Search results for: Wan-Qian Guo

Items from 1 to 20 out of 59 results

article

Nutrients and COD removal of swine wastewater with an isolated microalgal strain Neochloris aquatica CL-M1 accumulating high carbohydrate content used for biobutanol production

Yue Wang, Shih-Hsin Ho, Chieh-Lun Cheng, Dillirani Nagarajan, more

Bioresource Technology > 2017 > 242 > C > 7-14

In this study, a carbohydrate-rich microalga Neochloris aquatica CL-M1 was adapted to grow in swine wastewater. The effects of cultivation conditions (i.e., temperature, light intensity or N/P ratio) on COD/nutrients removal and carbohydrate-rich biomass production were investigated. The results indicate that the highest COD removal (81.7%) and NH₃-N removal (96.2%) was achieved at 150µmolm⁻²s⁻¹ light...

article

Enhancing sludge biodegradability and volatile fatty acid production by tetrakis hydroxymethyl phosphonium sulfate pretreatment

Qing-Lian Wu, Wan-Qian Guo, Xian Bao, Ren-Li Yin, more

Bioresource Technology > 2017 > 239 > C > 518-522

A new pretreatment method based on tetrakis hydroxymethyl phosphonium sulfate (THPS) biocide was tried to enhance sludge disintegration, and improved sludge biodegradability and subsequent volatile fatty acid (VFA) production. Sludge activity decreased to less than 10% after 2 days pretreatment using 20mg/g-TSS THPS, which also obviously destroyed EPS and cell membrane, and dissolved more biodegradable...

article

Biological phosphorus removal in an extended ASM2 model: Roles of extracellular polymeric substances and kinetic modeling

Shan-Shan Yang, Ji-Wei Pang, Wan-Qian Guo, Xiao-Yin Yang, more

Bioresource Technology > 2017 > 232 > C > 412-416

This paper presents the results of an extended ASM2 model for the modeling and calibration of the role of extracellular polymeric substances (EPS) in phosphorus (P) removal in an anaerobic-aerobic process. In this extended ASM2 model, two new components, the bound EPS (XEPS) and the soluble EPS (SEPS), are introduced. Compared with the ASM2, 7.71, 8.53, and 9.28% decreases in polyphosphate (polyP)...

article

CFD optimization of horizontal continuous stirred-tank (HCSTR) reactor for bio-hydrogen production

Pong-Chol Ri, Nan-Qi Ren, Jie Ding, Jong-Su Kim, more

International Journal of Hydrogen Energy > 2017 > 42 > 15 > 9630-9640

This paper described the design on the lab-scale horizontal continuous stirred-tank reactor (HCSTR) that the effective working volume is relatively large and the performance is stable at lower agitating speed. Using the Computational Fluid Dynamics (CFD) simulation with an ethanol-type fermentation process experiment we determined the optimal agitating speed range for the bio-hydrogen production from...

article

Mathematical modeling of simultaneous carbon-nitrogen-sulfur removal from industrial wastewater

Xi-Jun Xu, Chuan Chen, Ai-Jie Wang, Bing-Jie Ni, more

Journal of Hazardous Materials > 2017 > 321 > C > 371-381

A mathematical model of carbon, nitrogen and sulfur removal (C-N-S) from industrial wastewater was constructed considering the interactions of sulfate-reducing bacteria (SRB), sulfide-oxidizing bacteria (SOB), nitrate-reducing bacteria (NRB), facultative bacteria (FB), and methane producing archaea (MPA). For the kinetic network, the bioconversion of C-N by heterotrophic denitrifiers (NO₃⁻→NO₂⁻→N₂...

article

Enhanced volatile fatty acid production from excess sludge by combined free nitrous acid and rhamnolipid treatment

Qing-Lian Wu, Wan-Qian Guo, Xian Bao, He-Shan Zheng, more

Bioresource Technology > 2017 > 224 > C > 727-732

VFA production from excess sludge (ES) was greatly enhanced by a low-cost and high-efficient treatment: 0.67mg/L free nitrous acid (FNA) pretreatment combined with 0.04g/g TSS rhamnolipid (RL) addition (FNA+RL), which significantly shortened fermentation time to 3days and increased VFA production to 352.26mgCOD/g VSS (5.42 times higher than raw ES). Propionic and acetic acids were the two leading...

article

Perspectives on the feasibility of using microalgae for industrial wastewater treatment

Yue Wang, Shih-Hsin Ho, Chieh-Lun Cheng, Wan-Qian Guo, more

Bioresource Technology > 2016 > 222 > C > 485-497

Although microalgae can serve as an appropriate alternative feedstock for biofuel production, the high microalgal cultivation cost has been a major obstacle for commercializing such attempts. One of the feasible solution for cost reduction is to couple microalgal biofuel production system with wastewater treatment, as microalgae are known to effectively eliminate a variety of nutrients/pollutants...

article

Removal of cephalosporin antibiotics 7-ACA from wastewater during the cultivation of lipid-accumulating microalgae

Wan-Qian Guo, He-Shan Zheng, Shuo Li, Juan-Shan Du, more

Bioresource Technology > 2016 > 221 > C > 284-290

The aim of this study is to evaluate the feasibility of using lipid-accumulating microalgae to remove cephalosporin antibiotics 7-amino cephalosporanic acid (7-ACA) from wastewater with the additional benefit of biofuels production. Three isolated microalgal strains (namely, Chlorella sp. Cha-01, Chlamydomonas sp. Tai-03 and Mychonastes sp. YL-02) were cultivated under 7-ACA stress and their biomass...

article

A review on bioconversion of lignocellulosic biomass to H2: Key challenges and new insights

Nan-Qi Ren, Lei Zhao, Chuan Chen, Wan-Qian Guo, more

Bioresource Technology > 2016 > 215 > C > 92-99

With the increasing energy crisis and rising concern over climate change, the development of clean alternative energy sources is of great importance. Biohydrogen produced from lignocellulosic biomass is a promising candidate, because of its positives such as readily available, no harmful emissions, environment friendly, efficient, and renewable. However, obstacles still exist to enable the commercialization...

article

Enhancement of volatile fatty acid production by co-fermentation of food waste and excess sludge without pH control: The mechanism and microbial community analyses

Qing-Lian Wu, Wan-Qian Guo, He-Shan Zheng, Hai-Chao Luo, more

Bioresource Technology > 2016 > 216 > C > 653-660

The study provided a cost-effective and high-efficiency volatile fatty acid (VFA) production strategy by co-fermentation of food waste (FW) and excess sludge (ES) without artificial pH control. VFA production of 867.42mg COD/g-VS was obtained under the optimized condition: FW/ES 5, solid retention time 7d, organic loading rate 9g VS/L-d and temperature 40°C. Mechanism exploration revealed that the...

article

Promotion effects of ultrasound on sludge biodegradation by thermophilic bacteria Geobacillus stearothermophilus TP-12

Wan-Qian Guo, He-Shan Zheng, Shuo Li, Shih-Hsin Ho, more

Biochemical Engineering Journal > 2016 > 105 > PA > 281-287

Sludge biodegradation using thermophilic bacteria is a promising method for sludge treatment. In order to further enhance the efficiency of sludge reduction and hydrolysis, low-frequency ultrasound was used to promote this process. We isolated a thermophilic strain that is effective in secreting extracellular protease to hydrolyze sludge. Then the key ultrasound parameters were selected using the...

article

Economical evaluation of sludge reduction and characterization of effluent organic matter in an alternating aeration activated sludge system combining ozone/ultrasound pretreatment

Shan-Shan Yang, Wan-Qian Guo, Yi-Di Chen, Qing-Lian Wu, more

Bioresource Technology > 2015 > 177 > C > 194-203

An ozone/ultrasound lysis–cryptic growth technology combining a continuous flow anaerobic–anoxic–microaerobic–aerobic (AAMA+O₃/US) system was investigated. Techno-economic evaluation and sludge lyses return ratio (r) optimization of this AAMA+O₃/US system were systematically and comprehensively discussed. Economic assessment demonstrated that this AAMA+O₃/US system with r of 30% (AAMA+O₃/US_2# system)...

article

Reduction of 4-chloronitrobenzene in a bioelectrochemical reactor with biocathode at ambient temperature for a long-term operation

Wan-Qian Guo, Shuang Guo, Ren-Li Yin, Yuan Yuan, more

Journal of the Taiwan Institute of Chemical Engineers > 2015 > 46 > Complete > 119-124

In this study, the enhancement on 4-chloronitrobenzene (4-CNB) reduction was investigated in a dual-bioelectrochemical system with the cathode seeded by enriched 4-CNB degradation inoculums. We demonstrated that the biocathode had the ability to promote 4-CNB reduction and avoid more reluctant byproducts production. At room temperature, when initial 4-CNB concentration was 20mg/L with 0.5V external...

article

Sulfamethoxazole degradation by ultrasound/ozone oxidation process in water: Kinetics, mechanisms, and pathways

Wan-Qian Guo, Ren-Li Yin, Xian-Jiao Zhou, Juan-Shan Du, more

Ultrasonics - Sonochemistry > 2015 > 22 > Complete > 182-187

In this research, sulfamethoxazole (SMX) degradation was investigated using ultrasound (US), ozone (O ₃ ) and ultrasound/ozone oxidation process (UOOP). It was proved that ultrasound significantly enhanced SMX ozonation by assisting ozone in producing more hydroxyl radicals in UOOP. Ultrasound also made the rate constants improve by kinetics analysis. When ultrasound was added to the ozonation...

article

Possible causes of excess sludge reduction adding metabolic uncoupler, 3,3′,4′,5-tetrachlorosalicylanilide (TCS), in sequence batch reactors

Xiao-Chi Feng, Wan-Qian Guo, Shan-Shan Yang, He-Shan Zheng, more

Bioresource Technology > 2014 > 173 > C > 96-103

Two parallel sequence batch reactors (SBRs) were operated, with and without TCS addition, to research the causes of sludge reduction by uncouplers. Three possible mechanisms of sludge reduction by TCS were studied: (1) occurrence of metabolic uncoupling, (2) consumption of more energy to resist the infection of TCS, (3) promotion of lysis–cryptic growth by TCS addition. Results showed the remarkable...

article

Hydrogen production using biocathode single-chamber microbial electrolysis cells fed by molasses wastewater at low temperature

Yue Wang, Wan-Qian Guo, De-Feng Xing, Jo-Shu Chang, more

International Journal of Hydrogen Energy > 2014 > 39 > 33 > 19369- 19375

Molasses is by-product from sugar beet process and commonly used as raw material for ethanol production. However, the molasses wastewater possesses high level of chemical oxygen demand (COD), which needs to be properly treated before discharge. In this work, MEC technology, a promising method for hydrogen production from organic waste, was utilized to produce H₂ from molasses wastewater. In this study,...

article

Thermophilic hydrogen production from sludge pretreated by thermophilic bacteria: Analysis of the advantages of microbial community and metabolism

He-Shan Zheng, Wan-Qian Guo, Shan-Shan Yang, Xiao-Chi Feng, more

Bioresource Technology > 2014 > 172 > C > 433-437

In this study, the effects of thermophilic bacteria pretreatment and elevated fermentation temperature on hydrogen production from sludge were examined. The highest hydrogen yield of 19.9mlH₂g⁻¹ VSS was achieved at 55°C by using pretreated sludge, which was 48.6% higher than raw sludge without pretreatment, and 28.39% higher than when fermented at 35°C. To explore the internal factors of this superior...

article

Characterization and kinetics of bio-butanol production with Clostridium acetobutylicum ATCC824 using mixed sugar medium simulating microalgae-based carbohydrates

Yue Wang, Wan-Qian Guo, Yung-Chung Lo, Jo-Shu Chang, more

Biochemical Engineering Journal > 2014 > 91 > Complete > 220-230

Our recent work showed that Chlorella vulgaris JSC-6 can accumulate over 50% carbohydrates per dry weight, which mainly contain glucose and xylose as the monosaccharides. In this study, synthetic mixed sugars simulating the hydrolyzed biomass of C. vulgaris JSC-6 (primarily containing glucose and xylose at a ratio of 5:1–6.5:1) was used as the carbon source for bio-butanol production with Clostridium...

article

Minimization of excess sludge production by in-situ activated sludge treatment processes — A comprehensive review

Wan-Qian Guo, Shan-Shan Yang, Wen-Sheng Xiang, Xiang-Jing Wang, more

Biotechnology Advances > 2013 > 31 > 8 > 1386-1396

The widespread application of conventional activated sludge treatment process has been employed to deal with a variety of municipal and industrial sewage. While the generation of waste activated sludge (WAS) was considerably huge, the management and disposal expenses were substantially costly. A promising process aimed for WAS reduction during the operation process is urgently needed. Thus, increasing...

article

Accelerated startup of hydrogen production expanded granular sludge bed with l-Cysteine supplementation

Wan-Qian Guo, Jie Ding, Guang-Li Cao, Chuan Chen, more

Energy > 2013 > 60 > Complete > 94-98

l-Cysteine (l-Cys) was added to EGSB (expanded granular sludge bed) reactors during the startup process. A parallel EGSB without l-Cys addition was started as a control. The results showed that the startup process of the EGSB with l-Cys supplementation was well accelerated compared to the control reactor (without supplementation). Supplementation of l-Cys every four HRT (hydraulic retention time)...

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Search results for: Wan-Qian Guo

Nutrients and COD removal of swine wastewater with an isolated microalgal strain Neochloris aquatica CL-M1 accumulating high carbohydrate content used for biobutanol production

Enhancing sludge biodegradability and volatile fatty acid production by tetrakis hydroxymethyl phosphonium sulfate pretreatment

Biological phosphorus removal in an extended ASM2 model: Roles of extracellular polymeric substances and kinetic modeling

CFD optimization of horizontal continuous stirred-tank (HCSTR) reactor for bio-hydrogen production

Mathematical modeling of simultaneous carbon-nitrogen-sulfur removal from industrial wastewater

Enhanced volatile fatty acid production from excess sludge by combined free nitrous acid and rhamnolipid treatment

Perspectives on the feasibility of using microalgae for industrial wastewater treatment

Removal of cephalosporin antibiotics 7-ACA from wastewater during the cultivation of lipid-accumulating microalgae

A review on bioconversion of lignocellulosic biomass to H2: Key challenges and new insights

Enhancement of volatile fatty acid production by co-fermentation of food waste and excess sludge without pH control: The mechanism and microbial community analyses

Promotion effects of ultrasound on sludge biodegradation by thermophilic bacteria Geobacillus stearothermophilus TP-12

Economical evaluation of sludge reduction and characterization of effluent organic matter in an alternating aeration activated sludge system combining ozone/ultrasound pretreatment

Reduction of 4-chloronitrobenzene in a bioelectrochemical reactor with biocathode at ambient temperature for a long-term operation

Sulfamethoxazole degradation by ultrasound/ozone oxidation process in water: Kinetics, mechanisms, and pathways

Possible causes of excess sludge reduction adding metabolic uncoupler, 3,3′,4′,5-tetrachlorosalicylanilide (TCS), in sequence batch reactors

Hydrogen production using biocathode single-chamber microbial electrolysis cells fed by molasses wastewater at low temperature

Thermophilic hydrogen production from sludge pretreated by thermophilic bacteria: Analysis of the advantages of microbial community and metabolism

Characterization and kinetics of bio-butanol production with Clostridium acetobutylicum ATCC824 using mixed sugar medium simulating microalgae-based carbohydrates

Minimization of excess sludge production by in-situ activated sludge treatment processes — A comprehensive review

Accelerated startup of hydrogen production expanded granular sludge bed with l-Cysteine supplementation

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