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Sodium Lignosulfonate Enhances Humification and Reduces Copper Bioavailability in Sewage Sludge Compost.

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Title: Sodium Lignosulfonate Enhances Humification and Reduces Copper Bioavailability in Sewage Sludge Compost.
Authors: Li, Minghui1 (AUTHOR), Chen, Shangchun1 (AUTHOR), Xu, Genjia1 (AUTHOR), Zhao, Meihua1 (AUTHOR) zmhua@gzhu.edu.cn, Chen, Changya2 (AUTHOR) yuer-17@163.com, Nkinahamira, François1 (AUTHOR)
Source: Water, Air & Soil Pollution. Jun2026, Vol. 237 Issue 11, p1-14. 14p.
Subject Terms: *Humification, *Lignosulfonates, *Composting, *Waste management, *Industrial waste management, *Copper poisoning, *Environmental remediation, *Sludge composting
Abstract: Valorization of industrial by-products like sodium lignosulfonate (SL) offers a sustainable strategy for environmental remediation. This study provides a systematic evaluation of the effects of SL addition on humification and copper (Cu) behavior during municipal sludge composting. The effects of SL addition at 0% (CK), 3% (T3), and 9% (T9) dry weight over a 60-day composting period were investigated. The 9% SL treatment (T9) significantly accelerated compost maturity, achieving a germination index of 96.4% compared to 85.9% in the control. EEM-PARAFAC analysis revealed that SL addition promoted the transformation of protein-like and quinone-like intermediates into stable HA-like substances. Consequently, the final HA content and degree of polymerization in T9 were substantially higher than in the control. Concurrently, enhanced humification was accompanied by a significant reduction in Cu bioavailability. The diethylenetriaminepentaacetic acid-extractable (bioavailable) Cu in T9 was reduced to 96.40 mg/kg, a 66% reduction from its initial value and significantly lower than the 150.73 mg/kg in the final control compost. Pearson analysis confirmed a strong negative correlation between HA content and bioavailable Cu. The findings suggest that SL addition is an effective amendment for producing safer, higher-quality compost, offering a novel strategy for the synergistic valorization of industrial and municipal waste streams. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Description
Abstract:Valorization of industrial by-products like sodium lignosulfonate (SL) offers a sustainable strategy for environmental remediation. This study provides a systematic evaluation of the effects of SL addition on humification and copper (Cu) behavior during municipal sludge composting. The effects of SL addition at 0% (CK), 3% (T3), and 9% (T9) dry weight over a 60-day composting period were investigated. The 9% SL treatment (T9) significantly accelerated compost maturity, achieving a germination index of 96.4% compared to 85.9% in the control. EEM-PARAFAC analysis revealed that SL addition promoted the transformation of protein-like and quinone-like intermediates into stable HA-like substances. Consequently, the final HA content and degree of polymerization in T9 were substantially higher than in the control. Concurrently, enhanced humification was accompanied by a significant reduction in Cu bioavailability. The diethylenetriaminepentaacetic acid-extractable (bioavailable) Cu in T9 was reduced to 96.40 mg/kg, a 66% reduction from its initial value and significantly lower than the 150.73 mg/kg in the final control compost. Pearson analysis confirmed a strong negative correlation between HA content and bioavailable Cu. The findings suggest that SL addition is an effective amendment for producing safer, higher-quality compost, offering a novel strategy for the synergistic valorization of industrial and municipal waste streams. [ABSTRACT FROM AUTHOR]
ISSN:00496979
DOI:10.1007/s11270-026-09352-0