Transformation Kinetics of Phosphorus and Nitrogen in Iron-Rich Sewage Sludges during Hydrothermal Treatment and Recovery of Nutrients from Process Water
Journal Article
·
· ACS Sustainable Chemistry & Engineering
- Georgia Inst. of Technology, Atlanta, GA (United States). School of Earth and Atmospheric Sciences
- Georgia Inst. of Technology, Atlanta, GA (United States). School of Earth and Atmospheric Sciences; Changwon National University (Korea)
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
Hydrothermal treatment (HT) is an emerging technique for sustainable sewage sludge management and resource recovery. Many sludges are rich in iron (Fe) due to the common addition of Fe salts in water resource recovery facilities. To develop guidance for reaction conditions targeting nutrient recovery, this study systematically investigated the influence of HT temperature, treatment time, and sludge source on the dynamic speciation evolution of phosphorus (P) and nitrogen (N) during HT of Fe-rich sewage sludge. Complementary chemical extraction and X-ray spectroscopy analyses were conducted to characterize the treatment products. For the sludge mixture (a blend of primary and waste activated sludges), P speciation did not change significantly within 4.5 h at 125 °C HT, while soluble and labile P was converted into insoluble P over time at 175 and 225 °C HT. Strengite (FePO4·2H2O) preferentially formed in the hydrochars with increasing treatment temperature and/or time, whereas 125 °C HT within 1.5 h favored the formation of vivianite (Fe3(PO4)2·8H2O). Organic P was completely decomposed into orthophosphate when the HT temperature reached up to 175 °C. Pyrrole-N was enriched in the hydrochars. Similar reaction pathways were observed during HT of anaerobically digested sludge, though some minor differences in Fe-associated P and organic P were observed. Meanwhile, HT of the two sludges released orthophosphate and ammonia into the process waters at 175 and 225 °C, which can be recovered by a sequential process involving struvite (MgNH4PO4·6H2O) precipitation and air stripping. This study provides new insights into the transformation of P and N during HT of Fe-rich sludges as well as a modular design for maximum P and N recovery from the treatment products.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1813052
- Journal Information:
- ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 31 Vol. 9; ISSN 2168-0485
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
X‐Ray Spectroscopic Quantification of Struvite and Dittmarite Recovered from Wastewater
Effect of water treatment sludge on growth and elemental composition of tomato (Lycopersicon esculentum) shoots
Growth of mono- and mixed cultures of Nannochloropsis salina and Phaeodactylum tricornutum on struvite as a nutrient source
Journal Article
·
Mon Dec 31 19:00:00 EST 2018
· Journal of Environmental Quality
·
OSTI ID:1582083
Effect of water treatment sludge on growth and elemental composition of tomato (Lycopersicon esculentum) shoots
Journal Article
·
Thu Dec 31 23:00:00 EST 1987
· Communications in Soil Science and Plant Analysis; (USA)
·
OSTI ID:5026227
Growth of mono- and mixed cultures of Nannochloropsis salina and Phaeodactylum tricornutum on struvite as a nutrient source
Journal Article
·
Sat Sep 26 00:00:00 EDT 2015
· Bioresource Technology
·
OSTI ID:1339261