Title
Toxicity Studies of AKGA/Hydrazines Degradation By-Products and Their Compatibility with Sewage Treatment Plant Operation
Abbreviated Journal Title
Environ. Eng. Sci.
Keywords
hydrazine; PCA; aerobic degradation; activated sludge; mPCA; AKGA; toxicity; monomethylhydrazine; TESTS; Engineering, Environmental; Environmental Sciences
Abstract
A new method to treat hydrazine and monomethylhydrazine (MMH) using alpha-ketoglutaric acid (AKGA) was proposed. From the reaction of AKGA with hydrazine or MMH, two stable products are formed, 1,4,5,6-tetrahydro-6-oxo-3-pyridazinecarboxylic acid (PCA) and 1-methyl-1,4,5,6-tetrahydro-6-oxo-3-pyridazinecarboxylic acid (mPCA), respectively. With a focus toward use at an industrial facility, tests were undertaken to determine whether waste streams produced from this reaction can be metered into a municipal wastewater facility for final disposal. PCA and mPCA were analyzed for acute toxicity using crustaceans (Ceriodaphnia dubia) and fish (Pimephales promelas) and their effect on the wastewater treatment efficiency and viability using activated sludge (AS) microbes, and their biodegradability by AS organisms. Acute toxicity on crustaceans and fish was investigated according to the methods for acute toxicity by USEPA Method EPA-821-R-02-012. The effect of mPCA and PCA in the treatment efficiency and viability were estimated from respiration inhibition tests (USEPA, 2012) and heterotrophic plate counts. Last, the biodegradability of PCA and mPCA was assessed using the Closed Bottle Method. The results of this study showed that mPCA is significantly more toxic to C. dubia and P. promelas than PCA at the high concentrations ranges used in this study (0.5-1.5 g/L). On the other hand, PCA and mPCA did not show a significant inhibition of carbonaceous respiration of AS microbes at concentrations ranging from 0.5 to 1.5 g/L, although both exhibited some inhibitory effects on nitrification. Under the conditions of this study, PCA was biodegradable by AS while mPCA was not.
Journal Title
Environmental Engineering Science
Volume
32
Issue/Number
2
Publication Date
1-1-2015
Document Type
Article
Language
English
First Page
153
Last Page
162
WOS Identifier
ISSN
1092-8758
Recommended Citation
"Toxicity Studies of AKGA/Hydrazines Degradation By-Products and Their Compatibility with Sewage Treatment Plant Operation" (2015). Faculty Bibliography 2010s. 6778.
https://stars.library.ucf.edu/facultybib2010/6778
Comments
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