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E2.01 Wang 2019 ReNUWIt Annual Meeting Poster

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Abstract/Contents

Abstract
Conventional processes for biological removal of the nitrogen are energy-intensive and produce significant biosolids. Short-cut nitrogen removal processes address this issue by limiting ammonia oxidation to nitrite, decreasing oxygen and electron donor demands and decreasing biomass production. In the CANDO system, electron donor demand is further reduced as is biomass production by limiting the reduction of nitrite to N2O rather than N2. Energy recovery is also possible by using stripped N2O as a co-oxidant for biogas methane. To produce N2O, reducing power stored within polyhydroxyalkanoate (PHA) granules is used to reduce nitrite. In this work, we identified glycogen as an important source of stored reducing power for PHA synthesis, and we evaluated how its consumption affects the efficiency of carbon utilization and N2O yield. By studying two lab-scale reactors, we found that the duration of both the anaerobic and anoxic phases is critical to the N2O yield. Improved process control was achieved by simultaneous monitoring of PHA and glycogen so as to enable nitrite addition at peak PHA concentrations, minimizing glycogen fermentation, improving carbon use efficiency and increasing nitrous yield. Use of a real-time PHA and glycogen monitoring system enabled shortening of the cycle duration from 24 to 12 hours, an increase in N2O yield from 43% to 87%, and a sustained volumetric nitrogen loading rate of 0.25 kgN/m3-d. The length of anaerobic phase also affected the microbial community structure: a short anaerobic phase selected for Defluviicoccus, a glycogen-accumulating organism (GAO); a long anaerobic phase favored a dynamic community with diverse denitrifying bacteria.

Description

Type of resource other
Date created May 2019

Creators/Contributors

Author Wang, Zhiyue
Author Criddle, Craig

Subjects

Subject Re-inventing the Nation’s Urban Water Infrastructure
Subject ReNUWIt
Subject E2.01
Subject Efficient Engineered Systems
Subject Energy and resource recovery
Subject Delta Diablo Sanitation District
Subject California
Subject ammonium
Subject anaerobic digestion
Subject anammox
Subject autotrophic nitrogen removal
Subject bacteria
Subject biosolids
Subject catalyst
Subject consumption
Subject degradation
Subject denitrification
Subject energy
Subject inhibition
Subject innovation
Subject membrane bioreactors
Subject microbial fuel cell
Subject phosphorus removal
Subject removal
Subject sewage sludge
Subject sewage treatment
Subject simultaneous nitrification
Subject supercritical water
Subject wastewater

Bibliographic information

Related Publication Myung, J., Wang, Z. Y., Yuan, T., Zhang, P., Van Nostrand, J. D., Zhou, J. Z., & Criddle, C. S. (2015). Production of Nitrous Oxide from Nitrite in Stable Type II Methanotrophic Enrichments. Environmental Science & Technology, 49(18), 10969-10975. http://doi.org/10.1021/acs.est.5b03385
Related Publication Scherson, Y. D., & Criddle, C. S. (2014). Recovery of Freshwater from Wastewater: Upgrading Process Configurations To Maximize Energy Recovery and Minimize Residuals. Environmental Science & Technology, 48(15), 8420-8432. http://doi.org/10.1021/es501701s
Related Publication Scherson, Y. D., Wells, G. F., Woo, S. G., Lee, J., Park, J., Cantwell, B. J., & Criddle, C. S. (2013). Nitrogen removal with energy recovery through N2O decomposition. Energy & Environmental Science, 6(1), 241-248. http://doi.org/10.1039/c2ee22487a
Related Publication Scherson, Y. D., Woo, S. G., & Criddle, C. S. (2014). Production of Nitrous Oxide From Anaerobic Digester Centrate and Its Use as a Co-oxidant of Biogas to Enhance Energy Recovery. Environmental Science & Technology, 48(10), 5612-5619. http://doi.org/10.1021/es501009j
Location https://purl.stanford.edu/ky305hk4862

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Preferred citation

Wang, Zhiyue and Criddle, Craig. (2019). E2.01 Wang 2019 ReNUWIt Annual Meeting Poster. Stanford Digital Repository. Available at: https://purl.stanford.edu/ky305hk4862

Collection

Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt)

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Contact information

criddle@stanford.edu

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