Purification of high strength wastewater originating from bioethanol production with simultaneous biogas production

Qiu, Chunsheng; Jia, Xiaoqiang; Wen, Jianping

doi:10.1007/s11274-011-0746-y

Cited by 12 publications

(10 citation statements)

References 33 publications

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“…As the biodegradability of wastewater from 2G biorefineries could be compromised by inhibitors added (e.g., ammonia) or generated during the pretreatment process (e.g., furans, carboxylic acids, and aldehydes), , it is important to evaluate its implications on biorefinery sustainability. Due to the reduction in organic degradation and biogas production, both MPSP and GWP increased with decreasing f D (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…However, due to the generation of biogas and the low electricity consumption, all biorefineries�regardless of their annual COD load�had a negative COD management GWP, confirming the previously discussed trend that the new design had lower GWPs than the no WWT design. As the biodegradability of wastewater from 2G biorefineries could be compromised by inhibitors added (e.g., ammonia) or generated during the pretreatment process (e.g., furans, carboxylic acids, and aldehydes), 6,66 it is important to evaluate its implications on biorefinery sustainability. Due to the reduction in organic degradation and biogas production, both MPSP and GWP increased with decreasing f D (Figure 6).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…These wastewaters cannot be effectively and economically treated by conventional, low-rate (as in organic loading rates) anaerobic–aerobic systems characterized by small substrate-to-biomass ratio, creating significant challenges for the water industry . On the other hand, the rich organics in these wastewaters represent a largely untapped resource of chemical energy that can potentially be recovered as valuable products (e.g., biogas, , medium-chain fatty acids). In particular, wastewater from biorefineries (refineries that convert biomass to energy and/or other valuable products) is characterized by high organic content with chemical oxygen demand (COD) being hundreds or thousands of times of that of municipal wastewater, , but existing practices in managing this wastewater often raise safety concerns and can require high energy usage.…”

Section: Introductionmentioning

confidence: 99%

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Design of a High-Rate Wastewater Treatment Process for Energy and Water Recovery at Biorefineries

Kontos

Cabrera

et al. 2023

ACS Sustainable Chem. Eng.

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Industrial wastewaters rich in organic carbon have potential for value generation, but conventional, low-rate, anaerobic–aerobic wastewater treatment (WWT) processes often incur significant capital expenses and energy consumption. In this study, we leveraged experimental data for biorefinery-derived wastewaters to characterize the implications of transitioning from a conventional, low-rate process to a high-rate, multistage anaerobic process. We designed and simulated these WWT processes across seven first- and second-generation (1G/2G) biorefineries and evaluated the implications for biorefinery sustainability through techno-economic analysis (TEA) and life cycle assessment (LCA). Compared to the conventional design, the new process can substantially reduce capital costs and electricity usage. These improvements were particularly evident for 2G biorefineries, translating to 5%–13% lower minimum product selling prices (MPSPs) and 7%–135% lower 100-year global warming potentials (GWPs; the 135% reduction is due to the transition of one biorefinery from net emission [0.87 kg of CO2e·gal–1] to net sequestration [−0.31 kg of CO2e·gal–1]). Biorefineries could further reduce the MPSP through the renewable identification number (RIN) credits by upgrading and selling the biogas as renewable natural gas, but at the expense of increasing GWP. When normalized, the COD management cost ranged from $–56 to $465 per tonne of COD, indicating that wastewater could be a net source of revenue for some biorefineries.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of a High-Rate Wastewater Treatment Process for Energy and Water Recovery at Biorefineries

Kontos

Cabrera

et al. 2023

ACS Sustainable Chem. Eng.

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“…As compared to molasses‐based first‐generation (1G) ethanol production, where no pretreatment step is involved and wastewater is generated only from the fermentation stage, the 2G ethanol process is likely to generate large quantities (~10× ethanol volume) of high‐strength complex wastewaters from pretreatment, hydrolysis and fermentation–distillation stages 3 . However, existing research has reported the characterization and treatment of only 2G ethanol fermentation residues/wastewaters 4‐8 and no studies were found on treatment of wastewater fractions emerging from the pretreatment stage.…”

Section: Introductionmentioning

confidence: 99%

“…have determined that the application of ozonation for distillery wastewater favorably enhanced methane production and cumulative gas volumes. Studies have reported COD reduction up to 75% via anaerobic digestion, whereas the use of AOP pretreatment has been reported to improve COD reduction and color removal by up to 90% 6,8 …”

Section: Introductionmentioning

confidence: 99%

Effect of ozonation on biodegradability enhancement and biomethanation potential of pretreatment process wastewaters from 2G ethanol production

Sreevathsan

Crasta

Bhavana

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND The production of second‐generation (2G) ethanol from lignocellulosic biomass generates large quantities of high‐strength complex wastewaters from various stages of the process. An effective pretreatment is necessary in order to overcome the low biodegradability of these wastewaters for further biomethane recovery. The present study reports the effect of ozonation on the biodegradability enhancement and biomethanation potential of complex 2G ethanol pretreatment process wastewaters, from acid (H2SO4) and alkali (NaOH) pretreatment process. RESULTS Ozonation (9.33 g m−3) was performed for both acid and alkali pretreatment wastewaters at a flow rate of 10 L min−1 for 1 h. Ozonation of both wastewaters increased biodegradability index (BI) up to 36% along with minimal chemical oxygen demand (COD; 7 ± 3%), color (10 ± 4%), and toxicity (22.5 ± 7.5%) reduction. Biomethane potential tests were carried out for the control and ozonated wastewaters having BI > 0.4. The acid‐pretreatment wastewater indicated poor biomethanation potential due to high presence of sulfates (COD/SO4 ~ 3.0). However, ozonation of alkali‐pretreatment wastewater facilitated up to twofold enhancement in the cumulative methane volume, while the enhancement in the rate of methane production was found to be up to 47%. Fourier transform infrared spectroscopic analysis of control and ozonated wastewaters revealed the breakdown of complex organic molecules and aromatics to readily biodegradable intermediates. The kinetics of methane generation could be predicted by the modified Gompertz model. CONCLUSION The study demonstrated the efficacy of ozonation as an effective pretreatment option to facilitate biodegradability enhancement of 2G ethanol pretreatment process wastewaters. The enhancement in biodegradability was observed to enable subsequent biogas recovery via anaerobic digestion along with COD removal. © 2023 Society of Chemical Industry (SCI).

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Purification of high ammonia wastewater in a biofilm airlift loop bioreactor with microbial communities analysis

Qiu

Zhang

Sun

et al. 2014

World J Microbiol Biotechnol

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A 70 m(3) gas-liquid-solid three-phase flow airlift loop bioreactor, in which biofilm attached on granular active carbon carriers, was used for purification of the high ammonia wastewater from bioethanol production. Under the optimum operating conditions, COD and NH4 (+)-N average removal rate of 89.0 and 98.6 % were obtained at hydraulic retention time of 10 h. Scanning electron microscopy was applied for observation of the biofilm formation. High contaminants removal efficiency was achieved by holding high biomass concentration in the reactor due to the attached biofilm over the carriers. The 16S rRNA gene clone library analysis indicated that 68.6 % of the clones were affiliated with the two phyla Bacteroidetes and Proteobacteria, and residual clones clustered with various sequences from uncultured bacteria. The presence of various anoxic/anaerobic bacteria indicated that the oxygen gradient inside the biofilm could provide appropriate micro-environment for nitrogen removal through simultaneous nitrification and denitrification.

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Purification of high strength wastewater originating from bioethanol production with simultaneous biogas production

Cited by 12 publications

References 33 publications

Design of a High-Rate Wastewater Treatment Process for Energy and Water Recovery at Biorefineries

Design of a High-Rate Wastewater Treatment Process for Energy and Water Recovery at Biorefineries

Effect of ozonation on biodegradability enhancement and biomethanation potential of pretreatment process wastewaters from 2G ethanol production

Purification of high ammonia wastewater in a biofilm airlift loop bioreactor with microbial communities analysis

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