Experimental Study on Anoxic/Oxic Bioreactor and Constructed Wetland for Rural Domestic Wastewater Treatment

Ladu, John Leju Celestino; Lü, Xiwu; Osman, Ahmed M. Shahat

doi:10.19026/rjaset.7.262

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…It is generally accepted that phosphorus uptake is much lower under anoxic condition than under oxic condition because all phosphorus-accumulating bacteria take up the nutrients under aerobic conditions, whereas only a small ratio of them is participated under anoxic condition. The constructed wetland plays the major role for the phosphorus removal and most of the phosphorus removal was achieved in wetland by the media interception, microbial transformation and plant adsorption [13].…”

Section: Phosphorus Removal Resultsmentioning

confidence: 99%

Evaluation of the Multistage Biological-Ecological Process for Removal of Organic Matter and Nutrient from the Rural Domestic Wastewater under Ambient Temperature

Khairalla¹,

Lü²,

Ladu³

2014

AMR

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The rural domestic wastewater system has been evaluated by using a pilot scale of a biological – ecological process which was built and monitored under operation for a long time. The system was operated for six months with an ambient temperature ranged of (5 – 22°C). The process used in this study was set up as a modified anaerobic/anoxic/oxic process followed by a constructed wetland. Stability and acclimatization of the anaerobic bacteria was achieved after 35 days by using glucose and trace nutrient. The system was then continuously operated with a real domestic wastewater. Hydraulic retention time and temperature are more important parameters of the biological-ecological process performance. Therefore, the system was operated with different HRT and temperature to evaluate the performance efficiency. The influent and effluent of the chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) were analyzed. The anaerobic reactor showed that the optimal HRT was 4 days and the reactor demonstrated a removal efficiency rate of COD (55.5%). The average biogas production in the summer season was 6.8 l/d and in the winter was 1.24 l/d. The Biological– ecological process revealed good efficiency in the removal of the COD, total nitrogen and total phosphorous, where the maximum average removal was 85.5%, 79.8%, 74.9% respectively.

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Section: Phosphorus Removal Resultsmentioning

confidence: 99%

Evaluation of the Multistage Biological-Ecological Process for Removal of Organic Matter and Nutrient from the Rural Domestic Wastewater under Ambient Temperature

Khairalla¹,

Lü²,

Ladu³

2014

AMR

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“…It's of great significance to explore a process, which has low energy consumption, high efficiency and utilization and simple in operation and maintenance. Rural domestic sewage treatment is vital to avert water pollution, which has drawn great attention for both researchers and government officials [1] . In recent days, domestic wastewater has been widely studied by many researchers using different treatment processes, either by application of anaerobic filter [2] , upflow anaerobic sludge blanket (UASB) reactor [3,4,5] , high-rate aerobic systems, such as rotating biological contactor [6] , aerobic filter [7] , or by application of low-rate systems, such as slow sand filter [8] , and vertical flow constructed wetlands [9] .…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on a Combined Process of Anaerobic Filter, Anoxic, Oxic and Constructed Wetland for Rural Domestic Sewage Treatment

Ladu¹,

Lü²

2014

AMR

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<div> <p>The right combination and sequence of treatment methods is the key to the successful handling of rural domestic sewage. This research aim was to carry out experimental study on the combined process and assess its efficiency, feasibility, robustness and suitability for rural domestic sewage treatment and explore the best treatment effect and operating parameters. The parameter optimized and controlled includes hydraulic retention time (HRT) and temperature during the entire research operations. The average COD, TN, NH4+-N and TP removal efficiency of the combined process was 78.2%, 70%, 76% and 87% respectively. Overall, the combined process proved to be efficient and suitable for rural domestic sewage treatment.</p> </div>

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Differential Sensitivity of Wetland-Derived Nitrogen Cycling Microorganisms to Copper Nanoparticles

Reyes

Gedalanga

Merino

et al. 2018

ACS Sustainable Chem. Eng.

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Metallic nanoparticles (NPs), the most abundant nanomaterials in consumer and industrial products, are the most probable class to enter and potentially affect the environment. In this study, wetland-derived microcosms were incubated with copper nanoparticles (Cu-NP) and ionic CuCl 2 to investigate acute (10 days) and chronic (100 days) exposures to nitrogen cycling microorganisms. Gene abundance and expression changes were monitored using the GeoChip 5.0 high throughput functional gene microarray and metatranscriptomic sequencing (RNA-seq), respectively. After 10 days, the Cu-NP impacted microbial communities experienced structural shifts within microorganisms associated with dissimilatory nitrogen reduction accompanied by lower nitrate removal as compared to the unexposed controls. By day 100, these differences were largely resolved and nitrate removal was similar to the unexposed control. Furthermore, the Cu-NP exposed microcosms tolerated copper and were more resilient and adaptive than the unexposed controls based on the abundance of copper oxidase (cueO), copper efflux (cusC), and bacterial adaptive response (opuE, soxS, desR, baeS) genes. These findings suggest that sudden influxes of Cu-NPs into wetland systems may impair nitrogen removal initially, but long-term microbial shifts and functional redundancy would promote the net flux of total nitrogen out of the wetlands.

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Experimental Study on Anoxic/Oxic Bioreactor and Constructed Wetland for Rural Domestic Wastewater Treatment

Cited by 3 publications

References 21 publications

Evaluation of the Multistage Biological-Ecological Process for Removal of Organic Matter and Nutrient from the Rural Domestic Wastewater under Ambient Temperature

Evaluation of the Multistage Biological-Ecological Process for Removal of Organic Matter and Nutrient from the Rural Domestic Wastewater under Ambient Temperature

Experimental Study on a Combined Process of Anaerobic Filter, Anoxic, Oxic and Constructed Wetland for Rural Domestic Sewage Treatment

Differential Sensitivity of Wetland-Derived Nitrogen Cycling Microorganisms to Copper Nanoparticles

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