Free nitrous acid pretreatment of sludge to achieve nitritation: The effect of sludge concentration

Wang, Zenghua; Wang, Bo; Gong, Xuzhong; Qiao, Xin; Peng, Yongzhen

doi:10.1016/j.biortech.2019.121358

Cited by 16 publications

(6 citation statements)

References 35 publications

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“…1). Similar results have been reported by others as well (Wang, 2016;Wang et al, 2019). Acidic pretreatment could effectively cause the cell death due to dehydration; however, it is not e cient for breaking cell membrane.…”

Section: Resultssupporting

confidence: 89%

Pretreatments for Enhancing Sewage Sludge Reduction and Reuse in Lipid Production

Chen

Zhang

et al. 2020

Preprint

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Background: Converting wastewater sludge for lipid is considered as one of the best strategies of sludge management. The current problem of lipid production from sludge is the low yield due to the low availability of easily uptaken materials in sludge. Pretreatments are efficient methods to improve sludge bioavailability. Results: In this study, it was observed that the soluable chemical oxygen demand (SCOD) had significantly increased after different pretreatment.The SCOD in the supernatant was increased from 32.64±5.19 to 180±13 mg/L, 924±17 mg/L, 1030±6 mg/L and 3708±22 mg/L after acidic, alkaline, microwave irradiation and ultrasonication pretreatment, respectively. Pretreatments have also increased the release in total nitrogen (TN) and total phosphorus (TP) from solids. The sludge after different pretreatments were used as medium for lipid production, thighest lipid content (36.67% g/g) was obtained in the fermentation with ultrasonication pretreatment sludge, and the sludge reduction was 63.10%.Conclusion: It was found that ultrasonication pretreatment was the most efficient way to increase the sludge biodegradability (SCOD), to release TN and TP from solid phase to liquid phase. Pretreated sludge for lipid production achieved significant improvement lipid yield and sludge reduction. Lipids produced from pretreated sludge was transesterified to biodiesel and the analysis showed that the biodiesel had similar composition as commercial biodiesel. The study reveals that pretreatment on sludge is a promising method for enhancing biological sludge management efficiency.

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Section: Resultssupporting

confidence: 89%

Pretreatments for Enhancing Sewage Sludge Reduction and Reuse in Lipid Production

Chen

Zhang

et al. 2020

Preprint

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“…In addition, the activated sludge concentrations might influence NOB suppression. It was recently revealed that FNA inactivation of NOB became less effective with higher sludge concentrations, at relatively low FNA concentrations (<0.77 mgN/L)(Wang et al 2019). It should also be noted that the starvation of activated sludge could facilitate the NOB resistance to FNA treatment.…”

mentioning

confidence: 99%

Improving wastewater management using free nitrous acid (FNA)

et al. 2020

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“…1 ). It has also been reported that the acidic treatment did not significantly impact the TN concentration in the liquid portion (only 8% increase of the TN concentration after treatment) [ 47 , 49 , 50 ]. Acidic pretreatment could effectively cause cell death due to dehydration; however, it is not efficient for breaking cell membranes [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…Physical, chemical, and biological pretreatments were investigated to release nutrients from sewage sludge and were observed to highly assist the utilization of sludge by microorganisms [ 3 ]. So far, the impact of sludge pretreatment on methane and hydrogen production has been widely performed [ 10 , 25 , 27 , 32 , 47 , 50 , 64 ], however, few have evaluated its impact on lipid production [ 25 , 27 , 42 ]. Due to the concern of high cost, difficult management, and low stability, the full-scale application of biological pretreatments is scarce [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

Chen

Zhang

et al. 2020

Biotechnol Biofuels

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Background Converting wastewater sludge to lipid is considered as one of the best strategies of sludge management. The current problem of lipid production from wastewater sludge is the low yield (0.10–0.16 g lipid/g dry sludge) due to the low availability of easily uptaken materials (such as soluble monosaccharide and oligosaccharide) in sludge to oleaginous microorganism (Rhodotorula glutinis, Trichosporon oleaginosus, Lipomyces starkeyi). Pretreatments are efficient methods to improve sludge bioavailability. This study is aimed to achieve high lipid production from sludge and high sludge reduction. Results In this study, it was observed that the soluble chemical oxygen demand (SCOD) had significantly increased after different pretreatment. The SCOD in the supernatant was increased from 32.64 to 180.25 mg/L, 924.16 mg/L, 1029.89 mg/L and 3708.31 mg/L after acidic (pH 2 for 2 h), alkaline (pH 12 for 2 h), microwave irradiation (15 min with 5 min interval), and ultrasonication (30 min at 450 W and 20 kHz frequency with 5 s on and 2 s off mode) pretreatment, respectively. Pretreatments have also increased the release of total nitrogen (TN) and total phosphorus (TP) from solids. The sludge after different pretreatments were used as a medium for lipid production, and the highest lipid content (36.67% g/g) was obtained in the fermentation with ultrasonication pretreatment sludge, and the sludge reduction was 63.10%. For other pretreatments, the lipid content and sludge reduction were 18.42% and 32.63% in acid pretreatment case, 21.08% and 36.44% in alkaline pretreatment case, and 26.31% and 43.03% in microwave pretreatment case, respectively. Conclusion It was found that ultrasonication pretreatment was the most efficient way to increase the sludge biodegradability (SCOD) and to release TN and TP from solid phase to liquid phase. Pretreated sludge for lipid production achieved significant improvement in lipid yield and sludge reduction. Lipids produced from pretreated sludge were transesterified to biodiesel and the analysis showed that biodiesel had a similar composition as commercial biodiesel. The study reveals that pretreatment on sludge is a promising method for enhancing biological sludge management efficiency.

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Free nitrous acid pretreatment of sludge to achieve nitritation: The effect of sludge concentration

Cited by 16 publications

References 35 publications

Pretreatments for Enhancing Sewage Sludge Reduction and Reuse in Lipid Production

Pretreatments for Enhancing Sewage Sludge Reduction and Reuse in Lipid Production

Improving wastewater management using free nitrous acid (FNA)

Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

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