Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
583628 | Journal of Hazardous Materials | 2008 | 9 Pages |
Abstract
Biological treatment system especially, sequencing batch reactor (SBR) system could not be applied to treat the raw electroplating wastewater (EPWW) due to the low organic matter concentration of 10 ± 3 mg-BOD5/L and toxic of high cyanide concentration of 23.0 ± 2.2 mg-CN/L. However, EPWW could be used as the nitrogen source for the bio-sludge of SBR system. And 10% of EPWW (the final cyanide concentration of 2.3 ± 0.2 mg/L) was most suitable to supplement into the wastewater as the nitrogen source. SBR system showed the highest COD, BOD5, TKN and cyanide removal efficiencies of 79 ± 2%, 85 ± 3%, 49.0 ± 2.1% and 97.7 ± 0.7%, respectively with 4-times diluted Thai-rice noodle wastewater (TRNWW) containing 10% EPWW and 138 mg/L NH4Cl (BOD5: TN of 100:10) at SRT of 72 ± 13 days (under organic and cyanide loadings of 0.40 kg-BOD5/m3 d and 0.0023 kg-CN/m3 d, respectively). However, the effluent ammonia was still high of 22.6 ± 0.4 mg-N/L while the effluent nitrate and nitrite was only 9.9 ± 0.4 and 1.2 ± 0.9 mg-N/L, respectively. And SVI and effluent SS of the system were higher than 95 and 75 mg/L, respectively.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Suntud Sirianuntapiboon, Kanidta Chairattanawan, Methinee Rarunroeng,