Abstract
To investigate the removal of thiocyanate () in the actual coking wastewater through granular bio-film reactor, two lab-scale granular bio-film reactors (EGSB reactor) (RA and RB) were continuously operated at three stages for about 16 months: anaerobic vs. micro-aerobic for EGSB reactor, varied influent concentrations and varied shock-loading (abrupt and gradual shock-loading) for micro-aerobic EGSB reactor. Compared with anaerobic operation condition, micro-aerobic operation conditions could distinctly strengthen average removal in the EGSB reactor treating actual coking wastewater (47.8% vs.5.3%). At micro-aerobic operation conditions (only with 2000-5000ml·min-1 air flow rate in the external aeration column), with 12h HRT and varied influent concentrations of 200-540mg·L-1, the EGSB reactor could always keep very high removal of 87.6%-94.1%. Microaerobic EGSB reactor had very strong ability of supporting load shock. During the whole operation stage of continuous loads shock (for about 60 days)(from 0.32kgSCN·m-3·d-1 to 1.08 kgSCN·m-3·d-1), removal ability showed a constantly increasing tendency. Micro-aerobic EGSB reactor was a simple and high effectively treatment strategy for the in the actual coking wastewater, and meanwhile high COD, ammonia, phenol and cyanide removal was also kept in the micro-aerobic EGSB reactor.
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