Zhang, Yihan

I am a PhD student in the Department of Civil and Environmental Engineering at the University of California, Davis, working with Dr. Maureen Kinyua. My research focuses on biological nutrients removal as well as public heath related issues in wastewater treatment plants in Northern California. Specifically, I am interested in understanding the kinetics and mechanisms of novel polyphosphate accumulating organisms in EBPR process.

Titles from this speaker

Description: Impacts of Advanced Primary Treatment on Advanced Secondary Treatment and MLE...

Impacts of Advanced Primary Treatment on Advanced Secondary Treatment and MLE Processes

Abstract

The performances of four advanced primary treatment (APT) technologies including Cloth Disk Primary Filter (CDPF), Compressible Medium Biofilter (CMBF), Micro-Screen (MS) and Proteus Filter were evaluated. Compared to primary clarifier which achieved 58% removal for total suspended solids (TSS) and 32% removal for chemical oxygen demand (COD), both CDPF and CMBF demonstrated a significantly higher removal performance. The CDPF achieved 76% removal for total suspended solids (TSS) and 49% removal for COD, while the CMBF achieved 70% removal for TSS and 52% removal for BOD. The performance of the MS was comparable to primary clarifier at a footprint of only 20-30% of primary clarifier. The CDPF and Proteus filter also showed similar significant footprint reduction compared to primary clarifier. To demonstrate the full benefits of advanced wastewater treatment, the impacts of APT on advanced secondary treatment (AST) and conventional MLE process is evaluated as part of the ongoing technology research and demonstration project at Linda Water Resource Recovery Facility

The performances of four advanced primary treatment (APT) technologies including Cloth Disk Primary Filter, Compressible Medium Biofilter, Micro-screen and Proteus Filter were evaluated in this long-term and comprehensive technology development and demonstration project. Compared to primary clarifier, APT technologies demonstrated higher treatment performances also resulting in significant energy savings, secondary treatment capacity increase, and footprint reduction in primary treatment.

SpeakerCaliskaner, Onder

Presentation time

14:30:00

15:00:00

Session time

13:30:00

15:00:00

SessionPrimary Treatment Technologies: Should We Settle for Conventional Primary Sedimentation?

Session locationRoom S501a - Level 5

TopicEnergy Production, Conservation, and Management, Facility Operations and Maintenance, Intermediate Level, Municipal Wastewater Treatment Design

Author(s)

Caliskaner, Onder

Author(s)O. Caliskaner 1; Y. Zhang 2 ; O. Caliskaner 1; Y. Wu 3; E. Martinez 4; G. Tchobanoglous 5; B. Davis 6;

Author affiliation(s)Caliskaner Water Technologies, Inc. 1; Caliskaner Water Technologies, Inc. 2 ; Caliskaner Water Technologies, Inc. 1; Caliskaner Water Technologies, Inc. 3; Caliskaner Water Technologies, Inc. 4; University of California at Davis 5; Linda County Water District 6;

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2023

DOI10.2175/193864718825159004

Volume / Issue

Content sourceWEFTEC

Word count13

$Description: Investigation on the impact of operation and carbon fractionation on unintended...$

Investigation on the impact of operation and carbon fractionation on unintended nitrogen and phosphorus removal in wastewater facilities in the San Francisco Bay

Abstract

In California, the San Francisco (SF) Bay has become one of the most nutrient-enriched estuary in the world due to high nutrient discharges into the watershed (Cloern and Jassby, 2012). Research shows that the SF Bay has been gradually losing its resiliency to nitrogen (N) and phosphorus (P) pollution and may suffer from severe water quality impairment in the near future (Cloern et al., 2020; Novick and Senn, 2014). While wastewater discharges are considered a major contributor of nutrient point-source pollution to the environment (Drolc and Zagorc Koncan, 2002), most municipal wastewater treatment plants (WWTPs) in the SF Bay do not have biological nutrient removal (BNR) processes. In an effort to protect water quality and meet future nutrient discharge limits, 37 WWTPs in the SF Bay have participated in nutrient reduction studies led by the Bay Area Clean Water Agency (BACWA) (Falk et al., 2018). The short-term objective of these studies is to evaluate the current treatment performance and seek opportunities for total nitrogen (TN) reduction via treatment optimization or upgrading. The long-term objective is to incorporate total phosphorus (TP) reduction into the treatment process. Among these 37 WWTPs, several of them have an anaerobic selector in the secondary treatment process. Although the original intent for this design feature was filaments control, some of these facilities have reported unintended N and P removal. This provides an interesting opportunity to evaluate the technical feasibility of optimizing and/or upgrading existing systems to achieve N and P removal. However, to the best of our knowledge, no previous study has examined the carbon fractionation and microbial community compositions in these plants and their influence on nutrients reduction rate. Therefore, the objective of this study is to quantify the impact of operational parameters (e.g., retention times) and influent characteristics (i.e., COD fractions) on N and P reduction capacities in these WWTPs. This may enable us to identify facility specific features that will provide information in the nutrients removal design decision making process. Because this is an ongoing project, only operational and analytical data is presented here. Microbial community characteristics using 16S rRNA gene analysis will be performed to determine the dominant polyphosphate-accumulating organisms (PAOs), ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) communities in these systems.

While most municipal wastewater treatment plants (WWTPs) in California do not have biological nutrients removal (BNR) process, unintended nitrogen (N) and phosphorus (P) removal was observed in several WWTPs in the San Francisco (SF) Bay. Understanding the process kinetic and microbial structure of these natural systems may improve our knowledge of BNR process. This study evaluated the process performance and microbial community structure in these unintended BNR systems.

SpeakerZhang, Yihan

Presentation time

11:00:00

11:10:00

Session time

11:00:00

12:00:00

SessionTo Ferment or Not to Ferment: Experiences with Carbon Management, Addition, and Generation for Nutrient Removal

Session number418

TopicFacility Operations and Maintenance, Municipal Wastewater Treatment Design, Nutrients

Author(s)

Yihan Zhang