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| 1 | Kinetic analysis of waste activated sludge hydrolysis and short-chain fatty acids production at pH 10显示文摘The accumulation of short-chain fatty acids (SCFAs), a preferred carbon source for enhanced biological phosphorus removal microbes, was significantly improved when waste activated sludge (WAS) was fermented at pH 10. The kinetics of WAS hydrolysis and SCFAs production at pH 10 was investigated. It was observed that during WAS anaerobic fermentation the accumulation of SCFAs was limited by the hydrolysis process, and both the hydrolysis of WAS particulate COD and the accumulation of SCFAs followed first-order kinetics. The hydrolysis and SCFAs accumulation rate constants increased with increasing temperature from 10 to 35°C, which could be described by the Arrhenius equation. The kinetic data further indicated that SCFAs production at pH 10 was a biological process. Compared with the experiment of pH uncontrolled (blank test), both the rate constants of WAS hydrolysis and SCFAs accumulation at 20°C were improved significantly when WAS was fermented at pH 10. | FENG Leiyu, YAN Yuanyuan, CHEN Yinguang State key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. | 2009 | Journal of Environmental Sciences2009，21，5： | 12 |
| 2 | Co-fermentation of waste activated sludge with food waste for short-chain fatty acids production:effect of pH at ambient temperature显示文摘Effect of pH ranging from 4.0 to 11.0 on cofermentation of waste activated sludge(WAS)with food waste for short-chain fatty acids(SCFAs)production at ambient temperature was investigated in this study.Experimental results showed that the addition of food waste significantly improved the performance of WAS fermentation system,which resulted in the increases of SCFAs production and substrate reduction.The SCFAs production at pH 6.0,7.0,8.0,and 9.0 and fermentation time of 4 d was respectively 5022.7,6540.5,8236.6,and 7911.7 mg COD·L^(-1),whereas in the blank tests(no pH adjustment,pH 8.0(blank test 1),no food waste addition,pH 8.0(blank test 2),and no WAS addition(blank test 3))it was only 1006.9,971.1,and 1468.5 mg COD·L^(-1),respectively.The composition of SCFAs at pH from 6.0 to 9.0 was also different from other conditions and propionic acid was the most prevalent SCFA,which was followed by acetic and n-butyric acids,while acetic acid was the top product under other conditions.At pH 8.0 a higher volatile suspended solids(VSS)reduction of 16.6%for the mixture of WAS and food waste than the sole WAS indicated a synergistic effect existing in fermentation system with WAS and food waste.The influence of pH on the variations of nutrient content was also studied during anaerobic fermentation of the mixture of WAS and food waste at different pH conditions.The release of NH_(4)^(+)-N increased with fermentation time at all pH values investigated except 4.0,5.0 and in blank test one.The concentrations of soluble phosphorus at acidic pHs and in the blank test one were higher than those obtained at alkaline pHs.Ammonia and phosphorus need to be removed before the SCFAsenriched fermentation liquid from WAS and food waste was used as the carbon source. | Leiyu FENG Yuanyuan YAN Yinguang CHEN | 2011 | Frontiers of Environmental Science & Engineering2011，5，4： | 8 |
| 3 | A new process to improve short-chain fatty acids and bio-methane generation from waste activated sludge显示文摘As an important intermediate product, short-chain fatty acids(SCFAs) can be generated after hydrolysis and acidification from waste activated sludge, and then can be transformed to methane during anaerobic digestion process. In order to obtain more SCFA and methane,most studies in literatures were centered on enhancing the hydrolysis of sludge anaerobic digestion which was proved as un-efficient. Though the alkaline pretreatment in our previous study increased both the hydrolysis and acidification processes, it had a vast chemical cost which was considered uneconomical. In this paper, a low energy consumption pretreatment method, i.e. enhanced the whole three stages of the anaerobic fermentation processes at the same time, was reported, by which hydrolysis and acidification were both enhanced, and the SCFA and methane generation can be significantly improved with a small quantity of chemical input. Firstly, the effect of different pretreated temperatures and pretreatment time on sludge hydrolyzation was compared. It was found that sludge pretreated at 100°C for 60 min can achieve the maximal hydrolyzation. Further, effects of different initial p Hs on acidification of the thermal pretreated sludge were investigated and the highest SCFA was observed at initial p H 9.0with fermentation time of 6 d, the production of which was 348.63 mg COD/g VSS(6.8 times higher than the blank test) and the acetic acid was dominant acid. Then, the mechanisms for this new pretreatment significantly improving SCFA production were discussed. Finally,the effect of this low energy consumption pretreatment on methane generation was investigated. | Bin Dong Peng Gao Dong Zhang Yinguang Chen Lingling Dai Xiaohu Dai | 2016 | Journal of Environmental Sciences2016，28，5： | 7 |
| 4 | Effect of the addition of organic carbon sources on nitrous oxide emission in anaerobic-aerobic(low dissolved oxygen)sequencing batch reactors显示文摘The effect of additional organic carbon sources on the production of nitrous oxide(N_(2)O)in anaerobicaerobic(low dissolved oxygen)real wastewater treatment system was investigated.In this paper,three laboratoryscale sequencing batch reactors(SBRs)(SBR-1,SBR-2 and SBR-3)were operating under an anaerobic-aerobic(low dissolved oxygen,0.15-0.45 mg·L^(-1))configuration.The SBRs were‘long-term cultured’respectively with a single municipal wastewater sample,sodium acetate,and a waste-activated sludge alkaline fermentation liquid as the additional carbon sources of real wastewater.Off-gas analysis showed that N_(2)O was emitted into the atmosphere during the aerobic(low dissolved oxygen)period in the three SBRs,and the order of N_(2)O emission rate was SBR-2>SBR-1>SBR-3.It was observed that the higher poly-β-hydroxyvalerate fraction of polyhydroxyalkanoates,the lower glycogen transformation and less nitrite accumulation was in SBR-3,while the opposite behavior was observed in SBR-2.Further research indicated that the interaction of the factors above potentially affected the N_(2)O emission in the anaerobic-aerobic(low dissolved oxygen)system. | Hongjing LI Xiurong CHEN Yinguang CHEN | 2010 | Frontiers of Environmental Science & Engineering2010，4，4： | 5 |
| 5 | Research on polyhydroxyalkanoates and glycogen transformations: Key aspects to biologic nitrogen and phosphorus removal in low dissolved oxygen systems显示文摘In this paper,a study was conducted on the effect of polyhydroxyalkanoates(PHA)and glycogen transformations on biologic nitrogen and phosphorus removal in low dissolved oxygen(DO)systems.Two laboratory-scale sequencing batch reactors(SBR1 and SBR2)were operating with anaerobic/aerobic(low DO,0.15-0.45 mg·L^(-1))configurations,which cultured a propionic to acetic acid ratio(molar carbon ratio)of 1.0 and 2.0,respectively.Fewer poly-3-hydroxybutyrate(PHB),total PHA,and glycogen transformations were observed with the increase of propionic/acetic acid,along with more poly-3-hydroxyvalerate(PHV)and poly-3-hydroxy-2-methyvalerate(PH2MV)shifts.The total nitrogen(TN)removal efficiency was 68%and 82%in SBR1 and SBR2,respectively.In the two SBRs,the soluble ortho-phosphate(SOP)removal efficiency was 94%and 99%,and the average sludge polyphosphate(poly-P)content(g·g-MLVSS^(-1))was 8.3%and 10.2%,respectively.Thus,the propionic to acetic acid ratio of the influent greatly influenced the PHA form and quantity,glycogen transformation,and poly-P contained in activated sludge and further determined TN and SOP removal efficiency.Moreover,significant correlations between the SOP removal rate and the(PHV+PH2MV)/PHA ratio were observed(R^(2)>0.99).Accordingly,PHA and glycogen transformations should be taken into account as key components for optimizing anaerobic/aerobic(low DO)biologic nitrogen and phosphorus removal systems. | Hongjing LI Yinguang CHEN | 2011 | Frontiers of Environmental Science & Engineering2011，5，2： | 3 |
| 6 | Enhanced biological nutrient removal in a simultaneous fermentation, denitrification and phosphate removal reactor using primary sludge as internal carbon source显示文摘 | Liang Zhang Shujun Zhang Shuying Wang Chengcheng Wu Yinguang Chen Yayi Wang Yongzhen Peng | 2013 | Chemosphere2013，，： | 2 |
| 7 | Effect of initial pH control on enhanced biological phosphorus removal from wastewater contai- ning acetic and propionic acids显示文摘 | Liu Yan Chen Yinguang Zhou Qi | 2007 | Chemosphere2007，66，1： | 1 |
| 8 | Enhanced phosphorus biological removal from wastewater-effect of microorganism acclimatization with different ratios of short-chain fatty acids mixture显示文摘 | Yinguang Chen Yan Liu Qi Zhou Guowei Gu | 2005 | Biochemical Engineering Journal2005，27，： | 1 |
| 9 | Effect of cell fermentation time and biomass drying strategies on recovery of PHA from Alcaligenes eutrophus using a surfactant-chelate aqueous system显示文摘 | Yinguang Chen Qing Xu Haizhen Yang | 2001 | Process Biochemistry2001，36，89： | 1 |
| 10 | The efficiency of enhanced biological phosphorus removal from real wastewater affected by different ratio of acetic to propionic acid显示文摘 | Yinguang Chen Andrew A R Terrence M | 2004 | Water Research2004，38，1： | 1 |
| 11 | Hydrolysis andacidification of waste activated sludge at different pHs显示文摘 | Chen Yinguang Jiang Su Yuan Hongying | 2007 | WaterResearch2007，41，3： | 1 |
| 12 | Enhanced phosphorus biological removal from wastewater:effeet of microorganism acclimatization with different ratios of short-chain fatty acids mixture显示文摘 | CHEN Yinguang LIU Yan ZHOU Qi | 2005 | Biochemical Engineering Journal2005，27，1： | 1 |
| 13 | Waste activated sludgehydrolysis and short-chain fatty acids accumulation undermesophilic and thermophilic conditions:Effect of pH显示文摘 | Zhang Peng Chen Yinguang Zhou Qi | 2009 | WaterResearch2009，43，15： | 1 |
| 14 | Effect of solidsretention time and temperature on waste activated sludge hydrolysisand short-chain fatty acids accumulation under alkaline conditionsin continuous-flow reactors显示文摘 | Feng Leiyu Wang Hua Chen Yinguang | 2009 | Bioresource Technology2009，100，1： | 1 |
| 15 | Recovery of nitrogen and phosphorus from alkaline fermentation liquid of waste activated sludge and application of the fermentation liquid to promote biological municipal wastewater treatment显示文摘 | Tong Juan Chen Yinguang | 2009 | Water Research2009，43，12： | 1 |
| 16 | Improved bioproduction of short-chain fatty acids (SCFAs) from excess sludge under alkaline conditions显示文摘 | Yuan Hongying Chen Yinguang Zhang Huaxing | | 0，，06： | 1 |
| 17 | Waste activated sludge fermentation for hydrogen production enhanced by anaerobic process improvement and acetoba-cteria inhibition : the role of fermentation pH显示文摘 | Zhao Yuxiao Chen Yinguang Zhang Dong | 2010 | Environment and Science Technology2010，44，9： | 1 |
| 18 | The efficiency of enhanced biological phosphorus removal from real wastewater affected by different ratios of acetic to propionic acid显示文摘 | Chen Yinguang Randall A A Mccue T | 2004 | Water Research2004，38，1： | 1 |
| 19 | Effect of sodium dodecylsulfate on waste activated sludge hydrolysis and acidification显示文摘 | Jiang Su Chen Yinguang Zhou Qi | 2007 | Chemical Engineering Journal2007，132，13： | 1 |
| 20 | Enhanced biological phosphor- us removal driven by short chain fatty acids produced from waste activated sludge alkaline fermentation显示文摘 | TONG Juan CHEN Yinguang | 2007 | Environmental Science & Technology2007，41，20： | 1 |
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