Radiofrequency-oxidation treatment of sewage sludge

Srinivasan, Asha; Young, Chris; Liao, Ping; Lo, K.V.

doi:10.1016/j.chemosphere.2015.07.053

Cited by 7 publications

(5 citation statements)

References 35 publications

(34 reference statements)

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“…More studies on the effect of temperature on phosphorus release are currently ongoing. Overall, the results from this and our earlier microwave studies [30,31] re-affirm that the process effectively disintegrated the solids, released nutrients and metals, and improved dewaterability and settling of the sludge. The resulting solution would be ideal for struvite crystallization and anaerobic digestion for methane production.…”

Section: Nutrient Releasesupporting

confidence: 81%

Continuous‐flow microwave enhanced oxidation process for treating sewage sludge

Liao

Srinivasan

2016

Can J Chem Eng

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The microwave-enhanced advanced oxidation (MW/H 2 O 2 -AOP) treatment of sewage sludge in a continuous-flow 915 MHz microwave system was studied. A higher H 2 O 2 dosage at the same flow rate resulted in better solids disintegration in terms of higher soluble chemical oxygen demand. The highest soluble chemical oxygen demand concentration of 5174 mg/L was obtained at a dosage of 0.005 L/L (0.5 % v/v). A higher soluble chemical oxygen demand was obtained at a higher flow rate with the same H 2 O 2 dosage. A substantial amount of soluble phosphorus (over 60 % of total phosphorus content) was produced for all treatments, regardless of H 2 O 2 dosage. A first-order reaction kinetics of soluble chemical oxygen demand was proposed in this study. Real-time energy consumption corresponding to performance efficacy, which provides a realistic assessment of the process efficiency, was calculated. Energy consumption was found to vary between 0.22-0.29 kWh/L of sludge treated. The results demonstrated that a continuous-flow 915 MHz microwave system resulted in high treatment efficiency in terms of nutrient release, solids disintegration, and low energy consumption, which is suitable for real-time industrial applications.

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Section: Nutrient Releasesupporting

confidence: 81%

Continuous‐flow microwave enhanced oxidation process for treating sewage sludge

Liao

Srinivasan

2016

Can J Chem Eng

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“…This could be explained with the reduced surface charge at low pH owing to formation of hydronium ions, which minimises electrostatic repulsion and allows coagulation of floc increasing settling . It shall be noted that the pH range of 2·6-3·6 is the iso-electric point of sewage sludge, which makes it more stable improving the dewatering ability (Neyens et al, 2003;Srinivasan et al, 2015). The resulting MW/H 2 O 2 -AOP treated foam at 180°C, pH 3 and 0·5% hydrogen peroxide dosage also had the highest SCOD and VFA concentration and settled very fast.…”

Section: Settling and Dewateringmentioning

confidence: 90%

Nutrient recovery from foam with microwave treatment

MoreAbhilasha

Srinivasan

Huang

et al. 2015

Journal of Environmental Engineering and Science

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Phosphorus recovery and solids reduction potential from foam generated in the anoxic reactor of membrane-enhanced biological phosphorus removal system were studied using the microwave-enhanced advanced oxidation process (MW/H 2 O 2 -AOP). The MW/H 2 O 2 -AOP-treated foam at different experimental conditions showed significant improvement in solubilisation of orthophosphate, ammonia, volatile fatty acids and soluble chemical oxygen demand as well as settling and dewatering ability. The most significant factors maximising orthophosphate release in the order of most to least affecting were (i) microwave heating temperature, (ii) combined effect of microwave heating temperature and hydrogen peroxide addition and (iii) addition of sulfuric acid. At temperature 180°C, pH 3 and hydrogen peroxide dosage 0·5% v/v, nutrient solubilisation, settling, and dewatering properties were at their maximum with 67% of the total phosphate solubilised as orthophosphate.

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“…The higher the soluble organic matter (SCOD), the more favorable for the subsequent aerobic/anaerobic digestion of the sludge. Thermal-chemical technology was used to treat sludge and it was found that SCOD increased significantly during O 3 treatment [ 48 ]. At an O 3 dose of 0.1 g/g DS, the SCOD increased from 240 mg/L to 960 mg/L.…”

Section: Application Of Ozone In Sludge Dewateringmentioning

confidence: 99%

Application of Advanced Oxidation Technology in Sludge Conditioning and Dewatering: A Critical Review

Xia¹,

Ji²,

Hu³

et al. 2022

IJERPH

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Sludge dewatering is an important link in sludge treatment. In practical engineering, the dewatering effect of unconditioned sludge is very poor. The use of advanced oxidation technology can improve sludge dewatering performance, reduce sludge capacity, and remove micro-pollutants, which is beneficial for sludge post-treatment and disposal. Based on the current status of sludge conditioning and dehydration, the characteristics of the advanced oxidation method for sludge dehydration were systematically explained using various free radical reaction mechanisms and dehydration conditions. The effects of various advanced oxidation technologies on sludge conditioning and dewatering has been extensively discussed. Finally, the application prospects of the advanced oxidation technology in sludge conditioning and dewatering are presented.

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Radiofrequency-oxidation treatment of sewage sludge

Cited by 7 publications

References 35 publications

Continuous‐flow microwave enhanced oxidation process for treating sewage sludge

Continuous‐flow microwave enhanced oxidation process for treating sewage sludge

Nutrient recovery from foam with microwave treatment

Application of Advanced Oxidation Technology in Sludge Conditioning and Dewatering: A Critical Review

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