Abstract
The behavior of inorganic elements (including phosphorus, nitrogen, and metals) during sludge ozonation was investigated using batch tests and the effects of metals on sludge solubilization were elucidated. A decrease of ~50% in the ratio of sludge solubilization was found to relate to a high iron content 80-120mgFe/gSS than that of 4.7-7.4mgFe/gSS. During sludge ozonation, the pH decreased from 7 to 5, which resulted in the dissolution of chemically precipitated metals and phosphorus. Based on experimental results and thermodynamic calculation, phosphate precipitated by iron and aluminum was more difficult to release while that by calcium released with decrease in pH. The release of barium, manganese, and chrome did not exceed 10% and was much lower than COD solubilization; however, that of nickel, copper, and zinc was similar to COD solubilization. The ratio of nitrogen solubilization was 1.2 times higher than that of COD solubilization (R2=0.85). Of the total nitrogen solubilized, 80% was organic nitrogen. Because of their high accumulation potential and negative effect on sludge solubilization, high levels of iron and aluminum in both sewage and sludge should be considered carefully for the application of the advanced sewage treatment process with sludge ozonation and phosphorus crystallization.
| Original language | English |
|---|---|
| Pages (from-to) | 2029-2037 |
| Number of pages | 9 |
| Journal | Water Research |
| Volume | 45 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Feb 2011 |
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Keywords
- Excess sludge reduction
- Metals
- Nitrogen
- Phosphorus
- Sludge ozonation
- Thermodynamic calculation
ASJC Scopus subject areas
- Water Science and Technology
- Waste Management and Disposal
- Pollution
- Ecological Modelling
Cite this
Behavior of inorganic elements during sludge ozonation and their effects on sludge solubilization. / Sui, Pengzhe; Nishimura, Fumitake; Nagare, Hideaki; Hidaka, Taira; Nakagawa, Yuko; Tsuno, Hiroshi.
In: Water Research, Vol. 45, No. 5, 02.2011, p. 2029-2037.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Behavior of inorganic elements during sludge ozonation and their effects on sludge solubilization
AU - Sui, Pengzhe
AU - Nishimura, Fumitake
AU - Nagare, Hideaki
AU - Hidaka, Taira
AU - Nakagawa, Yuko
AU - Tsuno, Hiroshi
PY - 2011/2
Y1 - 2011/2
N2 - The behavior of inorganic elements (including phosphorus, nitrogen, and metals) during sludge ozonation was investigated using batch tests and the effects of metals on sludge solubilization were elucidated. A decrease of ~50% in the ratio of sludge solubilization was found to relate to a high iron content 80-120mgFe/gSS than that of 4.7-7.4mgFe/gSS. During sludge ozonation, the pH decreased from 7 to 5, which resulted in the dissolution of chemically precipitated metals and phosphorus. Based on experimental results and thermodynamic calculation, phosphate precipitated by iron and aluminum was more difficult to release while that by calcium released with decrease in pH. The release of barium, manganese, and chrome did not exceed 10% and was much lower than COD solubilization; however, that of nickel, copper, and zinc was similar to COD solubilization. The ratio of nitrogen solubilization was 1.2 times higher than that of COD solubilization (R2=0.85). Of the total nitrogen solubilized, 80% was organic nitrogen. Because of their high accumulation potential and negative effect on sludge solubilization, high levels of iron and aluminum in both sewage and sludge should be considered carefully for the application of the advanced sewage treatment process with sludge ozonation and phosphorus crystallization.
AB - The behavior of inorganic elements (including phosphorus, nitrogen, and metals) during sludge ozonation was investigated using batch tests and the effects of metals on sludge solubilization were elucidated. A decrease of ~50% in the ratio of sludge solubilization was found to relate to a high iron content 80-120mgFe/gSS than that of 4.7-7.4mgFe/gSS. During sludge ozonation, the pH decreased from 7 to 5, which resulted in the dissolution of chemically precipitated metals and phosphorus. Based on experimental results and thermodynamic calculation, phosphate precipitated by iron and aluminum was more difficult to release while that by calcium released with decrease in pH. The release of barium, manganese, and chrome did not exceed 10% and was much lower than COD solubilization; however, that of nickel, copper, and zinc was similar to COD solubilization. The ratio of nitrogen solubilization was 1.2 times higher than that of COD solubilization (R2=0.85). Of the total nitrogen solubilized, 80% was organic nitrogen. Because of their high accumulation potential and negative effect on sludge solubilization, high levels of iron and aluminum in both sewage and sludge should be considered carefully for the application of the advanced sewage treatment process with sludge ozonation and phosphorus crystallization.
KW - Excess sludge reduction
KW - Metals
KW - Nitrogen
KW - Phosphorus
KW - Sludge ozonation
KW - Thermodynamic calculation
UR - http://www.scopus.com/inward/record.url?scp=79951577569&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79951577569&partnerID=8YFLogxK
U2 - 10.1016/j.watres.2010.12.011
DO - 10.1016/j.watres.2010.12.011
M3 - Article
C2 - 21215984
AN - SCOPUS:79951577569
VL - 45
SP - 2029
EP - 2037
JO - Water Research
JF - Water Research
SN - 0043-1354
IS - 5
ER -