Insights into the simultaneous nitrification, denitrification and phosphorus removal process for in situ sludge reduction and potential phosphorus recovery

He, Qiulai; Xie, Zhiyi; Tang, Meiyi; Fu, Zhidong; Ma, Jingwei; Zhang, Wei; Zhang, Huining; Wang, Meng; Hu, Junxian; Xu, Peng

doi:10.1016/j.scitotenv.2021.149569

Cited by 37 publications

(4 citation statements)

References 21 publications

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“…In order to ensure the stability and accuracy of water, the experiments were conducted by artificially preparing simulated domestic wastewater with 510 mg/L CH 3 COONa, 82 mg/L NH 4 Cl, 53 mg/L KH 2 PO 4 , and 16 mg/L K 2 HPO 4 to provide carbon, nitrogen, and phosphorus sources required for microbial life, and added NaHCO 3 to control the pH of the water in 7.5 ~ 8.5. In addition, appropriate amounts of trace elements were added to the synthetic wastewater, including 44 mg/L MgSO 4 , 100 mg/L FeCl 3 •6H 2 O, 0.12 mg/L MnCl 2 •H 2 O, 0.15 mg/L CoCl 2 •6H 2 O, 0.15 mg/L H 3 BO 3 , 0.12 mg/L ZnSO 4 •7H 2 O, 0.06 mg/L Na 2 MoO 4 •2H 2 O, and 0.03 mg/L KI (He et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

Changes in microbial community during hydrolyzed sludge reduction

Liu,

Wu,

et al. 2023

Front. Microbiol.

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In this study, the effects of different enzymes (lysozyme, α-amylase and neutral protease) on sludge hydrolysis efficiency and microbial community in sequencing batch reactor (SBR) were introduced. The results showed that the hydrolysis efficiencies of the three enzymes were 48.5, 22.5 and 31%, respectively, compared with the accumulated sludge discharge of the blank control group. However, it has varying degrees of impact on the effluent quality, and the denitrification and phosphorus removal effect of the system deteriorates. The lysozyme that achieves the optimal sludge hydrolysis effect of 48.5% has the greatest impact on the chemical oxygen demand (COD), total nitrogen (TN), and nitrate nitrogen (NO3−-N) of the effluent. The sludge samples of the control group and the groups supplemented with different enzyme preparations were subjected to high-throughput sequencing. It was found that the number of OTUs (Operational Taxonomic Units) of the samples was lysozyme > α-amylase > blank control > neutral protease. Moreover, the abundance grade curve of the sludge samples supplemented with lysozyme and α-amylase was smoother, and the community richness and diversity were improved by lysozyme and α-amylase. The species diversity of the sludge supplemented with lysozyme and neutral protease was great, and the community succession was obvious. The introduction of enzymes did not change the main microbial communities of the sludge, which were mainly Proteobacteria, Actinobacteria and Bacteroidetes. The effects of three enzyme preparations on sludge reduction and microbial diversity during pilot operation were analyzed, the gap in microbial research was filled, which provided theoretical value for the practical operation of enzymatic sludge reduction.

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Section: Methodsmentioning

confidence: 99%

Changes in microbial community during hydrolyzed sludge reduction

Liu,

Wu,

et al. 2023

Front. Microbiol.

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“…Nutrient fluxes were calculated using Equation (2). Positive values indicate nutrient release from sediment to overlying water, while negative values indicate nutrient sorption by sediment.…”

Section: Data Statistics and Analysismentioning

confidence: 99%

“…In recent years, rapid development in the Pearl River Delta has caused a significant increase in pollution from excessive nitrogen (N) discharge due to fertilizer and fossil fuel use [1]. The discharge of wastewater from various sources-such as industrial emissions, agricultural production, urbanization, and human activities-combined with high water temperatures ranging from 13.9 • C in winter to 31.5 • C in summer has resulted in black-odorous water bodies, unique to southern China [2,3]. The Pearl River Delta region-part of Guangdong Province-records the highest number of black-odorous water bodies in China.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Sediment–Water Ratio and Hydraulic Residence Time on the Release of Inorganic Nitrogen from Sediments in the Pearl River Delta

Gong

Wang

et al. 2023

Water

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Black-odorous water bodies in the Pearl River Delta have been treated. However, the re-release of nitrogen (N)-containing compounds in sediment can cause a relapse of black-odorous water bodies. Sediment–water ratio (SWR) and hydraulic residence time (HRT) influence pollutant release. Therefore, how to control SWR and HRT during the treatment process has become an urgent problem. This study focuses on the dynamic release of endogenous inorganic N from sediments into overlying water in a river channel of Dongguan City, Guangdong Province. Physicochemical parameters (dissolved inorganic nitrogen (DIN), NH4+-N, NO3−-N, NO2−-N, dissolved oxygen (DO), pH, oxidation-reduction potential (ORP), chemical oxygen demand (COD), Fe and total phosphorus (TP)) of overlying water were monitored under different SWRs (0.71, 0.38, and 0.16) and HRTs (13 days and 6.5 days), and the nitrogen release flux under different conditions was compared. Finally, the correlation and influence pathways among environmental factors were analyzed. The results showed that SWR significantly affected DO, pH, ORP, and sediment N release fluxes while prolonging HRT-promoted denitrification. DIN → NO2−-N → DO pathway had a total effect of 19.6%, and DIN may promote low DO concentration via NO2− oxidation. Maintaining reasonable SWR and HRT can reduce the release of inorganic N from sediment into the overlying water. This study provides a theoretical basis for controlling black-odorous water bodies.

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“…To alleviate fouling of ultrafiltration membranes caused by NOM, a variety of pretreatment technologies have been probed in the past several years [21][22][23][24]. Advanced pre-oxidation is considered to be an attractive method among the various pretreatment strategies.…”

Section: Introductionmentioning

confidence: 99%

Alleviation of Ultrafiltration Membrane Fouling by ClO2 Pre-Oxidation: Fouling Mechanism and Interface Characteristics

et al. 2022

Self Cite

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In order to alleviate membrane fouling and improve removal efficiency, a series of pretreatment technologies were applied to the ultrafiltration process. In this study, ClO2 was used as a pre-oxidation strategy for the ultrafiltration (UF) process. Humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA) were used as three typical organic model foulants, and the mixture of the three substances was used as a representation of simulated natural water. The dosages of ClO2 were 0.5, 1, 2, 4, and 8 mg/L, with 90 min pre-oxidation. The results showed that ClO2 pre-oxidation at low doses (1–2 mg/L) could alleviate the membrane flux decline caused by humus, polysaccharides, and simulated natural water, but had a limited alleviating effect on the irreversible resistance of the membrane. The interfacial free energy analysis showed that the interaction force between the membrane and the simulated natural water was also repulsive after the pre-oxidation, indicating that ClO2 pre-oxidation was an effective way to alleviate cake layer fouling by reducing the interaction between the foulant and the membrane. In addition, ClO2 oxidation activated the hidden functional groups in the raw water, resulting in an increase in the fluorescence value of humic analogs, but had a good removal effect on the fluorescence intensity of BSA. Furthermore, the membrane fouling fitting model showed that ClO2, at a low dose (1 mg/L), could change the mechanism of membrane fouling induced by simulated natural water from standard blocking and cake layer blocking to critical blocking. Overall, ClO2 pre-oxidation was an efficient pretreatment strategy for UF membrane fouling alleviation, especially for the fouling control of HA and SA at low dosages.

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Insights into the simultaneous nitrification, denitrification and phosphorus removal process for in situ sludge reduction and potential phosphorus recovery

Cited by 37 publications

References 21 publications

Changes in microbial community during hydrolyzed sludge reduction

Changes in microbial community during hydrolyzed sludge reduction

The Impact of Sediment–Water Ratio and Hydraulic Residence Time on the Release of Inorganic Nitrogen from Sediments in the Pearl River Delta

Alleviation of Ultrafiltration Membrane Fouling by ClO2 Pre-Oxidation: Fouling Mechanism and Interface Characteristics

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