Abstract
A new kind of micro-electrolysis filler sewage sludge biochar/zero valent iron (SSBC/ZVI) composite was prepared for a real chemical synthesis based pharmaceutical wastewater pretreatment for improving the biodegradation index (BI). The optimal operation condition of micro-electrolysis system was obtained at HRT of 2 h, the initial pH of 3.0 and filler dosage of 100 g/L, with COD removal rate of 30.5%. Characterization analysis of raw/used SSBC/ZVI filler and GC–MS analysis of raw/treated pharmaceutical wastewater were conducted to reveal the pollutant removal mechanisms by micro-electrolysis, and the results suggested that the pollutants removal was mainly attributed to the combination of reduction and oxidation, absorption of SSBC and flocculation of iron sludge. SSBC/ZVI exhibited relative high stability and excellent reusability for COD removal and BI improvement of real pharmaceutical wastewater after 4 runs. Moreover, the leaching tests of heavy metals (HMs) were conducted to investigate their release of the constituents in SS, and the results indicated that HMs leaching into the liquid from the filler was at a relative low level. This study provided new ideas of sewage sludge utilization for real wastewater pretreatment.
Highlights
The pharmaceutical industry is one of the most polluting industries which generating huge amount of wastewater during the production process
A new kind of micro-electrolysis filler sewage sludge biochar/zero violent iron (SSBC/ZVI) composite was prepared for a real chemical synthesis based pharmaceutical wastewater (CSPW) pretreatment for improving the biodegradation index (BI)
In order to characterize the characteristics of Sewage sludge bio-char (SSBC)/ZBI composite filler and identify the mechanism of pollutant removal, fresh and used SSBC/ZVI composite was characterized by SEM-EDX, fourier-transform infrared spectroscopy (FT-IR), x-ray diffraction (XRD) and specific surface area analysis
Summary
The pharmaceutical industry is one of the most polluting industries which generating huge amount of wastewater during the production process. PW treatment is a very challenging task because of its varying composition, recalcitrant nature, high toxicity, and low biodegradability [4]. Various techniques have been developed for PW treatment including physicochemical methods such as adsorption, sedimentation, advanced oxidation processes (AOPs) and biochemical methods [5, 6]. Biochemical processes provide the cheapest option for wastewater treatment, it often exhibits limited pollutants removal efficiency for PW with high toxicity. AOPs provide an efficient option to treat effluents with low biodegradability. Varieties kinds of AOPs techniques were explored to remove the refractory pollutants and to improve the biodegradability index (BI, BOD5/COD) of PW [7]
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