Abstract：
:Cadmium (Cd) is toxic to nitrifying bacteria, but current studies on recovery process in Cd-inhibited activated sludge system are limited, especially on intensify-recovery processes with developing and optimizing nontoxic bio-accelerators. In this study, bioactivity recovery effects were demonstrated with respect to effluent NH4(+)-N, NO2(-)-N, NO3(-)-N concentrations, specific oxygen uptake rates and cadmium distribution in five parallel SBRs. Results indicated that bioactivity of nitrifying bacteria was mainly inhibited by surface-bound Cd. Dosing biotin, l-aspartic acid and cytokinin simultaneously was the most effective. Linear chain, together with amide (NH) and carboxyl (COOH) groups, may be important factors in fast nitrification recovery process. In terms of dosage and dosing mode, six-multiple dosage of optimal mixture with dosing at each cycle evenly was the most effective and bioactivities of nitrifying bacteria could 100% recovered within 7days. The bio-accelerators and optimum usage can be potentially applied to cope with heavy metal shock-loading emergency situations.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Wang Y,Ji M,Zhao Y,Zhai Hdoi
10.1016/j.biortech.2015.10.089subject
Has Abstractpub_date
2016-01-01 00:00:00pages
812-9eissn
0960-8524issn
1873-2976pii
S0960-8524(15)01493-5journal_volume
200pub_type
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