An Investigation of Impact of Iron and Aluminium Addition on the Anaerobic Digestion Process

Ofverstrom, Svetlana; Sapkaite, Ieva; Dauknys, Regimantas

doi:10.15626/eco-tech.2010.059

Cited by 2 publications

(2 citation statements)

References 9 publications

(11 reference statements)

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“…The current study showed a 19.65% and 35.16% reduction in the biogas volumes after CPR treatment with 100 mg/L of Al 3+ and Fe 3+ salts, respectively. This is in agreement with the range of 20%-50% reduction previously reported by Ofverstrom et al [30]. Although the previous studies were on mixed sludge, the current research provides data on SAS and compares the biogas reduction effects of alum and ferric salts.…”

Section: Effects Of Aluminium and Ferric Dosing On Biogas Productionsupporting

confidence: 92%

The Effects of Aluminium- and Ferric-Based Chemical Phosphorus Removal on Activated Sludge Digestibility and Dewaterability

Ojo

Ifelebuegu

2019

Processes

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The uses of Al3+ and Fe3+ salts in chemical phosphorus removal (CPR) in activated sludge plants have increased considerably in recent years and their full impacts on downstream processes such as dewaterability and digestibility are not fully understood. In this research, the effects of CPR on sludge digestibility and dewaterability were investigated in laboratory-scale experiments using sludge samples from a full-scale wastewater treatment plant. The results of the digestibility tests showed a 21% and 36% reduction in the biogas volume generated during anaerobic digestion of surplus activated sludge at 0.1 g/L doses of Al3+ and Fe3+ salts, respectively. This demonstrates that Al3+ dosing for CPR has less of a reduction effect compared with Fe3+ salts on biogas generation during anaerobic digestion of sludge. The dewaterability tests showed that primary sludge dewaterability was improved by up to 25% by Fe3+ and 16% by Al3+, while that of surplus activated sludge was reduced by 64% and 73%, respectively, at a metal salt dose of 50 mg/L. Consequently, a pre-precipitation process during CPR where phosphorus is removed in the primary tank would, therefore, enhance sludge dewaterability.

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Section: Effects Of Aluminium and Ferric Dosing On Biogas Productionsupporting

confidence: 92%

The Effects of Aluminium- and Ferric-Based Chemical Phosphorus Removal on Activated Sludge Digestibility and Dewaterability

Ojo

Ifelebuegu

2019

Processes

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“…Lab-scale BT, AS dosed with Fe (Smith and Carliell-Marquet, 2009) 12-20% less biogas; 10-22% less methane Lab-scale AD, mixture of primary and activated sludge dosed with Fe (Ofverstrom et al, 2010) 20-50% less biogas…”

Section: Control Ammonia Toxicitymentioning

confidence: 99%

Mechanistic Understanding of Beneficial Aspects of Iron Salts and Waterworks Sludge Uses in Urban Wastewater System

Shrestha¹

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Iron (Fe)-salts are widely used as the inorganic chemical coagulants for water and wastewater treatment processes. In retrospect, Fe-salts application in different domains of the urban wastewater system (UWWS) (e.g. sewers, bioreactor, digester) has been in isolation. The choice and application of Fe-salts are at present primarily driven by considerations merely at the subsystem level, with their I acknowledge that the copyright of all material contained in my thesis resides with the copyright holder(s) of that material. Where appropriate I have obtained copyright permission from the copyright holder to reproduce material in this thesis and have sought permission from co-authors for any jointly authored works included in the thesis. vi Publications during candidature Peer-reviewed scientific journal articles • Sohan Shrestha, Keshab Sharma, Zhongwei Chen, Zhiguo Yuan (2019). Unravelling the influences of sewer-dosed iron salts on activated sludge properties with implications on settleability, dewaterability and sludge rheology.

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An Investigation of Impact of Iron and Aluminium Addition on the Anaerobic Digestion Process

Cited by 2 publications

References 9 publications

The Effects of Aluminium- and Ferric-Based Chemical Phosphorus Removal on Activated Sludge Digestibility and Dewaterability

The Effects of Aluminium- and Ferric-Based Chemical Phosphorus Removal on Activated Sludge Digestibility and Dewaterability

Mechanistic Understanding of Beneficial Aspects of Iron Salts and Waterworks Sludge Uses in Urban Wastewater System

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