Treatment of refractory contaminants by sludge-derived biochar/persulfate system via both adsorption and advanced oxidation process. (October 2017)

• Record Type: Journal Article
• Authors: Wang, Jia; Liao, Zhuwei; Ifthikar, Jerosha; Shi, Lerong; Du, Yunan; Zhu, Jingyi; Xi, Shuang; Chen, Zhuqi; Chen, Zhulei
• Is Part Of: Chemosphere. Volume 185(2017)
• Page Start: 754
• Page End: 763
• Publication Date: 2017-10
• Subjects: Sludge-derived biochar -- Adsorption -- Persulfate -- Catalytic oxidation -- 4-ChloroPhenol -- Municipal landfill leachate; SDBC sludge-derived biochar -- PS persulfate -- 4-CP 4-chlorophenol -- EPR electron paramagnetic resonance -- AOPs advanced oxidation processes -- AC activated carbon -- MOF metal-organic framework -- nZVI nanoscale zero-valent iron -- MLL municipal landfill leachate -- MBR membrane bio-reactor -- TOC total organic carbon -- GAC granular activated carbon -- SEM scanning electron microscope -- EDX electron dispersive X-ray -- BET Brunauer Emmett Teller -- FTIR fourier transform infrared -- XRD X-ray diffraction -- XPS X-ray photoelectron spectroscopy -- AAS atomic absorption spectroscopy -- MeOH methanol -- TBA tert butyl alcohol -- PBQ benzoquinone -- PFRs Persistent free radicals; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.07.084
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A novel strategy for the removal of refractory organic contaminants was realized through sludge-derived biochar (SDBC)/persulfate (PS) system via both adsorption and advanced oxidation process under ambient conditions. SDBC was prepared by one single step of slow pyrolysis of municipal sewage sludge, appeared a porous structure, and contained abundant oxygen-containing functional groups as well as amorphous Fe species. Large surface area and porous structure of SDBC benefitted the adsorption and enrichment of contaminants, while oxygen-containing functional groups and Fe species on the surface were considered as reactive components for the activation of PS. Under conditions of [PS]0 = 1.85 mM, [4-chlorophenol]0 = 0.039 mM, [SDBC]0 = 1 g L −1, pH0 = 6.30 and temperature = 25 °C, the removal of model compound of 4-chlorophenol achieved 92.3%, and this significant performance of SDBC/PS system was consistent in a broad pH window. Radical scavengers and electron paramagnetic resonance (EPR) studies suggested that SDBC successfully activated PS to produce various oxidative radicals. Meanwhile, recycle experiments and Fe 3+ leaching tests further demonstrated the stability of SDBC during the activation of PS. Municipal landfill leachate effluent through a membrane bio-reactor was testified as the refractory real wastewater, in which both the removal of total organic carbon and ammonia was significant. Thus, SDBC showed certain advantages in PS activation such as feasible preparation method, remarkable efficiency and stability. These advantages proved SDBC/PS system as an effective strategy of controlling waste by waste, and implicated its potential application in full-scale for the treatment of refractory organic contaminants. Graphical abstract: Highlights: SDBC is prepared from sewage sludge by one-step synthesize. SDBC acts as adsorbent, support and catalyst. Consistent degradation is achieved under various pHs. This study provided a strategy of waste control by waste.