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Solubilisation of sludge by combined chemical and enzymatic treatment

Wawrzynczyk, Joanna LU ; Recktenwald, Michael LU ; Norrlöw, Olof LU and Dey, Estera LU (2007) In African Journal of Biotechnology 6(17). p.1994-1999
Abstract
In this study, the effects of cation-binding agents used alone and/or in combination with enzymes on solubilisation of municipal sludge and structure changes were investigated. Formic acid, citric acid, tartaric acid, EDTA, sodium tripolyphosphate (STPP), Zeolite A, sodium fluoride, sodium thiosulphate or sodium silicate were added to both biological and digested sludges. Citric acid ( 50 mmol/l) released the highest COD, amounting to 8 g/l from bio-sludge and 3 g/l from digested sludge. The highest specific dissolution rate was 0.5 g COD per mmol citric acid. COD released by STPP (50 mmol/l) was 3.3 g/l from bio-sludge and 2 g/l from digested sludge. STPP acted most efficiently to reduce suspended solids, 20% for digested and 40% for... (More)
In this study, the effects of cation-binding agents used alone and/or in combination with enzymes on solubilisation of municipal sludge and structure changes were investigated. Formic acid, citric acid, tartaric acid, EDTA, sodium tripolyphosphate (STPP), Zeolite A, sodium fluoride, sodium thiosulphate or sodium silicate were added to both biological and digested sludges. Citric acid ( 50 mmol/l) released the highest COD, amounting to 8 g/l from bio-sludge and 3 g/l from digested sludge. The highest specific dissolution rate was 0.5 g COD per mmol citric acid. COD released by STPP (50 mmol/l) was 3.3 g/l from bio-sludge and 2 g/l from digested sludge. STPP acted most efficiently to reduce suspended solids, 20% for digested and 40% for bio-sludge. The pre-treatment by the sequestering agents was followed by addition of three glycosidic enzymes. The used enzymes were more effective in hydrolysis of bio-sludge than in hydrolysis of the digested sludge. Additionally, after 4 h of incubation the remained enzymes activities in enzyme treated sludges were improved by up to 20%, indicating high stability of added enzymes. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
municipal waste water sludge, mass reduction, enzymatic treatment, biosolids, cation-binding agents
in
African Journal of Biotechnology
volume
6
issue
17
pages
1994 - 1999
publisher
Academic Journals
external identifiers
  • wos:000249985400004
  • scopus:34548570448
ISSN
1684-5315
language
English
LU publication?
yes
id
660385a2-196e-4929-9cc9-f736bd795120 (old id 655542)
alternative location
http://www.academicjournals.org/ajb/PDF/pdf2007/5Sep/Wawrzynczyk%20et%20al.pdf
date added to LUP
2007-12-21 09:10:10
date last changed
2017-07-23 04:47:35
@article{660385a2-196e-4929-9cc9-f736bd795120,
  abstract     = {In this study, the effects of cation-binding agents used alone and/or in combination with enzymes on solubilisation of municipal sludge and structure changes were investigated. Formic acid, citric acid, tartaric acid, EDTA, sodium tripolyphosphate (STPP), Zeolite A, sodium fluoride, sodium thiosulphate or sodium silicate were added to both biological and digested sludges. Citric acid ( 50 mmol/l) released the highest COD, amounting to 8 g/l from bio-sludge and 3 g/l from digested sludge. The highest specific dissolution rate was 0.5 g COD per mmol citric acid. COD released by STPP (50 mmol/l) was 3.3 g/l from bio-sludge and 2 g/l from digested sludge. STPP acted most efficiently to reduce suspended solids, 20% for digested and 40% for bio-sludge. The pre-treatment by the sequestering agents was followed by addition of three glycosidic enzymes. The used enzymes were more effective in hydrolysis of bio-sludge than in hydrolysis of the digested sludge. Additionally, after 4 h of incubation the remained enzymes activities in enzyme treated sludges were improved by up to 20%, indicating high stability of added enzymes.},
  author       = {Wawrzynczyk, Joanna and Recktenwald, Michael and Norrlöw, Olof and Dey, Estera},
  issn         = {1684-5315},
  keyword      = {municipal waste water sludge,mass reduction,enzymatic treatment,biosolids,cation-binding agents},
  language     = {eng},
  number       = {17},
  pages        = {1994--1999},
  publisher    = {Academic Journals},
  series       = {African Journal of Biotechnology},
  title        = {Solubilisation of sludge by combined chemical and enzymatic treatment},
  volume       = {6},
  year         = {2007},
}