Use of an integrated biophysical process for the treatment of halo- and nitro- organic wastes
| Autor: | Chaim Sheindorf, Liron Shoshani, Asher Brenner |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Powdered activated carbon treatment
herbicides production wastes 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Membrane bioreactor 01 natural sciences membrane bioreactor Ammoniacal nitrogen Effluent lcsh:Environmental sciences 0105 earth and related environmental sciences General Environmental Science lcsh:GE1-350 Chemistry AOX powdered activated carbon nitrogen compounds 020801 environmental engineering Dilution Activated sludge Wastewater dual-sludge system Environmental chemistry biological wastewater treatment Nitrification |
| Zdroj: | AIMS Environmental Science, Vol 4, Iss 4, Pp 523-539 (2017) |
| ISSN: | 2372-0352 |
| Popis: | This study assessed the use of an integrated biophysical process incorporating the addition of powdered activated carbon (PAC) to a dual-sludge biological process, in order to improve the removal of problematic contaminants from complex herbicides production wastewater. The main focus was on the removal of nitrogen compounds, total organic carbon (TOC), and halogenated organics (AOX). The dual-sludge pilot setup comprised a conventional activated sludge (CAS) system followed by a membrane bioreactor (MBR) system. The dilution ratio of raw wastewater was gradually decreased (with groundwater) from 0.8 to 0 (no dilution), and PAC was added in the last phase of the study to maintain an equilibrium concentration of 2000 mg/L. PAC addition stimulated a high and steady removal (98%) of the ammoniacal nitrogen, conforming to the sea discharge limit of 5 mg/L. However, the effluent concentrations of total nitrogen, TOC, and AOX were still above the stringent discharge limits of 20, 100 and 0.5 mg/L respectively. Furthermore, it was shown that synergistic effect of various toxic organic compounds, rather than mineral salinity, was the major cause for the acute inhibitions of nitrification and AOX removal. The study showed that the proposed process can function as an efficient treatment system for the complex wastewater typically produced in the herbicide industry, however, it is recommended that complementary physico-chemical treatment steps be added to the treatment process. |
| Databáze: | OpenAIRE |
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