Wastewater injection, aquifer biogeochemical reactions, and resultant groundwater N fluxes to coastal waters: Ka'anapali, Maui, Hawaii

MARINE POLLUTION BULLETIN

卷:110

Article

Fackrell, Joseph K.¹  Glenn, Craig R.¹  Popp, Brian N.¹  Whittier, Robert B.²  Dulai, Henrietta¹ 

[1] Univ Hawaii Manoa, Dept Geol & Geophys, 1680 East West Rd,POST 701, Honolulu, HI 96822 USA

[2] Hawaii Dept Hlth, Safe Drinking Water Branch, 919 Ala Moana Blvd, Honolulu, HI 96814 USA

关键词: Wastewater treatment;    Underground injection;    Nitrogen cycle;    Denitrification;    Anammox;    Submarine groundwater discharge;   

DOI  :  10.1016/j.marpolbul.2016.06.050

来源: Elsevier

【 摘 要 】

We utilize N and C species concentration data along with delta N-15 values of NO3- and delta C-13 values of dissolved inorganic C to evaluate the stoichiometry of biogeochemical reactions (mineralization, nitrification, anammox, and denitrification) occurring within a subsurface wastewater plume that originates as treated wastewater injection and enters the coastal waters of Maui as submarine groundwater discharge. Additionally, we compare wastewater effluent time-series data, injection rates, and treatment history with submarine spring discharge time-series data. We find that heterotrophic denitrification is the primary mechanism of N loss within the groundwater plume and that chlorination for pathogen disinfection suppresses microbial activity in the aquifer responsible for N loss, resulting in increased coastal ocean N loading. Replacement of chlorination with UV disinfection may restore biogeochemical reactions responsible for N loss within the aquifer and return N-attenuating conditions in the effluent plume, reducing N loading to coastal waters. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free