Generation Pattern of Sulfur Containing Gases from Anaerobically Digested Sludge Cakes

Novak, John T.; Adams, Gregory; Chen, Yen Chih; Erdal, Zeynep; Forbes, Robert H.; Glindemann, Dietmar; Hargreaves, J. Ronald; Hentz, Lawrence H.; Higgins, Matthew J.; Murthy, Sudhir; Witherspoon, Jay

doi:10.2175/106143006x101700

Cited by 29 publications

(7 citation statements)

References 7 publications

(12 reference statements)

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“…Incubation of dewatered biosolids was conducted to analyze the accumulation of specific volatile organic sulfur compounds (VOSC) as indicators of biosolids odor production Novak et al, 2006). Specific VOSC species associated with dewatered biosolids were measured using a cryotrapping gas chromatograph (HP 5890 [Hewlett Packard, Palo Alto, California])-mass selective detector (HP 5970).…”

Section: Methodsmentioning

confidence: 99%

Anaerobic Digestion of Raw and Thermally Hydrolyzed Wastewater Solids Under Various Operational Conditions

Wilson¹,

Tanneru²,

Banjade³

et al. 2011

Water Environment Research

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BSTRACT; In this study, high-solids anaerobic digestion of thermally pretreated wastewater solids (THD) was compared with conventional mesophilic anaerobic digestion (MAD). Operational conditions, such as pretreatment temperature {150 to 170 C), solids retention time (15 to 20 days), and digestion temperature (37 to 42 C), were varied for the seven THD systems operated. Volatile solids reduction (VSR) by THD ranged from 56 to 62%, compared with approximately 50% for MAD. Higher VSR contributed to 24 to 59% increased biogas production (m^/kg VSR-d) from THD relative to MAD. The high-solids conditions of the THD feed resulted in high total ammonia-nitrogen (proportional to solids loading) and total alkalinity concentrations in excess of 14 g/L as calcium carbonate (CaCOs). Increased pH in THD reactors caused 5 to 8 times more un-ionized ammonia to be present than in MAD, and this likely led to inhibition of aceticlastic methanogens, resulting in accumulation of residual volatile fatty acids between 2 and 6 g/L as acetic acid. The THD produced biosolids cake that possessed low organic sulfur-based biosolids odor and dewatered to between 33 and 39% total solids. Dual conditioning with cationic polymer and ferric chloride was shown to be an effective strategy for mitigating dissolved organic nitrogen and UV-quenching compounds in the return stream following centrifugal dewatering of THD biosolids. Water Environ. Res., 83, 815 (2011).

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Section: Methodsmentioning

confidence: 99%

Anaerobic Digestion of Raw and Thermally Hydrolyzed Wastewater Solids Under Various Operational Conditions

Wilson¹,

Tanneru²,

Banjade³

et al. 2011

Water Environment Research

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“…Surplus sludge from biological wastewater treatment is very often anaerobically digested (Dewil et al, 2009;Novak et al, 2006). Owing to the high content of organic matter as well as biogenic and mineral sources of sulfur, sulfate reduction occurs during sludge digestion (Kijjanapanich et al 2014b;Kijjanapanich et al 2014c).…”

Section: Anaerobically Digested Sewage Sludgementioning

confidence: 99%

Treatment and reuse of solid materials containing inorganic sulfur compounds

Tichý¹,

Kijjanapanich²,

Lens³

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

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In the environment, different types of solid phase systems can contain high concentrations of inorganic sulfurous compounds, e.g. ores, soils and sediments. The key criterion in the assessment of environmental risks of inorganic sulfurous compounds present in these materials is whether they remain bound to the solid phase or whether they are mobilized into the solution. Mobility of inorganic sulfur in natural water/solid biphasic systems is predominantly controlled by oxidative or reductive changes and precipitation constants of sulfurous compounds. In anaerobic environments, sulfur is encountered in its most reduced form, i.e. sulfidic form. Owing to the poor solubility of most sulfidic compounds, sulfurous compounds are predominantly immobile in anaerobic environments. On the contrary, in aerobic environments, the most stable inorganic sulfur compound is sulfate, which is usually very soluble in water. Reductive and oxidative changes of inorganic sulfurous compounds often involve an interaction with protons. Sulfur reduction is usually accompanied with alkalization of the environment, whereas sulfur oxidation often results in acidification. The general overview of the effects of reductive and oxidative

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“…The dewatered biosolids produced from the centrifuge exhibits exceptionally high odor emission. Typical odor‐causing compounds emitted from biosolids include hydrogen sulfide (H 2 S) and volatile organic sulfur compounds (VOSCs) such as methanethiol (MT) and dimethyl sulfide (DMS) (Novak et al, 2006). It is widely accepted that these odorous compounds are mainly generated from anaerobically fermented organic materials (Higgins et al, 2006; Schlegelmilch et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Aeration in sludge holding tanks as an economical means for biosolids odor control—A case study

Luo

Zhang

Taylor³

et al. 2021

Water Environment Research

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Abnormally high‐odor detection threshold (DT) values were detected for biosolids produced at one of the water resource recovery facilities (WRRFs) of Washington Suburban Sanitary Commission. As an inexpensive countermeasure, aeration of thickened sludge holding tanks (SHTs) was tested as a solution for mitigating the subsequent biosolids odor emission. Experimental results indicated that the extremely low‐oxidation reduction potential (ORP) in the SHTs and the fermentation of high‐rate‐activated sludge were primarily contributors to the odor emission from the dewatered cake. Two rounds of bench‐scale experiments on different days confirmed that aerating the sludge in holding tanks reduced peak emission concentrations of sulfurous odorous compounds such as hydrogen sulfide (H2S), methanethiol (MT), and dimethyl sulfide (DMS) from 203, 110, and 20 mg m−3 g−1 dry to 119, 70, and 14 mg m−3 g−1 dry, respectively. Further preliminary full‐scale validation study showed that even a slight ORP improvement from −180 mV to −162 mV reduced the peak H2S concentration from 87 to 48 mg m−3 g−1 dry and decreased the biosolids DT value from 4266 to 1862. It was concluded that lifting ORP in SHTs through aeration can be used by utilities as a simple means for biosolids odor control. Practitioner points Anaerobic storage of high‐rate active sludge was the main reason for the excessive biosolids odor. Aeration of sludge holding tanks can effectively reduce biosolids odor. A slight oxidation reduction potential improvement substantially reduced biosolids odor.

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Generation Pattern of Sulfur Containing Gases from Anaerobically Digested Sludge Cakes

Cited by 29 publications

References 7 publications

Anaerobic Digestion of Raw and Thermally Hydrolyzed Wastewater Solids Under Various Operational Conditions

Anaerobic Digestion of Raw and Thermally Hydrolyzed Wastewater Solids Under Various Operational Conditions

Treatment and reuse of solid materials containing inorganic sulfur compounds

Aeration in sludge holding tanks as an economical means for biosolids odor control—A case study

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