Patel, Anand

I am a masters student at Cornell University studying environmental engineering and completed my research at the Chesapeake-Elizabeth A/B pilot...

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About Patel, Anand

I am a masters student at Cornell University studying environmental engineering and completed my research at the Chesapeake-Elizabeth A/B pilot wastewater treatment plant. In my free time I enjoy long distance running, hiking, and playing board games!

Patel, Anand

Titles from this speaker

Description: Enhanced Chlorination Strategy to Tackle the Challenge of Stringent THM Limits: A...

Enhanced Chlorination Strategy to Tackle the Challenge of Stringent THM Limits: A Journey from Bench Scale Testing to Full Scale Demonstration

Abstract

City of Vacaville Easterly WWTP is currently facing an unintended consequence resulting from an upgrade in the treatment process from BOD removal to Biological Nutrient Removal (BNR), which has led to the significant generation of THMs without the presence of ammonia. The WWTP is on a time schedule order (TSO) to meet more stringent THM limits in its final effluent set forth by CRWQCB. To address the challenge, a study was conducted to explore alternative methods of chlorination that could effectively and reliably reduce THMs while also ensuring Total coliform compliance. The study included both bench scale dose-response tests and a fullscale demonstration. Through the bench scale testing, various chlorination methods were examined, ultimately identifying that "step dosing" effectively reduced THM levels. The subsequent field demonstration validated the feasibility and reliability of "step dosing" as an alternative approach for minimizing THM concentrations and maintaining Total coliform compliance in full-scale operations.

To address the challenge of stringent THM limits, a study including both bench scale dose-response tests and a full-scale demonstration was conducted at City of Vacaville Easterly WWTP. The bench scale testing identified that 'step dosing' effectively reduced THM levels and the subsequent field demonstration validated the feasibility and reliability of 'step dosing' as an alternative approach for minimizing THM concentrations and maintaining Total coliform compliance in full-scale operations.

SpeakerLeng, June

Presentation time

15:30:00

16:00:00

Session time

15:30:00

17:00:00

SessionAdvancements and Optimization with Chlorine, Peracetic Acid, and Performic Acid Disinfection

Session locationRoom S405 - Level 4

TopicDisinfection and Public Health, Intermediate Level, Municipal Wastewater Treatment Design, Research and Innovation

Author(s)

Leng, June

Author(s)J. Leng 1; A. Patel 1 ; J. Leng 1; L. Panteloglow 2; M. Boele 3; J. Cole 2; M. Falk 4;

Author affiliation(s)HDR 1; HDR 1 ; HDR 1; City of Vacaville Easterly WWTP 2; City of Vacaville Easterly WWTP 3; City of Vacaville Easterly WWTP 2; City of Vacaville Easterly WWTP 4;

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2023

DOI10.2175/193864718825159014

Volume / Issue

Content sourceWEFTEC

Word count22

Description: High Rate Activated Sludge Fermentation as a Carbon Source for Sidestream BioP and...

High Rate Activated Sludge Fermentation as a Carbon Source for Sidestream BioP and Denitrification

Abstract

Biological phosphorous removal (bioP) and denitrification both require soluble carbon and bioP specifically requires volatile fatty acids (VFAs). An external carbon source can be added to the treatment process to achieve bioP and denitrification, however this adds capital cost and increases carbon footprint. Ideally, carbon that is naturally present in raw wastewater can be transformed and redirected for these biological nutrient removal (BNR) processes. High rate activated sludge (HRAS) or A-Stage systems are run at relatively short SRTs to create an intensified process that removes some chemical oxygen demand (COD) through ordinary heterotrophic organisms (OHOs). The primary purpose of A-Stage systems is to capture carbon as WAS. Because HRAS systems are run at short SRTs, the readily biodegradable COD present in the raw influent is largely consumed by OHOs before reaching downstream BNR processes in B-Stage. One solution to this issue is to redirect the A-Stage WAS into a fermenter to produce VFA. The VFA produced by the fermenter can be used as a carbon source for bioP and denitrification in a B-Stage BNR process. Another advantage of this is that the VFA fed into the BNR process is controlled as opposed to being reliant on the A-Stage effluent COD (McCullough, 2020). While primary sludge fermentation has been studied extensively, studies on A-Stage WAS fermentation are relatively scarce. The objective of this study was to determine the factors which most impact a side-stream A-Stage WAS fermenter. Factors primarily taken into consideration include the characteristics of the influent A-Stage WAS, the fermenter SRT, and the fermenter pH.

In order to supplement volatile fatty acids (VFA) for biological nutrient removal (BNR) in a pilot scale adsorption/bio-oxidation (A/B) process, A-Stage waste activated sludge was thickened and fermented; the resulting VFA-rich thickener supernatant was then fed to a downstream BNR step including a side-stream biological phosphorus removal reactor. This study explored the factors that impacted fermenter performance with respect to VFA yield as well as VFA speciation. It was found that fermenter solids retention time (SRT) was the primary driver of fermenter performance, where fermenter SRT positively correlated with fermenter performance for the range of SRTs the reactor ran at.

SpeakerPatel, Anand

Presentation time

11:40:00

11:50:00

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)

Anand Patel

Author(s)A.H. Patel1; K. McCullough1; C. Wilson2; S. Klaus2; K.G. Malin2; C.B. Bott2; A. Gu2;

Author affiliation(s)Civil and Environment Engineering Department, Cornell University, Ithaca, NY1Hampton Roads Sanitation District, Virginia Beach, VA2

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2021

DOI10.2175/193864718825158132

Volume / Issue

Content sourceWEFTEC

Word count15

Base text size -

Patel, Anand

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