removal efficiency increased with increasing electric current density. The phosphorus removal efficiency was the lowest—95.1%—in the R1 reactor, whereas it was the highest in R4—99.1%. The concentration of the other elements in the effluent was determined. The content of molybdenum, boron, sulphates, and potassium did not meet the acceptable norms for discharging hydroponic effluent into the environment. The study showed that bio-electrochemical processes taking place in BER caused secondary contamination of hydroponic wastewater with molybdenum ions.

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