Reliability of Biodegradation Measurements for Inhibitive Industrial Wastewaters

ChemEngineering

Toivo Kuokkanen¹  Hanna Prokkola¹  Ulla Lassi¹  Anne Heponiemi¹  Janne Pesonen¹ 

[1] Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland;

关键词: biodegradation;    BOD measurements;    manometric respirometry;    inhibition;    wastewater;    blank;   

DOI  :  10.3390/chemengineering6010015

来源: DOAJ

【 摘 要 】

Industrial wastewaters may contain toxic or highly inhibitive compounds, which makes the measurement of biological oxygen demand (BOD) challenging. Due to the high concentration of organic compounds within them, industrial wastewater samples must be diluted to perform BOD measurements. This study focused on determining the reliability of wastewater BOD measurement using two different types of industrial wastewater, namely pharmaceutical wastewater containing a total organic carbon (TOC) value of 34,000 mg(C)/L and industrial paper manufacturing wastewater containing a corresponding TOC value of 30 mg(C)/L. Both manometric respirometry and the closed-bottle method were used in the study, and the results were compared. It was found that the dilution wastewaters containing inhibitive compounds affected BOD values, which increased due to the decreased inhibiting effect of wastewater pollutants. Therefore, the correct BOD for effluents should be measured from undiluted samples, while the diluted value is appropriate for determining the maximum value for biodegradable organic material in the effluent. The accuracy of the results from the blank samples was also examined, and it was found that the readings of these were different to those from the samples. Therefore, the blank value that must be subtracted may differ depending on the sample.

【 授权许可】

Unknown