Hydrothermal degradation of organic matter in municipal sludge using non-catalytic wet oxidation

Baroutian, Saeid; Smit, Anne-Marie; Andrews, John; Young, Brent R.; Gapes, Daniel J.

doi:10.1016/j.cej.2014.09.063

Cited by 72 publications

(21 citation statements)

References 31 publications

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“…Among the chemical oxidation processes, another used and studied is the WO [27][28][29]. This treatment allows us to obtain a drastic reduction of the organic matter in the SS at certain temperature conditions (150-360 • C), oxygen concentration (or air) and pressure (30-250 bar) and under continuous process conditions (contact time 15-120 min) [25,30,31].…”

Section: Wet Oxidation (Wo)mentioning

confidence: 99%

What Advanced Treatments Can Be Used to Minimize the Production of Sewage Sludge in WWTPs?

et al. 2019

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Similar to other types of waste, sewage sludge (SS) must be minimized, not only to respect the European Directive 2018/851 on waste, but also because the cost of sludge management is approximately 50% of the total running costs of a wastewater treatment plant (WWTP). Usually, minimization technologies can involve sewage sludge production with three different strategies: (i) adopting a process in the water line that reduces the production of sludge; (ii) reducing the water content (dewatering processes) or (iii) reducing the fraction of volatile solids (stabilization). This review, based on more than 130 papers, aims to provide essential information on the process, such as the advantages, the drawbacks and the results of their application. Moreover, significant information on the technologies still under development is provided. Finally, this review reports a discussion on the impact of the application of the proposed processes in the sludge line on a WWTP with a capacity exceeding 100,000 population equivalent (PE).

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Section: Wet Oxidation (Wo)mentioning

confidence: 99%

What Advanced Treatments Can Be Used to Minimize the Production of Sewage Sludge in WWTPs?

et al. 2019

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“…Previous research has investigated using anaerobic digestion (AD) or wet air oxidation (WAO) of wastes to remediate the nutrients (or, pollutants) from the wastewater [7,8]. AD has been shown to reduce the phosphorus contained in hydrothermal wastes by almost 50%, but requires a treatment time of up to 12 weeks [9].…”

Section: Introductionmentioning

confidence: 99%

“…AD has been shown to reduce the phosphorus contained in hydrothermal wastes by almost 50%, but requires a treatment time of up to 12 weeks [9]. WAO can reduce the amount of oxidizable carbon in the liquid but does not adequately reduce the amount of ammonia in the liquid [8]. Using existing wastewater treatment options to handle septic tank wastes would be expensive (with disposal costs potentially exceeding $1000 USD/dry ton) and counterproductive to the environmentally beneficial use of wastes.…”

Section: Introductionmentioning

confidence: 99%

Algal Remediation of Wastewater Produced from Hydrothermally Treated Septage

et al. 2019

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Hydrothermal carbonization (HTC) is a promising technology to convert wet wastes like septic tank wastes, or septage, to valuable platform chemical, fuels, and materials. However, the byproduct of HTC, process liquid, often contains large amount of nitrogen species (up to 2 g/L of nitrogen), phosphorus, and a variety of organic carbon containing compounds. Therefore, the HTC process liquid is not often treated at wastewater treatment plant. In this study, HTC process liquid was treated with algae as an alternative to commercial wastewater treatment. The HTC process liquid was first diluted and then used to grow Chlorella sp. over a short period of time (15 days). It was found that the algae biomass concentration increased by 644 mg/L over the course of 10 days, and which subsequently removed a majority of the nutrients in the HTC process liquid. Around 600 mg/L of algal biomass was collected in the process liquid at the end of treatment (day 15). Meanwhile, chemical oxygen demand (COD), total phosphorous, total Kheldjal nitrogen, and ammonia were reduced by 70.0, 77.7, 82.2, and 99.0% by fifteen days compared to the untreated wastewater, respectively. This study demonstrates that HTC process liquid can be treated by growing algae creating a potential replacement for expensive synthetic nutrient feeds for algal production.

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“…Recently, the WO of activated sludge was investigated [8][9][10] . It has been reported that the high biodegradability of WO effluent is well known as a carbon source for the denitrification process for the wastewater treatment [11] and as a substrate for biopolymers' production [12] .…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Degradation of Pharmaceutical Sludge by Wet Air Oxidation: A Pilot-scale Study

Zeng¹,

Li²,

Zhao³

2018

dteees

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In this study, wet air oxidation of pharmaceutical sludge was investigated through a pilot-scale reaction system. Oxygen gas was used as oxidant. The effects of reaction parameters on the process performance were discussed, such as temperature, reaction time, and oxygen supply. The results showed that the volatile suspended solids (VSS) removal rates were above 90%, and the total chemical oxygen demand (COD) removal rates were above 60%, which indicated that wet air oxidation is an ideal process for the degradation of pharmaceutical sludge.

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Hydrothermal degradation of organic matter in municipal sludge using non-catalytic wet oxidation

Cited by 72 publications

References 31 publications

What Advanced Treatments Can Be Used to Minimize the Production of Sewage Sludge in WWTPs?

What Advanced Treatments Can Be Used to Minimize the Production of Sewage Sludge in WWTPs?

Algal Remediation of Wastewater Produced from Hydrothermally Treated Septage

Highly Efficient Degradation of Pharmaceutical Sludge by Wet Air Oxidation: A Pilot-scale Study

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