Study on process characteristics of coagulation-dynamic adsorption for carbon source and phosphorus source from domestic wastewater

ZHAO Zicheng; ZHOU Ke; CHEN Rong

doi:10.13205/j.hjgc.202509014

Volume 43 Issue 9

Sep. 2025

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ZHAO Zicheng, ZHOU Ke, CHEN Rong. Study on process characteristics of coagulation-dynamic adsorption for carbon source and phosphorus source from domestic wastewater[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 127-138. doi: 10.13205/j.hjgc.202509014

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ZHAO Zicheng, ZHOU Ke, CHEN Rong. Study on process characteristics of coagulation-dynamic adsorption for carbon source and phosphorus source from domestic wastewater[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(9): 127-138. doi: 10.13205/j.hjgc.202509014

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Study on process characteristics of coagulation-dynamic adsorption for carbon source and phosphorus source from domestic wastewater

doi: 10.13205/j.hjgc.202509014

ZHAO Zicheng^1,2,
ZHOU Ke²,
CHEN Rong^{2
,
,}

1. School of Resources Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Key Laboratory of Northwest Ministry of Water Resources, Environment and Ecology, Xi'an University of Architecture and Technology, Xi'an 710055, China

Received Date: 2025-02-14
Available Online: 2025-11-05
Publish Date: 2025-09-01

Abstract

Abstract

Domestic wastewater， characterized by its substantial discharge volume and resource recovery potential， holds significant importance for energy recovery through the concentration of organic matter. Currently， coagulation-sedimentation stands as the predominant method for wastewater concentration. This study investigated coagulation process optimization using wastewater from the treatment plant of Xi'an Siyuan University， focusing on the impacts of coagulant type （FeCl₃·6H₂O vs. PAC）， dosage （30~500 mg/L）， sedimentation time （15~120 min）， and initial pH （3~8） on carbon source capture and phosphorus enrichment. A subsequent dynamic biochar adsorption column （45 cm height， 4 mL/min flow rate） was employed to further treat coagulated effluent， achieving compliance with Class 1A in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant ［ρ（COD） < 50 mg/L， ρ（NH₄⁺-N） < 5 mg/L］. Ultrasonic-assisted desorption-regeneration cycles （0.5 mol/L HCl， 30°C， 75 min ultrasonication） enhanced desorption efficiency while enabling closed-loop resource recovery through the reuse of HCl for pH adjustment.Key findings include：Optimal coagulation at 300 mg/L FeCl₃·6H₂O， 30 min sedimentation， and pH value of 6， achieved 67.76% COD capture and >98% TP/PO₄^3--P enrichment. Modified corncob biochar maintained >50% COD/NH₄⁺-N adsorption capacity after 5 regeneration cycles. Ultrasonic desorption boosted COD/NH₄⁺-N desorption rates to （94.65±0.01）% and （94.25±0.05）%， respectively， with process duration reduced by 83.3% to 92.2% versus the conventional methods.This integrated strategy provides a scientifically validated solution for simultaneous wastewater purification and resource recovery， aligning with circular economy principles in municipal wastewater treatment.
- coagulation method,
- dynamic adsorption column,
- carbon and phosphorus capture,
- ultrasonic-assisted,
- recycling

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References(41)

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