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Chromium and nickel toxicity during the biotreatment of high ammonia landfill leachate
Author(s) -
Harper Susan C.,
Manoharan Ramanathan,
Mavinic Donald S.,
Randall Clifford W.
Publication year - 1996
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143096x127172
Subject(s) - leachate , chromium , nitrification , chemistry , environmental chemistry , denitrification , nickel , ammonia , phosphorus , zinc , nitrogen , organic chemistry
Two nitrification‐denitrification systems were used to determine the possible inhibitory and/or toxic effects of supplemental chromium and nickel addition to the nitrification‐denitrification process in the treatment of a relatively high ammonia, low biodegradable carbon, municipal landfill leachate. Results indicated that chromium (Cr +3 ) and nickel (Ni +2 ) caused inhibitory effects to the system at soluble concentrations of approximately 0.30 and 0.70 mg/L, respectively. Chromium affected both the nitrification and denitrification process, whereas nickel impaired only the nitrification performance; denitrification was unaffected at the nickel concentrations used. The failures were believed to be due to either the soluble metal levels themselves or the buildup of metals in the solids, although lack of long‐term acclimation cannot be ruled out. No phosphorus deficiency was noted in either case. This ruled out the possibility of system failures due to lack of bioavailable phosphorus, as reported with zinc in the early stages of this study.