Molecular weight distribution of pretreated thickened waste activated sludge and fat, oil, and grease

Alqaralleh, Rania Mona; Kennedy, Kevin J.; Delatolla, Robert

doi:10.1007/s11356-020-07906-1

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…Meanwhile, under the treatment temperature of 80°C, 100°C, 120°C, 140°C and 160°C, VS content of the treated sludge decreased by 2.69%, 6.83%, 14.49%, 17.18% and 19.88%, respectively. The release of intracellular and extracellular substances after microwave radiation could be represented by SCOD in the supernatant (Alqaralleh et al 2020). As shown in Figure 1(b), the SCOD concentration reached the highest value of 1,645.25 mg/L at 160°C.…”

Section: Resultsmentioning

confidence: 92%

“…Meanwhile, thermal hydrolysis treatment has also been applied to improving the dewaterability of sewage sludge before transportation and disposal (Fang et al 2017). As an alternative technology to conventional heating for sewage sludge treatment, microwave radiation has received much attention due to several advantages such as high energy utilization rate, fast heating rate and good selectivity (Eskicioglu et al 2007;Fang et al 2017;Alqaralleh et al 2020). However, previous studies mainly focused on the change of the physicochemical characteristics of the treated sludge, the migration and chemical speciation transformation of heavy metals in the sewage sludge during the microwaveassisted thermal hydrolysis process remained unclear, and it could influence the microbial community of the anaerobic digestion system as well as the subsequent treatment and disposal of the treated sludge.…”

Section: Introductionmentioning

confidence: 99%

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Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Qiu

Zheng

Wang

et al. 2021

Water Science and Technology

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The migration, transformation and ecological risk of heavy metals (Cr, As, Ni, Cu, Zn, Cd and Pb) in the sewage sludge during the microwave-assisted thermal hydrolysis process were investigated under different temperatures (80 °C, 100 °C, 120 °C, 140 °C, and 160 °C). The potential relationship between the bio-availability of heavy metals and the variables of microwave treatment, including pH, ammonium-nitrogen, soluble chemical oxygen demand, pH, soluble protein, soluble polysaccharide and volatile solid, was also explored. The results showed that the migration of heavy metals between solid-liquid phase mainly depended on the temperature. The percentage of all heavy metals (except Cu) in mobile (acid-soluble/exchangeable and reducible) forms decreased after microwave-assisted thermal hydrolysis treatment. The solubilization of compounds with C = O and O-H accompanied with the generation of organic and inorganic metal halides were also observed in the treated sludge through fourier transform infrared spectroscopy analysis. NH4+-N showed the highest negative correlation to the bio-availability of most heavy metals (except Cu and Cr) with coefficients (absolute value) over 0.87 (P < 0.05). VS showed a positive correlation to the bio-availability of most heavy metals (except Cu). The total potential ecological risk index (RI) decreased by 46.65% after microwave treatment at 160 °C.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Qiu

Zheng

Wang

et al. 2021

Water Science and Technology

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“…DOC molecular weight distribution is an important indicator to measure water quality. It is usually classified into very high MW biopolymers (20,000–200,000 Da), medium MW components (i.e., 1000–20,000 Da and 350–1000 Da) and low MW substances (1–350 Da) (Alqaralleh et al, 2020; Yaman et al, 2016). And polysaccharides and proteins were the main high MW biopolymers; medium MW components included humic‐like substances (about 1000 Da) and building blocks (350–1000 Da); low MW substances were small neutrals and acids.…”

Section: Methodsmentioning

confidence: 99%

Integration of coagulation and ozonation with flat‐sheet ceramic membrane filtration for shale gas hydraulic fracturing wastewater treatment: A laboratory study

Song

Liu³

et al. 2021

Water Environment Research

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The performance of the integrated process of coagulation and ozonation with ceramic membrane filtration was evaluated for the treatment of shale gas hydraulic fracturing flowback wastewater (HFFW). The removal efficiencies of carbon oxygen demand (CODCr), dissolved organic carbon (DOC), petroleum oils, and turbidity in effluent by the combined process were 87.1%, 72.2%, 94.3%, and 99.6%, respectively. Compared with sole membrane filtration, the transmembrane pressure (TMP) of ceramic membrane filtration was reduced by >99% with the integrated process. The coagulation and ozonation can effectively remove the organics with high molecular weights in the cake layer of ceramic membrane. To the best of our knowledge, this work proposed the combined process of coagulation, ozonation, and flat‐sheet ceramic membrane filtration for the treatment of HFFW for the first time. The water quality of the effluent met the discharge standard (Comprehensive Wastewater Discharge Standard GB8978‐1996). The findings can provide an important technical foundation for the innovation of integrated equipment for HFFW treatment. Practitioner points An integrated process combining coagulation and ozonation with flat‐sheet ceramic membrane ultrafiltration for the treatment of shale gas wastewater. The water quality of this integrated process met the discharge standard. Coagulation and ozonation effectively alleviated the membrane fouling related to organics with high molecular weights. A new avenue for on‐site treatment of shale gas wastewater and an alternative of the current centralized wastewater management.

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Application of an efficient, cost-effective and newly developed single-process SAO/PND technology for treating brewery industry effluent

Hosseinlou

2022

South African Journal of Chemical Engineering

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Molecular weight distribution of pretreated thickened waste activated sludge and fat, oil, and grease

Cited by 3 publications

References 27 publications

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Migration and transformation of heavy metals during the microwave-assisted thermal hydrolysis of sewage sludge

Integration of coagulation and ozonation with flat‐sheet ceramic membrane filtration for shale gas hydraulic fracturing wastewater treatment: A laboratory study

Application of an efficient, cost-effective and newly developed single-process SAO/PND technology for treating brewery industry effluent

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