Continuous-flow aerobic co-treatment of municipal sludge derived hydrothermal liquefaction aqueous phase with wastewater in treatment plants
Bibliographic record
Abstract
Aerobic treatment of hydrothermal liquefaction (HTL) aqueous phase from municipal sludge is a potential on-site treatment option that could help overcome a major challenge, effectively managing HTL aqueous phase. In this study, HTL aqueous phase, derived from mixed sludge cake at 332°C, 16.9 min, was blended with synthetic wastewater in a 1:1000 volumetric ratio representative of sludge processing at a full-scale treatment plant. This mixture was then fed into a bench-scale activated sludge unit, comprised of aeration and settling tanks, under organic loading rates of 1.2–1.6 kg BOD/m 3 ·d. Results revealed that blending HTL aqueous phase into influent wastewater resulted in significant changes in chemical oxygen demand (COD), five-day biochemical oxygen demand (BOD 5 ), total ammonium nitrogen (TAN), PO 4 3- -P, and total phenolics concentrations of influent wastewater. There was no evidence of inhibition on aerobic biomass throughout the testing period. However, significant increases in COD (40–45 %), TAN (10–14 %), PO 4 3- -P (8 %), and total phenolics concentrations (75–87 %) were detected in the treated effluent while the BOD 5 of treated effluent was not affected by HTL aqueous phase blending. Although the sludge volume index of biomass significantly increased after blending HTL aqueous phase into the wastewater, the total suspended solids concentration of the settling underflow and sludge recycle were not affected. Finally, recalcitrant compounds were found to increase the UV 254 absorbance. The techno-economic analysis showed that returning the HTL aqueous phase to the activated sludge process would increase aeration cost by 22.5 %, while overall treatment cost would decrease by 13.5 % through HTL integration. • Aerobic treatment tested for wastewater with sludge-derived HTL aqueous phase. • HTL aqueous phase spiking (1:1000 v/v) significantly changed influent quality. • Treatment was not inhibited by HTL aqueous phase at HRT/SRT: 4.5-h/9-d and 6-h/9-d. • Addition of HTL aqueous phase to wastewater affected effluent quality, except BOD. • Slower settling was observed in system fed with HTL aqueous phase mixed wastewater.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".