Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

Belmonte, Marisol; Hsieh, Chia-Fang; Campos, José Luis; Guerrero, Lorna; Méndez, R.; Mosquera-Corral, Anuska; Vidal, Gladys

doi:10.1155/2017/6571671

Cited by 8 publications

(1 citation statement)

References 28 publications

(31 reference statements)

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“…Incoming TN concentration is omitted in the graph, as it was consistently 210 ± 1 mg·L ‐1 (with more than 99.3% TAN), for the entire operating period. During the nitrification stage, the nitrite content remained lower than 1 mgN·L ‐1 , so that nitrification inhibition by nitrous acid can be neglected (Belmonte et al, 2017). On the other hand, average effluent concentrations of

{NO}_{3}^{‐} ‐ N

were 44.7, 14.4, 68.2, 43.6, and 16.2 mg·L ‐1 for phases 1–5, respectively.…”

Section: Resultsmentioning

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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{NO}_{3}^{‐} ‐ N

were 44.7, 14.4, 68.2, 43.6, and 16.2 mg·L ‐1 for phases 1–5, respectively.…”

Section: Resultsmentioning

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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ANAMMOX in Wastewater Treatment

Aransiola

Ijah

Abioye

et al. 2021

Environmental and Microbial Biotechnology

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Application of nonwoven microfiltration membrane on activated sludge final effluent: improving wastewater quality for reuse

Kabuba

Masala

Topkin

2023

Int. J. Environ. Sci. Technol.

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The application of membrane technology in wastewater treatment for reuse is one of the alternatives to reduce the demand of water in domestic, agricultural and industrial sectors. This study attempts to improve wastewater quality effluent, prior to disinfection, for re-use. Clarifier effluent from a biological nutrient removal (BNR) treatment plant was diverted to a nonwoven membrane pilot filtration unit. It was thus positioned to further enhance the clarifier effluent as a polishing arrangement. Water Quality Index (WQI), Single Factor Pollution Index (Pi), Water Use License (WUL) and removal efficiency methods were used to interpret the water quality data for BNR clarifier effluent and nonwoven membrane permeate. The results showed that this nonwoven microfilter membrane is able to improve wastewater quality from BNR clarifier effluent. Escherichia coli (E. coli) reduction was the highest with a removal efficiency of 90%, followed by chemical oxygen demand 25%, NH4+ 22%, NO3− 12.6%, PO4 7.8%, suspended solids 6.3%. The lowest reduction was electrical conductivity of 5.2%. Permeate results indicated that physiochemical and microbial parameters were complying with the limits of WUL. Pi has revealed that BNR clarifier effluent water quality is medium polluted versus slightly polluted permeate. WQI results for BNR clarifier effluent showed good water quality and the water can be reused for domestic, irrigation and industrial purposes, while permeate WQI results indicated excellent water quality and the water can be reused for drinking, domestic, irrigation and industrial purposes. Outstanding permeate water quality improvement was observed on E.coli counts improving from 4974.48 to 294.33 counts/L. The standard of E.coli according to the WUL at this wastewater care works is 500 counts/L. Results indicate that nonwoven membrane filtration can improve microbial contamination and decrease the demand of chlorine for disinfection of wastewater final effluent. The nonwoven membrane filtration can decrease the water scarcity gap in South Africa for direct water reclamation by improving effluent wastewater.

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Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

Cited by 8 publications

References 28 publications

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

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

ANAMMOX in Wastewater Treatment

Application of nonwoven microfiltration membrane on activated sludge final effluent: improving wastewater quality for reuse

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