Activated sludge denitrification in marine recirculating aquaculture system effluent using external and internal carbon sources

Letelier-Gordo, Carlos Octavio; Huang, Xiaoyu; Aalto, Sanni L.; Pedersen, Palle

doi:10.1016/j.aquaeng.2020.102096

Cited by 17 publications

(2 citation statements)

References 28 publications

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“…Giá trị COD trong nước thải nuôi tôm và nước thải nuôi cá sau các thời gian lưu khác nhau (3,5,9,11,12 Khả năng loại bỏ chất hữu cơ của các loài thực vật thủy sinh như rong đuôi chồn, cói và dệu đã được công bố ở một số nghiên cứu trước đây. Nghiên cứu của Abbasi và cộng sự (2019) cho thấy cây dệu có khả năng loại bỏ chất hữu cơ hiệu quả (sau 10 ngày thí nghiệm, giá trị COD giảm 80% trong mẫu nước thải sinh hoạt (COD đầu vào: 600 mg/L) [6].…”

Section: Hiệu Quả Xử Lý Chất Hữu Cơ (Cod)unclassified

Study on Aquaculture Wastewater Treatment by Aquatic Plants

Phuong,

Hung,

Kha

et al. 2023

EES

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The aquaculture sector is fast developed in Vietnam, whereas untreated water pollution remains an issue. This study used three aquatic plant species, namely Ceratophyllum demersum, Alternanthera paronychioides, and Cyperus corymbosus to treat aquaculture wastewater in Quang Ninh. In the experiment with shrimp farming wastewater, after 16 days of experiment, the results showed C. demersum had the highest ability to remove organic matter (COD) up to 95.2% and the removal efficiency of NH4+-N reached 96.3%, whereas the removal efficiency of organic matter (COD) and NH4+-N of A. paronychioides were 90.5% and 97%, respectively; the removal efficiency of organic matter (COD) and NH4+-N of C. corymbosus were 66.7% and 81.8%, respectively. In the experiment with fish farming wastewater, C. corymbosus had the highest ability to remove organic matter (COD) up to 96% and the removal efficiency of NH4+-N reached 100%, the removal efficiency of organic matter (COD) and NH4+-N of A. paronychioides were 91.8% and 86%, respectively; the removal efficiency of organic matter (COD) and NH4+-N of C. demersum were 83.7% and 76.4%, respectively; whereas in the control sample, the removal efficiency of organic matter (COD) and NH4+-N were only 34.7% and 56%, respectively. In the experiment with shrimp farming wastewater, NO3--N treatment efficiency in the C. corymbosus, C. demersum and A. paronychioides system was 76.1%, 78.7% and 82%, respectively after 3 days of experiment, however NO3--N concentration gradually increased until the 16th day. In the experiment with fish farming wastewater, NO3--N concentration gradually increased during 16 experimental days in systems using three aquatic plants (NO3--N < 3 mg/L at the end of the experiment). The results prove the ability to treat organic matter and ammonium of C. demersum, A. paronychioides and C. corymbosus, however, further studies need to be conducted to limit the increase of NO3--N concentration in aquaculture wastewater treatment. Keywords: wastewater, aquaculture, aquatic plants.

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Section: Hiệu Quả Xử Lý Chất Hữu Cơ (Cod)unclassified

Study on Aquaculture Wastewater Treatment by Aquatic Plants

Phuong,

Hung,

Kha

et al. 2023

EES

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“…When organic matter is limited by the wastewater characteristics, it is necessary to add an external carbon source (Xu et al, 2015). Some of the common choices are glucose (Wang, Li, Huang, He, & Zhang, 2019), dextrose (Kundu, Debsarkar, & Mukherjee, 2016), acetate (Hu et al, 2019; Jena, Kumar, Saifuddin, Dixit, & Das, 2016; Krishna Mohan, Nancharaiah, Venugopalan, & Satya Sai, 2016; Xu et al, 2016), methanol (Xu et al, 2016), and ethanol (Letelier‐Gordo, Huang, Aalto, & Pedersen, 2020; Lu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Treatment of a slaughterhouse wastewater by anoxic–aerobic biological reactors followed by UV‐C disinfection and microalgae bioremediation

Svierzoski

Matheus

Bassin

et al. 2020

Water Environment Research

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In this study, removal of organic matter and nitrogen from a cattle slaughterhouse wastewater was investigated in a two‐stage anoxic–aerobic biological system, followed by UV‐C disinfection. Ecotoxicity of the raw, biotreated, and disinfected wastewater against the microalgae Scenedesmus sp. was evaluated in short‐term tests, while the potential of the microalgae as a nutrient removal step was addressed in long‐term experiments. Throughout 5 operational phases, the biological system was subjected to gradual reduction of the hydraulic retention time (8–1.5 day), increasing the organic (0.21–1.11 kgCOD·m−3·day−1) and nitrogen (0.05–0.28 kgN·m−3· day−1) loading rates. COD and total ammoniacal nitrogen (TAN) removal ranged within 83%–97% and 83%–99%, respectively. While providing alkalinity source, effluent TAN concentrations were below 5 mg·L‐1. Nitrate was the main nitrification product, while nitrite levels remained low (<1 mgN·L‐1). Upon supplementation of external COD as ethanol, total nitrogen removal reached up to 90% at the highest load (0.28 kgN·m−3·day−1). After UV‐C treatment, 3‐log reduction of total coliforms was attained. The 96‐hr ecotoxicity tests showed that all non‐diluted samples tested (raw, biologically treated and UV‐C irradiated wastewater) were toxic to microalgae. Nevertheless, these organisms were able to acclimate and grow under the imposed conditions, allowing to achieve nitrogen and phosphorous removal up to 99.1% and 43.0%, respectively. Practitioner points The treatment of a slaughterhouse wastewater in an anoxic–aerobic biological system followed by a UV‐C disinfection step was assessed. The pre‐denitrification system showed efficient simultaneous removal of organic matter and nitrogen from the wastewater under increasing applied loads. UV‐C disinfection worked effectively in reducing coliforms from the biotreated effluent, boosting the performance of microalgae on nutrients removal. Despite the toxicity to microalgae, they were capable to acclimate to the aqueous matrices tested, reducing efficiently the nutrients content. The combined stages of treatment presented great capacity for depleting up to 97% COD, 99% nitrogen, and 43% phosphorous.

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