Optimization of free nitrous acid pre-treatment on waste activated sludge

被引：33

作者：

Zahedi, S. ^{[1
]}

Romero-Guiza, M. ^{[2
]}

Icaran, Pilar ^{[2
]}

Yuan, Z. ^{[3
]}

Pijuan, M. ^{[1
]}

机构：

[1] Univ Girona, Catalan Inst Water Res ICRA, Emili Grahit St,101,H2O Bldg Sci & Technol Pk, Girona 17003, Spain

[2] FCC Aqualia, Dept Innovat & Technol, Balmes St 36,6thfloor, Barcelona 08007, Spain

[3] Univ Queensland, Adv Water Management Ctr, St Lucia, Qld 4072, Australia

来源：

BIORESOURCE TECHNOLOGY | 2018年 / 252卷

关键词：

Anaerobic digestion; Free-nitrous acid pre-treatment; Nitrite; Methane production; Waste activated sludge; Sludge biodegradability; METHANE PRODUCTION; EXPOSURE TIME; BIODEGRADABILITY; FERMENTATION; INHIBITION;

D O I：

10.1016/j.biortech.2017.12.090

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

The effectiveness of the Free Nitrous Acid (FNA) sludge treatment was tested in the range from 0 to 3.0 mg N-HNO2/L with acidified and neutral pH. 4 h pre-treatment times were used and the specific methane production (SMP) investigated. Results show that between 50 and 100 mg/L of N-NO2-/L disappeared during the FNA pre-treatment, reducing its effectiveness. A minimum level of nitrite (174 mg N-NO2-/L tested in this study), independently of pH/FNA, was necessary to assure the presence of the chemical throughout the duration of the pre-treatment. Sludge viability was compromised while WAS solubilization and SMP were enhanced with nitrite concentrations of 174 mg N-NO2-/L or higher, even at low FNA levels (< 0.15 mg N-HNO2/L). Results show that acidified pH is not needed to enhance methane production, making the pretreatment more economically and environmentally attractive.

引用

页码：216 / 220

页数：5

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