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Dr. Amir M. Motlagh
Department of Civil Engineering, California State University, Sacramento, CA, USA

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0 Bioinformatics
0 Environmental Microbiology
0 Nutrient Recovery
0 solid waste management
0 sustainable processes

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Annual literature review
Published: 23 July 2020 in Water Environment Research
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Groundwater is a vital component of water supply for residential, industrial, and agricultural purposes. However, many groundwater basins are being used unsustainably and groundwater contamination is a growing water quality problem. Although anthropogenic activities and natural processes have been increasing the contamination in this valuable water resource, several remediation techniques have been developed in the last few decades to reduce these contamination levels. This review paper focuses on the recent studies developed on groundwater pollutions, remediation practices, and groundwater quality management.

ACS Style

Amir Mohaghegh Motlagh; Zhengjian Yang; Humayra Saba. Groundwater quality. Water Environment Research 2020, 92, 1649 -1658.

AMA Style

Amir Mohaghegh Motlagh, Zhengjian Yang, Humayra Saba. Groundwater quality. Water Environment Research. 2020; 92 (10):1649-1658.

Chicago/Turabian Style

Amir Mohaghegh Motlagh; Zhengjian Yang; Humayra Saba. 2020. "Groundwater quality." Water Environment Research 92, no. 10: 1649-1658.

Annual literature review
Published: 10 September 2019 in Water Environment Research
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This review paper focuses on detection and quantification methods of indicator organisms that can be used for water quality assessment. The environmental pathogens that are critical to understand and better evaluate water quality are also discussed in this paper. Several recent studies using indicator organisms to assess various environmental samples have been reviewed.

ACS Style

Amir Mohaghegh Motlagh; Zhengjian Yang. Detection and occurrence of indicator organisms and pathogens. Water Environment Research 2019, 91, 1402 -1408.

AMA Style

Amir Mohaghegh Motlagh, Zhengjian Yang. Detection and occurrence of indicator organisms and pathogens. Water Environment Research. 2019; 91 (10):1402-1408.

Chicago/Turabian Style

Amir Mohaghegh Motlagh; Zhengjian Yang. 2019. "Detection and occurrence of indicator organisms and pathogens." Water Environment Research 91, no. 10: 1402-1408.

Journal article
Published: 28 May 2019 in Waste Management
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Leachate organic matter (LOM) from mature, stabilized landfills is recalcitrant in nature resulting from high concentrations of humic substances, such as humic acids and other complex organic matter. This research focused on the behavior and fate of LOM in aquatic sun-lit systems to address the extent and mechanisms of LOM photodegradation by exposing leachate to natural sunlight in central Florida for a period of 90 days. Transformation processes were measured using ultraviolet–visible (UV–Vis) spectroscopy, fluorescence excitation-emission matrix spectroscopy, size-exclusion chromatography, and chemical oxygen demand over the test period. Results of the study suggest that photolytic, and in some cases biological, reactions were responsible for the reduction of LOM demonstrated by the transformation of high molecular weight recalcitrant material to lower molecular weight material, loss of fluorescence and color, and reduction of UV254 absorbance.

ACS Style

Duncan Lozinski; Stephanie C. Bolyard; Debra R. Reinhart; Amir Mohaghegh Motlagh. Treatment of leachate organic matter through sunlight driven processes. Waste Management 2019, 94, 18 -26.

AMA Style

Duncan Lozinski, Stephanie C. Bolyard, Debra R. Reinhart, Amir Mohaghegh Motlagh. Treatment of leachate organic matter through sunlight driven processes. Waste Management. 2019; 94 ():18-26.

Chicago/Turabian Style

Duncan Lozinski; Stephanie C. Bolyard; Debra R. Reinhart; Amir Mohaghegh Motlagh. 2019. "Treatment of leachate organic matter through sunlight driven processes." Waste Management 94, no. : 18-26.

Journal article
Published: 27 March 2019 in Waste Management
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There are growing concerns over the negative effects of leachate organic matter (LOM) on ultraviolet (UV) disinfection and effluent quality when leachate is co-treated with domestic wastewater. In this study, the effects of LOM on wastewater effluent quality were evaluated through field studies at wastewater treatment plants (WWTPs) that receive and do not receive leachate. Impacts of leachate on effluent quality were determined through UV measurements at 254 nm (UV254), fluorescence measurements, and the quantification of conventional parameters which included nutrient and organic constituent concentrations. Results showed that some leachate impacts can be observed using UV254 spectroscopy in wastewater influent and effluent when present at volumetric contributions as low as 0.01%. In addition, leachate impacted wastewater samples showed a higher dissolved organic nitrogen and dissolved organic carbon concentrations in the effluent relative to effluents from WWTPs without leachate. At leachate volumetric contributions greater than or equal to 0.1% (0.10–14.8%), UV254 transmittance in wastewater effluents was below 65%. A typical guideline for effective UV disinfection at WWTPs is above 65% transmittance. Furthermore, fluorescence characterization of leachate-impacted wastewater showed a higher intensity of humic-like peaks relative to wastewater without leachate. This research provided a better understanding of the potential implications of accepting leachate at WWTPs. These effects, however, can be managed by ensuring that leachate discharge is maintained at acceptable volumetric contributions and evenly spread out over the discharge period.

ACS Style

Stephanie C. Bolyard; Amir Mohaghegh Motlagh; Duncan Lozinski; Debra R. Reinhart. Impact of organic matter from leachate discharged to wastewater treatment plants on effluent quality and UV disinfection. Waste Management 2019, 88, 257 -267.

AMA Style

Stephanie C. Bolyard, Amir Mohaghegh Motlagh, Duncan Lozinski, Debra R. Reinhart. Impact of organic matter from leachate discharged to wastewater treatment plants on effluent quality and UV disinfection. Waste Management. 2019; 88 ():257-267.

Chicago/Turabian Style

Stephanie C. Bolyard; Amir Mohaghegh Motlagh; Duncan Lozinski; Debra R. Reinhart. 2019. "Impact of organic matter from leachate discharged to wastewater treatment plants on effluent quality and UV disinfection." Waste Management 88, no. : 257-267.