Evaluation of the dewaterability, heavy metal toxicity and phytotoxicity of sewage sludge in different advanced oxidation processes

Liang, Jialin; Zhang, Liang; Ye, Maoyou; Guan, Zhijie; Huang, Jinjia; Liu, Jingyong; Li, Lei; Huang, Shaosong; Sun, Shuiyu

doi:10.1016/j.jclepro.2020.121839

Cited by 45 publications

(12 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4f), indicating a general lower water solubility of these elements and potentially reduced environmental risk due to a decreased HMs leaching potential. This was also reported in several solid fractions of sewage sludge coagulated/flocculated with different chemicals because of metallic cations fixation [50,51]. However, the lower solubility of Cu and Zn, which can be considered as plant micronutrients, together with the lower P leachability suggest a decreased fertilizing efficiency of chemically treated solid fractions.…”

Section: Fertilizing Potential Leachability Of Hms and Phytotoxicity Of Treated Solid Fractionsmentioning

confidence: 58%

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Beggio

Peng

Lü

et al. 2021

Waste Biomass Valor

View full text Add to dashboard Cite

Chemically enhanced solid–liquid separation (CES) of digestate can improve its membrane filterability but potentially influence the environmental features of the separated solid fraction, thus hindering its possible agricultural reuse. In this study, the effects were assessed of different dosages of polyaluminum chloride (PAC), epichlorohydrine-dimethylamine with ethylendiamine (DEED) and polyacrilamides (PAM) on CES of digestate from biowaste in terms of Total Suspended Solid (TSS) mitigation in the liquid fractions and resulting environmental quality of the solid fractions. Results from lab-scale trials showed that applied chemicals significantly increased the centrifugation efficiency with achieving minimum TSS concentration of 2347 ± 281 mgTSS/L (up to 90% improved TSS mitigation). Also, performed treatments led to almost complete removal of P and Heavy Metals (HMs) from the liquid fractions after centrifugation. Conditioned solid fractions showed higher Al (reaching 20 g kg−1 TS), organic carbon and nitrogen content (up to 324 mgTOC kg−1 TS and 44.1 mgTKN kg−1 TS, respectively) due to residual PAC, DEED and PAM. However, achieved concentrations of HMs guaranteed full consistency with EU regulation limits established for agricultural reuse of organic soil amendments. Further, leaching tests performed on the treated solid fractions indicate higher chlorides and soluble Al concentrations in the water extracts (up to 4.6 g L−1 and 2.3 g L−1, respectively), but lower HMs leachability from the digestates undergone CES. Nevertheless, water extracts from treated biosolids were characterized by higher phytotoxicity, likely related with direct Al toxicity and increased salinity due to chemicals addition. Accordingly, the effects on soil–plant system should be better investigated when agricultural reuse of CES-treated solid fraction of digestate is foreseen. Graphic abstract

show abstract

Section: Fertilizing Potential Leachability Of Hms and Phytotoxicity Of Treated Solid Fractionsmentioning

confidence: 58%

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Beggio

Peng

Lü

et al. 2021

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…This results indicated that the oxidation of activated PPS induced charge neutralization. This might due to that the oxidation process disrupted flocs and reduced the amount of negatively charged organic matter, such as protein in EPSs, besides, the positive ion would reduce the electro-static repulsion of flocs, leading to charge neutralization (Wang et al 2018a;Liang et al 2020). Specially, when dosing 1.0 mmol/gDS PPS and 0.5 mmol/ gDS Fe(II), zeta potential changed from negative to positive, reached 0.53 mv.…”

Section: The Migration Of Organic Substancesmentioning

confidence: 99%

Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

Guo

Long

Huang

et al. 2021

Water Science and Technology

View full text Add to dashboard Cite

The effects of thermally and Fe(II) activated potassium persulfate (PPS) on sludge dewatering performance were compared systematacially. Sludge dewaterability was monitored by measuring capillary suction time (CST) and sludge specific resistance to filtration (SRF), and the degradation effect was characterized by Chemical oxygen demand (COD), total organic carbon (TOC), ammonia nitrogen (NH4+-N) and extracellular polymeric substances (EPS). The Change of extracellular polymer substance (EPS) including soluble, loosely bound and tightly bound EPS (S-EPS, LB-EPS and TB-EPS) with time and PPS dosage was monitored to discuss the oxidation efficiency of thermally and Fe(II) activated PPS. Sludge supernate were analyzed by three dimensional fluorescence excitation-emission spectrum (3D-EEM) to confirm the proteins transformation. The result showed that sludge dewaterability in terms of CST and SRF were enhanced with increasing PPS dosage and condition time of both two activated methods. While Fe(II) activated PPS could reduce sludge CST and SRF to preferred values at low PPS dosage and short condition time. Maenwhile, sludge degradation effect was also more obvious. Mechanically, sludge TB-EPS in proteins and polysaccharides converted to SB-EPS was more quickly with Fe(II) activated PPS. Besides, thermally activated PPS tended to oxidize the protein in the supernatant first.

show abstract

“…4 Surface water is considered to be the major environmental reservoir for PFCs, 5 because the surface water is a final sink for most PFCs. However, the presence of PFCs was determined also in groundwater, 8 sediment, 9,10 sludge samples, 11 agricultural plants, 12 food commodities, 13,14 and even in the human body. 5 Moreover, it is found that in every 20 children tested 19 had blood contaminated with PFOA which is extremely alarming.…”

Section: Introductionmentioning

confidence: 99%

Temporal trend of perfluorinated compounds in untreated wastewater and surface water in the middle part of the Danube River belonging to the northern part of Serbia

et al. 2022

View full text Add to dashboard Cite

The occurrence and temporal variation of selected priority substances and contaminants of emerging concerns, i.e. eleven perfluorinated compounds (PFCs) (belonging to perfluorosulphonates, perfluorocarboxylic acids, and perfluorinated sulphonamides) have been investigated in composite surface water samples of the Danube River at the upstream and downstream locations from the discharge point of wastewater. Among the analyzed compounds, six PFCs (PFOA, PFOS, PFHxA, PFNA, PFDA and PFUnA) were quantified. Overall, the detection frequency for most quantified compounds was very high (>90 %), only PFDA and PFUnA were quantified with less frequency, 33 and 67 %, respectively. The highest quantified concentrations of PFOA and PFOS were 14.9 ng/L (average 12.1 ng/L) and 14.2 ng/L (average 6.11 ng/L), respecttively. These ones together with PFHxA (average 10.0 ng/L) were quantified at the highest concentrations in comparison to the other investigated compounds. However, the determined levels of PFOS during investigated sampling period for all samples analyzed were always lower than the maximum allowable concentration set for inland river waters but were always higher than the environmental quality standard threshold value-AA-EQS of 0.65 ng/L sets by the Directive of European Parliament. Moreover, the levels of PFOA were always several times lower than the set AA-EQS value.

show abstract

Evaluation of the dewaterability, heavy metal toxicity and phytotoxicity of sewage sludge in different advanced oxidation processes

Cited by 45 publications

References 52 publications

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Chemically Enhanced Solid–Liquid Separation of Digestate: Suspended Solids Removal and Effects on Environmental Quality of Separated Fractions

Insight into the comparison of thermally and Fe(II) activated persulfate on sludge dewaterability and disintegration

Temporal trend of perfluorinated compounds in untreated wastewater and surface water in the middle part of the Danube River belonging to the northern part of Serbia

Contact Info

Product

Resources

About