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1

Optimizing the MBBR System and Integrating Nanoparticles to Improve Wastewater Treatment Efficiency

Eid Ahmed, El-Sayed Abd-Elaziz, Ayoub Mohamed, El-Morsy Ahmed

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 2

218--229

EN

Wastewater treatment faces a growing challenge in removing nutrients and organic matter. This study aimed to evaluate the effectiveness of the moving bed biofilm reactor (MBBR) system in removing nutrients and organic from municipal wastewater. The impact of different carrier filling ratios and hydraulic retention times (HRT) on the removal efficiency was systematically investigated. Moreover, the addition of nanoparticle additives to enhance system performance was evaluated. The optimal conditions for the MBBR system were 30–45% filling ratios and a 10-hour HRT, resulting in maximum removal efficiencies for biological oxygen demand (BOD5), chemical oxygen demand (COD) and ammonia (NH4+-N) with a percentage of 85.23%, 81.69%, and 54.45% respectively. Furthermore, adding nanoparticles improved the BOD5 and COD removal efficiencies by 6.6% and 8.0% respectively, compared to the MBBR system without nanoparticles.

2

Combination of Biological Treatment and Ceramic Membrane Filtration – Performance and Maintenance of the Pilot-Scale Installation

Dzihora Yuliia, Stolyarenko Hennadiy

Journal of Ecological Engineering

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2022

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Vol. 23, nr 8

21--29

EN

Membrane separation technologies equipped with ceramic membranes have shown good operational results, high robustness and reliability. In this study, a combination of Moving Bed Biofilm Reactor (MBBR) & Membrane Bioreactor (MBR) (pilot scale) was investigated for fouling control optimisation. The system was operated with flat-sheet microfiltration (MF) ceramic membranes. Because of the attached biofilm in the MBBR, it could work stably and effectively with different loading rates, which reduces the load on the membrane surface. Influences of sludge recirculation and flux on the transmembrane pressure (TMP) value and thus impact on fouling development were investigated. Intensive aeration, backwash as well as the implementation of NaOCl were used as physical and chemical cleaning, respectively. The chemical cleaning efficiency reaches up to 70% and could be increased after further research. After the determination of optimal operational conditions, the normalised permeability value (PN) was effectively maintained with a slight TMP increase.

3

Development of Malaysian Wastewater Polishing Index: Case Study on a Moving Bed Biofilm Reactor

Kawan Jamal Ali, Suja Fatihah, Hasan Hassimi Abu, Jaafar Othman, Rahman Rakmi Abd

Journal of Ecological Engineering

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2020

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Vol. 21, nr 5

1--8

EN

Currently, extra treatment of secondary effluent to remove nitrogen and phosphorous may be required for its unrestricted reuse. This can be achieved by installing the wastewater polishing systems (or tertiary treatment). The wastewater polishing solutions are environmentally friendly, cheap and effective. The experiments were conducted on a pilot scale using a Moving Bed Biofilm Reactor (MBBR) with a capacity of 500 L to polish the municipal effluent from organic pollutant, undesirable nutrients and bacteria without the use of disinfectants. The major purpose was to define and apply a model for evaluating polishing of secondary effluent and implement the optimal technology for unrestricted use. Wastewater Polishing Index (WWPI) is a new tool that has been employed for rapidly evaluating of water quality improvement. It can be implemented into any surface water effluent treatment system or for reuse. WWPI can be an important tool designed for decision makers. The total average weight of six parameters (COD, BOD5, SS, Ammonia nitrogen, Total Phosphorus and Escherichia coli) are defined as the index, each one converted to sub-index which is scaled from zero to one hundred. If none of six parameters exist in the effluent WWPI, it is equal to zero, while if the parameters match the Malaysian’s effluent Standard B, It amounts to one hundred. In turn, WWPI is ninety when all six of them are equal to their corresponding Malaysian National Water Quality Standard (IV) for re-use. The index of wastewater polishing was validated and approved for the pilot MBBR study.

4

Effect of selected factors on the removal of organic matter in a model of moving bed biofilm reactor

Śliz Paulina, Bugajski Piotr, Kurek Karolina

Archives of Environmental Protection

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2019

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Vol. 45, no. 3

64--71

EN

The aim of the study was to determine the impact of selected factors on the reduction of organic pollutants, expressed in BOD5 and CODCr, in wastewater treated in a laboratory scale model of moving bed biofi lm reactor (MBBR). The factors included in the experiment: the degree of fi lling the fluidized bed with biomass carriers, hydraulic load, and aeration intensity. The tested model of the bioreactor consisted of five independent chambers with diameter D = 0.14 m and height H = 2.0 m, which were fi lled with biomass carriers at 0%, 20%, 40%, 60%, 70% of their active volume. During the test period, hydraulic loads at the level of Qh1 = 0.073 m3·m-2·h-1 and Qh2 = 0.073 m3·m-2·h-1were applied, which ensured one-day and two-day sewage retention, respectively. The said reactors were subjected to constant aeration at P1 = 3.0 dm3·min-1 and P2 = 5.0 dm3·min-1. The highest efficiency of the reduction of the analysed indicators was demonstrated by reactors filled with carriers in the degree of 40–60%. Based on the statistical analyses (the analyses of the ANOVA variations and the Kruskal-Wallis test) carried out, it was found that the studied factors significantly modified the mutual interaction in the process of reducing BOD5 in treated wastewater of the reactors tested. The significance of the impact of the discussed factors on the values of the studied indicators in treated wastewater depends on mutual interactions between the investigated factors.

PL

Celem badań było określenie wpływu wybranych czynników na zmniejszenie zanieczyszczeń organicznych, wyrażonych wskaźnikami BZT5 i ChZTCr, w ściekach oczyszczanych w modelu reaktora przypływowego ze złożem ruchomym typu MBBR. Czynniki, które uwzględniono w eksperymencie to: stopień wypełnienia złoża nośnikami biomasy, obciążenie hydrauliczne oraz intensywność napowietrzania. Badany model bioreaktora stanowił pięć niezależnych komór o średnicy D = 0,14 m i wysokości H = 2,0 m, które były wypełnione nośnikami biomasy w stopniu: 0%, 20%, 40%, 60%, 70% ich objętości czynnej. W okresie badań zastosowano obciążenia hydrauliczne na poziomie Qh1 = 0,073 m3·m-2·h-1 oraz Qh2 = 0,073 m3·m-2·h-1, co zapewniało odpowiednio jednodobowe oraz dwudobowe zatrzymanie ścieków. Przedmiotowe reaktory poddawane były stałemu napowietrzaniu na poziomie P1 = 3,0 dm,3min-1 oraz P1 = 3,0 dm3min-1 = 5,0 dm3·min-1. Największą skuteczność redukcji analizowanych wskaźników wykazywały reaktory wypełnione kształtkami w stopniu 40–60%. Na podstawie przeprowadzonych analiz statystycznych (analiza wariacji ANOVA oraz test Kruskala-Wallisa) stwierdzono, iż badane czynniki istotnie modyfikowały wzajemne oddziaływanie na siebie w procesie zmniejszania BZT5 w ściekach oczyszczonych badanych. Istotność wpływu omawianych czynników na wartości badanych wskaźników w ściekach oczyszczonych, zależy od wzajemnych interakcji między badanymi czynnikami.

5

Zastosowanie reaktora ze złożem ruchomym do procesu denitryfikacji w ściekach po złożach zraszanych

Kopeć Ł.

Gaz, Woda i Technika Sanitarna

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2015

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Nr 7

282--286

PL

W artykule przedstawiono prototypowe urządzenie do denitryfikacji – reaktor ze złożem ruchomym (ang. Moving Bed Biofilm Reactor – w skrócie MBBR). Urządzenie zastosowano do procesu denitryfikacji wtórnej w ściekach po zraszanych złożach biologicznych typu Bioclere®. Przeprowadzono analizy stężeń azotanów V i stężeń biomasy w czasie rozruchu reaktora i podczas stabilnej pracy. Określono zależność szybkości denitryfikacji od dostępnego węgla organicznego wyrażonego w ChZT i dokonano oceny urządzenia w kontekście zastosowania w inżynierii środowiska.

EN

This paper presents a prototype device for denitrification – moving bed biofilm reactor (in short: MBBR). The reactor was used for post denitrification in wastewater after Bioclere® trickling filters. Nitrate concentration and biomass concentration analyzes were performed at start-up phase and stable operation. It was found relationship between the denitrification rate and the available organic carbon expressed in COD. The device was assessed in the context of the use in environmental engineering.