Balancing hygienization and anaerobic digestion of raw sewage sludge

被引：81

作者：

Astals, S. ^{[1
]}

Venegas, C. ^{[2
]}

Peces, M. ^{[1
]}

Jofre, J. ^{[2
,3
]}

Lucena, F. ^{[2
,3
]}

Mata-Alvarez, J. ^{[1
,3
]}

机构：

[1] Univ Barcelona, Dept Chem Engn, E-08028 Barcelona, Spain

[2] Univ Barcelona, Dept Microbiol, E-08028 Barcelona, Spain

[3] Univ Barcelona, Water Res Inst, Barcelona 08034, Spain

来源：

WATER RESEARCH | 2012年 / 46卷 / 19期

关键词：

Anaerobic digestion; Sewage sludge; Hygienization; Indicators; Temperature; Energy balance; WASTE-ACTIVATED-SLUDGE; CLASS-A BIOSOLIDS; THERMOPHILIC DIGESTION; MESOPHILIC-DIGESTION; SOMATIC COLIPHAGES; PROCESS STABILITY; WATER TREATMENT; PILOT-SCALE; VIRUSES; INACTIVATION;

D O I：

10.1016/j.watres.2012.07.035

中图分类号：

X [环境科学、安全科学];

学科分类号：

083001 [环境科学];

摘要：

The anaerobic digestion of raw sewage sludge was evaluated in terms of process efficiency and sludge hygienization. Four different scenarios were analyzed, i.e. mesophilic anaerobic digestion, thermophilic anaerobic digestion and mesophilic anaerobic digestion followed by a 60 degrees C or by an 80 degrees C hygienization treatment. Digester performance (organic matter removal, process stability and biogas yield) and the hygienization efficiency (reduction of Escherichia coli, somatic coliphages and F-specific RNA phages) were the main examined factors. Moreover, a preliminary economical feasibility study of each option was carried out throughout an energy balance (heat and electricity). The obtained results showed that both thermophilic anaerobic digestion and mesophilic anaerobic digestion followed by a hygienization step were able to produce an effluent sludge that fulfills the American and the European legislation for land application. However, higher removal efficiencies of indicators were obtained when a hygienization post-treatment was present. Regarding the energy balance, it should be noted that all scenarios have a significant energy surplus. Particularly, positive heat balances will be obtained for the thermophilic anaerobic digestion and for the mesophilic anaerobic digestion followed by 60 degrees C hygienization post-treatment if an additional fresh-sludge/digested sludge heat exchanger is installed for energy recovery. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：6218 / 6227

页数：10

共 60 条

[1]

Laboratory evaluation of thermophilic-anaerobic digestion to produce class a biosolids. 2. Inactivation of pathogens and indicator organisms in a continuous flow reactor followed by batch treatment [J].