Improving hydrolysis acidification by limited aeration in the pretreatment of petrochemical wastewater

Wu, Changyong; Zhou, Yuexi; Wang, Peichao; Guo, Shujun

doi:10.1016/j.biortech.2015.06.072

Cited by 74 publications

(11 citation statements)

References 32 publications

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“…The rind and pith contained more sugars than the leaf (as shown in Table 1) but had a more highly lignified structure that caused slightly decreased levels of hemicellulose break-down, so it took longer for the substrates that are readily dissolved or precipitated to degrade, which in turn led to a slightly slower hydrolysis rate, stabilizing after 12 hours. In the acid production stage, the composition of the fermentation end products could affect the stability of the methanogenic stage [30]. In the AH stage, the accumulation of acidic substances is beneficial to the subsequent anaerobic fermentation.…”

Section: Aerobic Hydrolysis Stagementioning

confidence: 99%

“…In the AH stage, the accumulation of acidic substances is beneficial to the subsequent anaerobic fermentation. Figure 2 shows that as the hydrolysis time increased, the concentration of VFAs in hydrolysis liquor increased rapidly in initial 8 h, then In the acid production stage, the composition of the fermentation end products could affect the stability of the methanogenic stage [30]. In the AH stage, the accumulation of acidic substances is beneficial to the subsequent anaerobic fermentation.…”

Section: Aerobic Hydrolysis Stagementioning

confidence: 99%

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Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Zhang

et al. 2019

Energies

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To solve the difficulty of lignocellulose hydrolysis and the formation of crusted scum in anaerobic fermentation, various parts of corn stover, i.e., pith, rind and leaf, were subjected to a two-phase processing including aerobic hydrolysis (AH) and anaerobic fermentation. The results showed that AH significantly broke down the lignin structure of the various components of corn stover and increased the rate of lignin degradation. After 16 h of AH, the lignin degradation rates of the pith, rind and leaf were 4.20%, 3.91% and 4.90%, respectively, and the acetic acid produced accounted for more than 60% of the total amount of volatile fatty acids (VFAs) and ethanol. After hydrolyzing the pith and rind for 12 h and the leaf for 8 h, the maximum methane yields of fresh mass volatile solid (VS) were 323 ml g-1, 251 ml g-1 and 264 ml g-1, respectively, which were increased by 35.02%, 30.05% and 8%, respectively, while the fermentation cycle of T90 (90% of the total gas production) was shortened by 4-5 days. After hydrolyzing the rind and leaf for 12 h and the pith for 16 h, the thicknesses of the scum layer were only 7.1%, 13.6% and 18%, respectively, of that of the untreated group, indicating that AH coupled with anaerobic fermentation can effectively degrade lignin, reduce the thickness of the scum layer and increase the methane yield.

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Section: Aerobic Hydrolysis Stagementioning

confidence: 99%

Section: Aerobic Hydrolysis Stagementioning

confidence: 99%

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Zhang

et al. 2019

Energies

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“…Low H 2 S generation due to SO 4 À reduced reduction can benefit subsequent biological treatment by lowering inhibitory effects. Benzene ring organics', such as benzene, toluene, ethylbenzene, and xylenes, treatability in the biological stage can be improved [11].…”

Section: Chemical Treatmentmentioning

confidence: 99%

Biological Treatment of Petrochemical Wastewater

Ghimire¹,

Wang²

2019

Petroleum Chemicals - Recent Insight

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Petrochemical wastewater is inherent to oil industries. The wastewater contains various organic and inorganic components that need to be well managed before they can be discharged to any receiving waters. The complexity of the wastewater and stringent discharge limit push the development of wastewater treatment by combinations of different methods. Biological wastewater treatments that have been well developed for organic and inorganic wastewater treatment are thus a potential method for petrochemical wastewater management. This chapter summarizes the commonly applied petrochemical wastewater pretreatment methods prior biological treatments and compares different biological treatment systems' performance such as biological anaerobic, aerobic and integrated systems. Two case studies are presented for a high chemical oxygen demand (COD) contents petrochemical wastewater treatment in full-scale by applying Biowater Technology's biofilm system continuous flow intermittent cleaning (CFIC) and a pilotscale study by an integrated anaerobic and aerobic biofilm system hybrid vertical anaerobic biofilm (HyVAB). Both processes showed substantial (over 90%) COD removal, while the HyVAB system produced high methane content biogas that can be potentially used as an energy source. Studies of degradation of certain toxic chemicals, such as aromatic compounds in petrochemical wastewater, by the advanced treatment systems incorporating specific organisms can be of good research interest.

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“…A large amount of highly toxic and biodegradable wastewater and waste residue will be produced in the industrial production process of petrochemical products, mainly composed of oily wastewater, phenol-containing wastewater, and high-salt wastewater, containing volatile phenol, benzene, organic acids, and other organic pollutants, which cannot be directly treated by traditional biological methods, and cause serious pollution to the natural water environment [2]. Therefore, it is necessary to pretreat petrochemical wastewater to improve its biodegradability and facilitate subsequent advanced treatment [3].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism

et al. 2022

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Cost-effective pretreatment of highly concentrated and bio-refractory petrochemical wastewater to improve biodegradability is of significant importance, but remains challenging. This study compared the pretreatment of petrochemical wastewater by two commonly used chemical advanced oxidation technologies (Fenton and ozone oxidation), and the mechanisms of biodegradability improvement of pretreated wastewater were explored. The obtained results showed that in the Fenton oxidation system, the COD removal of petrochemical wastewater was 89.8%, BOD5 decreased from 303.66 mg/L to 155.49 mg/L, and BOD5/COD (B/C) increased from 0.052 to 0.62 after 60 min under the condition of 120 mg/L Fe2+ and 500 mg/L H2O2, with a treatment cost of about 1.78 $/kgCOD. In the ozone oxidation system, the COD removal of petrochemical wastewater was 59.4%, BOD5 increased from 127.86 mg/L to 409.28 mg/L, and B/C increased from 0.052 to 0.41 after 60 min at an ozone flow rate of 80 mL/min with a treatment cost of approximately 1.96 $/kgCOD. The petrochemical wastewater treated by both processes meets biodegradable standards. The GC–MS analysis suggested that some refractory pollutants could be effectively removed by ozone oxidation, but these pollutants could be effectively degraded by hydroxyl radicals (•OH) produced by the Fenton reaction. In summary, compared with ozone oxidation, petrochemical wastewater pretreated with Fenton oxidation had high COD removal efficiency and biodegradability, and the treatment cost of Fenton oxidation was also lower than that of ozone oxidation.

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Improving hydrolysis acidification by limited aeration in the pretreatment of petrochemical wastewater

Cited by 74 publications

References 32 publications

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Biological Treatment of Petrochemical Wastewater

Comparison of Fenton and Ozone Oxidation for Pretreatment of Petrochemical Wastewater: COD Removal and Biodegradability Improvement Mechanism

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