Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater

Thi Dieu Hien Vo; Xuan Thanh Bui; Bao Trong Dang; Thanh Tin Nguyen; Van Truc Nguyen; Duyen P.H. Tran; Phuong Thao Nguyen; Marisa Boller; Kun Yi Andrew Lin; Sunita Varjani; Pau Loke Show

doi:10.1016/j.eti.2021.101810

Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater

Thi Dieu Hien Vo, Xuan Thanh Bui, Bao Trong Dang, Thanh Tin Nguyen, Van Truc Nguyen, Duyen P.H. Tran, Phuong Thao Nguyen, Marisa Boller, Kun Yi Andrew Lin, Sunita Varjani, Pau Loke Show

Chemical and Petroleum Engineering

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Tannery wastewater contains high pollutants concentrations such as nitrogen, organic matter, salinity, toxic metals, etc. Membrane bioreactor has been widely recognized as potential technology for wastewater treatment and reuse. Finding proper operating conditions and a strategy for fouling mitigation in MBR process is essential to application to tannery wastewater treatment. Herein, this study investigated the effect of organic loading rate (OLR) on the performance and fouling behavior of membrane bioreactor (MBR) treating tannery wastewater during 280 days of operation. The MBR was operated under the low fluxes of 4.2 and 8.3 L m⁻² h⁻¹, corresponding to organic loading rates of 1.3 (OLR1) and 2.6 kg COD m⁻³d⁻¹ (OLR2). The results show that the COD removal was obtained at 78 ± 19% and 89 ± 2% for OLR1 and OLR2, respectively. For the former condition the average removal of total Kjeldahl nitrogen (TKN) and NH₄⁺-N reached 53%–68% and 58%–70%. TKN removal was mainly contributed by cell assimilation. Incomplete nitrification was due to high TDS (11,000–16,790 mg L⁻¹) and the presence of free ammonia (6.77–31.11 mg L⁻¹) concentrations under pH 8.7–8.8. Membrane fouling rate was strongly governed by operated flux. At flux of 4.2 LMH the fouling rate was as low as 0.19–0.4 kPa d⁻¹ while the fouling rate accelerated (1.87–1.93 kPa d⁻¹) as increased two times flux. These findings proposed a low flux of 4.2 LMH for MBR operation in treating real tannery wastewater. It was found that influent total suspended solids (TSS) played a crucial factor in spiking mixed liquor suspended solids (MLSS) into MBR. Thus, a pretreatment process is suggested to remove major suspended solids from raw tannery wastewater prior to biological treatment.

Original language	British English
Article number	101810
Journal	Environmental Technology and Innovation
Volume	24
DOIs	https://doi.org/10.1016/j.eti.2021.101810
State	Published - Nov 2021

Keywords

Low flux
Organic loading rate
Salinity
Salt tolerant bacteria
Tannery wastewater

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.eti.2021.101810

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Vo, T. D. H., Bui, X. T., Dang, B. T., Nguyen, T. T., Nguyen, V. T., Tran, D. P. H., Nguyen, P. T., Boller, M., Lin, K. Y. A., Varjani, S., & Show, P. L. (2021). Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater. Environmental Technology and Innovation, 24, Article 101810. https://doi.org/10.1016/j.eti.2021.101810

@article{621f3aade7074142bc58e553aed9522a,

title = "Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater",

abstract = "Tannery wastewater contains high pollutants concentrations such as nitrogen, organic matter, salinity, toxic metals, etc. Membrane bioreactor has been widely recognized as potential technology for wastewater treatment and reuse. Finding proper operating conditions and a strategy for fouling mitigation in MBR process is essential to application to tannery wastewater treatment. Herein, this study investigated the effect of organic loading rate (OLR) on the performance and fouling behavior of membrane bioreactor (MBR) treating tannery wastewater during 280 days of operation. The MBR was operated under the low fluxes of 4.2 and 8.3 L m−2 h−1, corresponding to organic loading rates of 1.3 (OLR1) and 2.6 kg COD m−3d−1 (OLR2). The results show that the COD removal was obtained at 78 ± 19% and 89 ± 2% for OLR1 and OLR2, respectively. For the former condition the average removal of total Kjeldahl nitrogen (TKN) and NH4+-N reached 53%–68% and 58%–70%. TKN removal was mainly contributed by cell assimilation. Incomplete nitrification was due to high TDS (11,000–16,790 mg L−1) and the presence of free ammonia (6.77–31.11 mg L−1) concentrations under pH 8.7–8.8. Membrane fouling rate was strongly governed by operated flux. At flux of 4.2 LMH the fouling rate was as low as 0.19–0.4 kPa d−1 while the fouling rate accelerated (1.87–1.93 kPa d−1) as increased two times flux. These findings proposed a low flux of 4.2 LMH for MBR operation in treating real tannery wastewater. It was found that influent total suspended solids (TSS) played a crucial factor in spiking mixed liquor suspended solids (MLSS) into MBR. Thus, a pretreatment process is suggested to remove major suspended solids from raw tannery wastewater prior to biological treatment.",

keywords = "Low flux, Organic loading rate, Salinity, Salt tolerant bacteria, Tannery wastewater",

author = "Vo, {Thi Dieu Hien} and Bui, {Xuan Thanh} and Dang, {Bao Trong} and Nguyen, {Thanh Tin} and Nguyen, {Van Truc} and Tran, {Duyen P.H.} and Nguyen, {Phuong Thao} and Marisa Boller and Lin, {Kun Yi Andrew} and Sunita Varjani and Show, {Pau Loke}",

note = "Funding Information: This work was funded by Vietnam National University Ho Chi Minh (VNU-HCM) under grant number B2020-20-03 . The authors would like to thanks for laboratory support and data collection by other students. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = nov,

doi = "10.1016/j.eti.2021.101810",

language = "British English",

volume = "24",

journal = "Environmental Technology and Innovation",

issn = "2352-1864",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater

AU - Vo, Thi Dieu Hien

AU - Bui, Xuan Thanh

AU - Dang, Bao Trong

AU - Nguyen, Thanh Tin

AU - Nguyen, Van Truc

AU - Tran, Duyen P.H.

AU - Nguyen, Phuong Thao

AU - Boller, Marisa

AU - Lin, Kun Yi Andrew

AU - Varjani, Sunita

AU - Show, Pau Loke

N1 - Funding Information: This work was funded by Vietnam National University Ho Chi Minh (VNU-HCM) under grant number B2020-20-03 . The authors would like to thanks for laboratory support and data collection by other students. Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/11

Y1 - 2021/11

N2 - Tannery wastewater contains high pollutants concentrations such as nitrogen, organic matter, salinity, toxic metals, etc. Membrane bioreactor has been widely recognized as potential technology for wastewater treatment and reuse. Finding proper operating conditions and a strategy for fouling mitigation in MBR process is essential to application to tannery wastewater treatment. Herein, this study investigated the effect of organic loading rate (OLR) on the performance and fouling behavior of membrane bioreactor (MBR) treating tannery wastewater during 280 days of operation. The MBR was operated under the low fluxes of 4.2 and 8.3 L m−2 h−1, corresponding to organic loading rates of 1.3 (OLR1) and 2.6 kg COD m−3d−1 (OLR2). The results show that the COD removal was obtained at 78 ± 19% and 89 ± 2% for OLR1 and OLR2, respectively. For the former condition the average removal of total Kjeldahl nitrogen (TKN) and NH4+-N reached 53%–68% and 58%–70%. TKN removal was mainly contributed by cell assimilation. Incomplete nitrification was due to high TDS (11,000–16,790 mg L−1) and the presence of free ammonia (6.77–31.11 mg L−1) concentrations under pH 8.7–8.8. Membrane fouling rate was strongly governed by operated flux. At flux of 4.2 LMH the fouling rate was as low as 0.19–0.4 kPa d−1 while the fouling rate accelerated (1.87–1.93 kPa d−1) as increased two times flux. These findings proposed a low flux of 4.2 LMH for MBR operation in treating real tannery wastewater. It was found that influent total suspended solids (TSS) played a crucial factor in spiking mixed liquor suspended solids (MLSS) into MBR. Thus, a pretreatment process is suggested to remove major suspended solids from raw tannery wastewater prior to biological treatment.

AB - Tannery wastewater contains high pollutants concentrations such as nitrogen, organic matter, salinity, toxic metals, etc. Membrane bioreactor has been widely recognized as potential technology for wastewater treatment and reuse. Finding proper operating conditions and a strategy for fouling mitigation in MBR process is essential to application to tannery wastewater treatment. Herein, this study investigated the effect of organic loading rate (OLR) on the performance and fouling behavior of membrane bioreactor (MBR) treating tannery wastewater during 280 days of operation. The MBR was operated under the low fluxes of 4.2 and 8.3 L m−2 h−1, corresponding to organic loading rates of 1.3 (OLR1) and 2.6 kg COD m−3d−1 (OLR2). The results show that the COD removal was obtained at 78 ± 19% and 89 ± 2% for OLR1 and OLR2, respectively. For the former condition the average removal of total Kjeldahl nitrogen (TKN) and NH4+-N reached 53%–68% and 58%–70%. TKN removal was mainly contributed by cell assimilation. Incomplete nitrification was due to high TDS (11,000–16,790 mg L−1) and the presence of free ammonia (6.77–31.11 mg L−1) concentrations under pH 8.7–8.8. Membrane fouling rate was strongly governed by operated flux. At flux of 4.2 LMH the fouling rate was as low as 0.19–0.4 kPa d−1 while the fouling rate accelerated (1.87–1.93 kPa d−1) as increased two times flux. These findings proposed a low flux of 4.2 LMH for MBR operation in treating real tannery wastewater. It was found that influent total suspended solids (TSS) played a crucial factor in spiking mixed liquor suspended solids (MLSS) into MBR. Thus, a pretreatment process is suggested to remove major suspended solids from raw tannery wastewater prior to biological treatment.

KW - Low flux

KW - Organic loading rate

KW - Salinity

KW - Salt tolerant bacteria

KW - Tannery wastewater

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U2 - 10.1016/j.eti.2021.101810

DO - 10.1016/j.eti.2021.101810

M3 - Article

AN - SCOPUS:85111728275

SN - 2352-1864

VL - 24

JO - Environmental Technology and Innovation

JF - Environmental Technology and Innovation

M1 - 101810

ER -

Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater

Abstract

Keywords

UN SDGs

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