Anaerobic digestion of alcohol sulfate (anionic surfactant) rich wastewater – batch experiments. Part II: influence of the hydrophobic chain length

Swine manure mono-digestion results in relatively low methane productivity due to the low degradation rate of its solid fraction (manure fibers), and due to the high ammonia and water content. The aqueous ammonia soaking (AAS) pretreatment of manure fibers has been proposed for overcoming these limitations. In this study, continuous anaerobic digestion (AD) of manure mixed with optimally AAS-treated manure fibers was compared to the AD of manure mixed with untreated manure fibers. Due to lab-scale pumping restrictions, the ratio of AAS-optimally treated manure fibers to manure was only 1/3 on a total solids (TS) basis. However, the biogas productivity and methane yield were improved by 17% and 38%, respectively, also confirming the predictions from a simplified 1st order hydrolysis model based on batch experiments. Furthermore, an improved reduction efficiency of major organic components was observed for the digester processing AAS-treated manure fibers compared to the non-treated one (e.g., 42% increased reduction for cellulose fraction). A preliminary techno-economic analysis of the proposed process showed that mixing raw manure with AAS manure fibers in large-scale digesters could result in a 72% increase of revenue compared to the AD of manure mixed with untreated fibers and 135% increase compared to that of solely manure.

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Aggregation properties of zwitterionic surfactants with different ionic headgroups, hydrophobic chain length and inter-charge spacers

Colloids and Surfaces A Physicochemical and Engineering Aspects ◽

10.1016/j.colsurfa.2008.09.030 ◽

2009 ◽

Vol 333 (1-3) ◽

pp. 108-114 ◽

Cited By ~ 19

Author(s):

Yingxiong Wang ◽

Xu Huang ◽

Yajuan Li ◽

Jinben Wang ◽

Yilin Wang

Keyword(s):

Chain Length ◽

Zwitterionic Surfactants ◽

Hydrophobic Chain

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Interfacial and Thermodynamic Properties of Anionic‐Nonionic Mixed Surfactant System: Influence of Hydrophobic Chain Length of the Nonionic Surfactant

Journal of Dispersion Science and Technology ◽

10.1080/01932690600719248 ◽

2006 ◽

Vol 27 (6) ◽

pp. 861-868 ◽

Cited By ~ 4

Author(s):

Mahesh M. Kadam ◽

Manohar R. Sawant

Keyword(s):

Thermodynamic Properties ◽

Nonionic Surfactant ◽

Chain Length ◽

Mixed Surfactant ◽

Mixed Surfactant System ◽

Surfactant System ◽

Hydrophobic Chain

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Liposomes coated with hydrophobically modified hydroxyethyl cellulose: Influence of hydrophobic chain length and degree of modification

Colloids and Surfaces B Biointerfaces ◽

10.1016/j.colsurfb.2017.04.061 ◽

2017 ◽

Vol 156 ◽

pp. 79-86 ◽

Cited By ~ 8

Author(s):

Gro Smistad ◽

Bo Nyström ◽

Kaizheng Zhu ◽

Marthe Karoline Grønvold ◽

Anne Røv-Johnsen ◽

...

Keyword(s):

Chain Length ◽

Hydroxyethyl Cellulose ◽

Hydrophobically Modified ◽

Hydrophobic Chain

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Effects of thermochemical pretreatment on the anaerobic digestion of waste activated sludge

Water Science & Technology ◽

10.2166/wst.1997.0315 ◽

1997 ◽

Vol 35 (8) ◽

pp. 209-215 ◽

Cited By ~ 77

Author(s):

Shuzo Tanaka ◽

Toshio Kobayashi ◽

Ken-ichi Kamiyama ◽

Ma. Lolita N. Signey Bildan

Keyword(s):

Anaerobic Digestion ◽

Activated Sludge ◽

Production Rate ◽

Methane Production ◽

Waste Activated Sludge ◽

Batch Experiments ◽

Industrial Wastewaters ◽

Thermochemical Pretreatment ◽

Chemical Heating ◽

Methane Production Rate

Effects of pretreatment on the anaerobic digestion of waste activated sludge (WAS) were investigated in terms of VSS solubilization and methane production by batch experiments. The methods of pretreatment studied are NaOH addition (chemical), heating (thermal) and heating with NaOH addition (thermochemical) to the domestic WAS and to the combined WAS from domestic, commercial and industrial wastewaters. The thermochemical pretreatment gave the best result among three methods in the combined WAS, i.e., the VSS was solubilized by 40-50% and the methane production increased by more than 200% over the control when the WAS was heated at 130°C for 5 minutes with the dose 0.3 g NaOH/g VSS. In the domestic WAS, the VSS solubilization rate was 70-80% but the increase of the methane production was about 30% after thermochemically pretreated. The domestic WAS consists of 41% protein, 25% lipid and 14% carbohydrate on COD basis, and the solubilization rate of protein, which is the largest constituent of the WAS, was 63% in the thermochemical pretreatment. Although the effect of the thermochemical pretreatment on the methane production was higher to the combined WAS than to the domestic WAS, the methane production rate was 21.9 ml CH4/g VSSWAS·day in the domestic WAS and 12.8 ml CH4/g VSSWAS·day in the combined WAS.

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