Synergy of combined free nitrous acid and Fenton technology in enhancing anaerobic digestion of actual sewage waste activated sludge

Karimi, Razieh; Hallaji, Seyed Mostafa; Siami, Salar; Torabian, Ali; Aminzadeh, Behnoush; Eshtiaghi, Nicky; Zahedi, S.

doi:10.1038/s41598-020-62008-9

Cited by 10 publications

(5 citation statements)

References 39 publications

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“…To evaluate the biomethane produced per kg of organic matter added, SMP was also evaluated in each batch, the evolution of which is shown in Figure 2b. Although there are no SMP data available in the literature on the triple AcoD of SS:WDW:CM for the sake of comparison, the results (200− 230 L CH 4 /kg VS) appear to be appropriate as they are in line with previous studies on AD of SS (between 200 and 250) 26,28,40 and CM (230−260 L CH 4 /kg VS) 5,41 and AcoD of SS:WDW (230 L CH 4 /kg VS). 18 According to Figure 2b, a slight increase (7−16%) can be observed when CM was used as a cosubstrate.…”

Section: Methodssupporting

confidence: 69%

“…The characteristics of the raw cosubstrates are shown in Table and fall within the usual range reported in the literature. ,, …”

Section: Resultsmentioning

confidence: 60%

“…The characteristics of the raw cosubstrates are shown in Table 1 and fall within the usual range reported in the literature. 4,18,28 Table 2 shows the average values of the parameters at the beginning and end of the BMP tests. TCOD, TS, and VS NSCOD is estimated by subtracting the SCOD from the TCOD.…”

Section: Methodsmentioning

confidence: 99%

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Evaluating the Effectiveness of Adding Chicken Manure in the Anaerobic Mesophilic Codigestion of Sewage Sludge and Wine Distillery Wastewater: Kinetic Modeling and Economic Approach

et al. 2020

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Anaerobic digestion (AD) has been extensively investigated to obtain energy from chicken manure (CM). However, CM has high total and volatile solids (TS and VS) contents, making wet AD unsuitable for treatment due to high levels of water consumption and large digester volumes. Previous studies have shown that anaerobic codigestion (AcoD) of sewage sludge and wine distillery wastewater (SS:WDW) resulted in lower methane production (MP) values than those obtained in AD of SS alone due to the lower VS content of the WDW. The present study was carried out to address these challenges. AcoD of SS:WDW:CM is proposed here for the first time as an effective new alternative for managing three wastes in one and the same digester. To achieve this goal, different proportions of SS:WDW:CM (50:50:0; 49:49:2; 47:47:6; 44:44:12 w/w/w) were considered. Increasing the proportion of CM resulted in an increase both in MP (from 3.3 to 11.5 L CH 4 /L reactor) and SMP (from 197 to 229 L CH 4 /kg VS), along with high organic matter removal rates (% TCOD r = 60 ± 3% and % VS r = 64 ± 3%). However, it also resulted in a reduced methane rate (from 0.116 to 0.045 d −1 ) and a longer lag phase (from 0.394 to 3.199 d) due to the high amount of nonsoluble organic matter in the CM. Optimal conditions were 44:44:12 (w/w/w) SS:WDW:CM, which resulted in removal rates of %VS r = 60%, SMP = 229 L CH 4 /kg VS, MP = 11.5 L CH 4 /L reactor, and methane productivity (at 30 days) = 0.38 L CH 4 /L reactor/d.

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Section: Methodssupporting

confidence: 69%

“…The characteristics of the raw cosubstrates are shown in Table and fall within the usual range reported in the literature. ,, …”

Section: Resultsmentioning

confidence: 60%

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Evaluating the Effectiveness of Adding Chicken Manure in the Anaerobic Mesophilic Codigestion of Sewage Sludge and Wine Distillery Wastewater: Kinetic Modeling and Economic Approach

et al. 2020

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“…A combination of 2.5 mg N/L FNA, 50 mg H2O2/g TS and 0.0067 g Fe + /g H2O2 was retained for a total of 6 hours (5 hours for FNA at pH 5.5, 1 hour Fenton at pH 3) and increased the fraction of rBOM in mixed sewage sludge by more than 113% times compared to the sole FNA treatment and 87% more than the sole Fenton treatment (Karimi et al, 2020). Methane production from the pretreated sludge was 69% more than obtained from the untreated sludge.…”

Section: Free Nitrous Acid Treatment In Water Resource Recovery Facil...mentioning

confidence: 99%

Anaerobic Process Intensification With Vacuum and Combined Pretreatment Technologies

Okoye

2024

Preprint

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Anaerobic digestion and fermentation are essential processes for transforming wastewater treatment plants into robust energy, nutrient, and water recovery facilities. However, these processes' slow microbial growth rate and low yields limit their application to larger facilities. To improve their efficiency, intensifying anaerobic digestion and fermentation (to a lesser extent) has been the subject of numerous research studies. This dissertation explored the principle of vacuum evaporation for combining sludge thickening, decoupling of hydraulic and retention times, and nutrient recovery into a single treatment unit. Gaps, including the efficiency of vacuum sludge thickening at different solids content, its impact on anaerobic bacteria and the overall physio and biochemical processes, were investigated. In batch fermentation, establishing 400 mbar of absolute pressure led to 49% solubilization of primary sludge in 72 hours compared to the conventional fermentation in which 11% solubilization was achieved. During fermentation of TWAS at 400 mbar, deterioration of solubilization and VFA yield was observed. The vacuum technology was used to decouple the hydraulic and solids retention time (HRT/SRT) in semi-continuous fermentation of mixed sludge. At SRT of 3 days and HRT of 1.5 days, the vacuum-assisted fermenter yielded 660 mg sCOD/g VSS compared to the conventional fermenter which achieved 513 mg sCOD/g VSS with equal HRT and SRT of 3 days. Additionally, 50% of the ammonia produced in the fermenter was extracted in the condensate with no chemical alterations. The results led to the development of IntensiCarb, a patent-pending technology that combines sludge thickening, digestion, and dewatering into a single unit. This dissertation also investigated the use of combined chemical-mechanical and chemical-chemical pretreatment technologies with free nitrous acid (FNA) to enhance the anaerobic digestion of TWAS. FNA is an environment-friendly chemical that can be produced in wastewater treatment facilities. In this study, FNA concentrations from 0.7 to 2.8 mg HNO2-N/L were combined with ultrasonication energy input from 600 to 3,000 kj/kg TS to explore the feasibility of lower energy input for effective sludge disintegration and enhanced anaerobic digestion. The energy input for ultrasonication could be halved from 3,000 kj/kg TS to 1,500 kj/kg TS by adding 2.8 mg HNO2-N /L while improving solubilization by 43% and methane yield by 18%. FNA was also combined with hydrogen peroxide, an oxidizing chemical that has shown effectiveness in improving biodegradability at low pH. The results showed that the pretreatment combination with the lowest chemical concentrations of 0.7 mg HNO2-N /L and 25 mg H2O2/g TS was the most effective for maximizing methane yield, increasing it by 50% compared to the untreated TWAS.

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“…Wang et al (2018) concluded that FNA induces the permeabilization of bacteria and may lead to cell membrane lysis [2]. Despite the lack of a complete understanding of the mechanism, many studies have proven the effectiveness of NO 2 /FNA as a WAS disintegration agent in terms of soluble chemical oxygen demand (SCOD) release, and consequently for increased methane production [12][13][14]. Ma et al showed that FNA pretreatment of WAS (concentrations up to 2 mgN-HNO 2 /L) enhanced the exploitation of internal carbon sources during the simultaneous fermentation denitrification process.…”

Section: Introductionmentioning

confidence: 99%

Disintegrated Waste-Activated Sludge (NO2/FNA Method) as a Source of Carbon for Denitrification in the Mainstream of a WWTP

Szypulska,

Janiak,

Zięba

et al. 2024

Resources

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The deficiency of readily biodegradable organic carbon can be a significant limitation to effective nitrogen removal during wastewater denitrification. Waste-activated sludge (WAS) is a source of carbon produced directly at wastewater treatment plants (WWTPs). Raw WAS has a large molecular weight and complex chemical structure molecules that are not easily available for microorganisms. In this study, easily biodegradable organic fractions were released using pH control and/or nitrites and nitric acid (NO2/FNA). The obtained results indicated that WAS can be a sufficient carbon source for denitrification in WWTPs that are at risk of minor effluent violations. The implementation of WAS disintegration with the use of pH control and NO2/FNA allowed for the denitrification of an additional 0.5 and 0.8 mgN-NO3/L. WAS disintegration, besides being a source of carbon generation, reduces the volume of sludge and leads to the implementation of a closed-loop system.

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Synergy of combined free nitrous acid and Fenton technology in enhancing anaerobic digestion of actual sewage waste activated sludge

Cited by 10 publications

References 39 publications

Evaluating the Effectiveness of Adding Chicken Manure in the Anaerobic Mesophilic Codigestion of Sewage Sludge and Wine Distillery Wastewater: Kinetic Modeling and Economic Approach

Evaluating the Effectiveness of Adding Chicken Manure in the Anaerobic Mesophilic Codigestion of Sewage Sludge and Wine Distillery Wastewater: Kinetic Modeling and Economic Approach

Anaerobic Process Intensification With Vacuum and Combined Pretreatment Technologies

Disintegrated Waste-Activated Sludge (NO2/FNA Method) as a Source of Carbon for Denitrification in the Mainstream of a WWTP

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