Natural Freezing-Thawing and Its Impact on Dewaterability and Anaerobic Digestibility of Biosludge

MeyerTorsten,; ChenXu,; TranHonghi, N; Grant, AllenD.; Edwards, Elizabeth A.

doi:10.1089/ees.2016.0372

Cited by 13 publications

(6 citation statements)

References 39 publications

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“…They demonstrated that the effect of food waste freezing/defrosting pre-treatment before its anaerobic degradation in the hybrid anaerobic solid-liquid (HASL) system was comparable with the outcomes of food waste heat pre-treatment at a temperature of 150 • C for 1 h, which allowed for the two-fold shortening of the time needed to produce the same amount of methane compared to the anaerobic degradation of fresh food waste [48]. The effect of freezing/defrosting pre-treatment on MF efficiency was also confirmed by Meyer et al (2017), who investigated its effect on the dehydration and anaerobic fermentation of sewage sludge from cellulose-paper factories. They achieved a unitary biogas yield from 111 to 310 cm 3 •g −1 chemical oxygen demand added [53].…”

Section: Resultssupporting

confidence: 52%

“…The effect of freezing/defrosting pre-treatment on MF efficiency was also confirmed by Meyer et al (2017), who investigated its effect on the dehydration and anaerobic fermentation of sewage sludge from cellulose-paper factories. They achieved a unitary biogas yield from 111 to 310 cm 3 •g −1 chemical oxygen demand added [53]. To enable estimating biogas and methane production in the process of mesophilic fermentation aided by LTC-SCDO, a multi-regression method was employed to develop empirical equations.…”

Section: Resultsmentioning

confidence: 79%

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Effect of Low-Temperature Conditioning of Excess Dairy Sewage Sludge with the Use of Solidified Carbon Dioxide on the Efficiency of Methane Fermentation

2020

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This study aimed to determine the effect of the low-temperature conditioning of excess dairy sewage sludge using solidified carbon dioxide on the efficiency of methane fermentation. An increase in the solidified carbon dioxide to excess dairy sewage sludge volumetric ratio above 0.3 had no significant effect on chemical oxygen demand concentration in the dissolved phase. The highest chemical oxygen demand values, ranging from 490.6 ± 12.9 to 510.5 ± 28.5 mg·dm−3, were determined at solidified carbon dioxide to excess dairy sewage sludge ratio ranging from 0.3 to 0.5. The low-temperature conditioning caused ammonia nitrogen concentration to increase from 155.2 ± 10.2 to 185.9 ± 11.1 mg·dm−3 and orthophosphates concentration to increase from 198.5 ± 23.1 to 300.6 ± 35.9 mg·dm−3 in the dissolved phase. The highest unitary amount of biogas, reaching 630.2 ± 45.5 cm3·g o.d.m.−1, was produced in the variant with the solidified carbon dioxide to excess dairy sewage sludge volumetric ratio of 0.3. Methane content of the biogas produced was at 68.7 ± 1.5%. Increased solidified carbon dioxide dose did not lead to any significant changes in biogas and methane production. The efficiency of biogas production from unconditioned excess dairy sewage sludge was lower by 43.0 ± 3.2%. The analysis demonstrated that the low-temperature conditioning is an energetic viable technology aiding the methane fermentation process.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 79%

Effect of Low-Temperature Conditioning of Excess Dairy Sewage Sludge with the Use of Solidified Carbon Dioxide on the Efficiency of Methane Fermentation

2020

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“…Biosludge dewatering is a challenging process [3,4] for several reasons, including the complex gel-like matrix of extracellular polymeric substances, highly charged particles, etc. [5,6] Pulp and paper mills in Canada produce 1.7 million tons (dry solids) of combined primary sludge and biosludge annually [7] and this is expected to increase in the future. This results in a higher cost of sludge management that accounts for as much as 60% of the total waste treatment cost.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of biosludge dewatering using proteins through dual conditioning

et al. 2022

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In pulp and paper mills, effective biosludge dewatering is essential in wastewater treatment to reduce the large volume of biosludge that needs to be treated and disposed. The dewatering process normally requires the use of polymers from petroleum-based sources. This study explores the potential of using cationic proteins such as protamine for biosludge dewatering through dual conditioning with a small amount of a synthetic anionic polymer such as anionic polyacrylamide (APAM). The results show that dual conditioning provides substantial synergistic enhancements in dewatering. The maximum cake solids content of biosludge achieved by adding protamine (7.5%) alone was 12%. By dual conditioning with a small amount of APAM (0.1%), not only the cake solids content was increased to 16%, but also the amount of protamine addition was substantially lowered to 2%.

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“…In previous research, various methods have been employed to enhance WAS dewaterability, including thermal treatment [9], freezing treatment [10], acid treatment [11], alkaline treatment [12], ultrasonic treatment [13], Fenton treatment [14], electrochemistry treatment [15] and, in addition, skeleton builders [16]. Recently, advanced oxidation processes (AOPs), based on sulfate radicals (•SO 4 2− ), have been one of the main focuses of research, thanks to its security and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

Liao

Chen

et al. 2021

Sustainability

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Phosphorus is a nonrenewable and irreplaceable limited resource, and over 90% of phosphorus in influenttransfers into sludge in wastewater treatment plants. In this study, thermally activated peroxydisulfate (TAP) treatment was combined with struvite precipitation to enhance waste activated sludge (WAS) dewaterability and phosphorus recovery. TAP simultaneously enhanced dewaterability and solubilization of WAS. The optimal conditions of TAP treatment were PDS dosage 2.0 mmol/g TSS, 80 °C, pH 4.0~7.0 and 40 min, which enhanced dewaterability (capillary suction time (CST) from 94.2 s to 28.5 s) and solubilization (PO43−-P 177.71 mg/L, NH4+-N 287.22 mg/L and SCOD 10754 mg/L). Radical oxidation disintegrated tightly bound extracellular polymeric substances (TB-EPS) and further released bound water. The acidification effect neutralized the negative surface charge of colloid particles. Compared with thermal hydrolysis, TAP effectively promoted the release of PO43−, NH4+ and SCOD. Cation exchange removed most Ca and Al of the TAP treated supernatant. The optimal conditions of struvite precipitation were Mg/P 1.4 and pH 10.0, which achieved phosphorus recovery of 95.06% and struvite purity of 94.94%. The income obtained by struvite adequately covers the cost of struvite precipitation and the cost of WAS treatment is acceptable.

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Natural Freezing-Thawing and Its Impact on Dewaterability and Anaerobic Digestibility of Biosludge

Cited by 13 publications

References 39 publications

Effect of Low-Temperature Conditioning of Excess Dairy Sewage Sludge with the Use of Solidified Carbon Dioxide on the Efficiency of Methane Fermentation

Effect of Low-Temperature Conditioning of Excess Dairy Sewage Sludge with the Use of Solidified Carbon Dioxide on the Efficiency of Methane Fermentation

Enhancement of biosludge dewatering using proteins through dual conditioning

Enhancing Phosphorus Recovery and Dewaterability of Waste Activated Sludge for Combined Effect of Thermally Activated Peroxydisulfate and Struvite Precipitation

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