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| 1 | Enhancing sewage sludge dewaterability by bioleaching approach with comparison to other physical and chemical conditioning methods显示文摘The sewage sludge conditioning process is critical to improve the sludge dewaterability prior to mechanical dewatering.Traditionally,sludge is conditioned by physical or chemical approaches,mostly with the addition of inorganic or organic chemicals.Here we report that bioleaching,an efficient and economical microbial method for the removal of sludge-borne heavy metals,also plays a significant role in enhancing sludge dewaterability.The effects of bioleaching and physical or chemical approaches on sludge dewaterability were compared.The conditioning result of bioleaching by Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans on sludge dewatering was investigated and compared with the effects of hydrothermal(121°C for 2 hr),microwave(1050 W for 50 sec),ultrasonic(250 W for 2 min),and chemical conditioning(24% ferric chloride and 68% calcium oxide;dry basis).The results show that the specific resistance to filtration(SRF) or capillary suction time(CST) of sludge is decreased by 93.1% or 74.1%,respectively,after fresh sludge is conditioned by bioleaching,which is similar to chemical conditioning treatment with ferric chloride and calcium oxide but much more effective than other conditioning approaches including hydrothermal,microwave,and ultrasonic conditioning.Furthermore,after sludge dewatering,bioleached sludge filtrate contains the lowest concentrations of chroma(18 times),COD(542 mg/L),total N(TN,300 mg/L),NH 4 +-N(208 mg/L),and total P(TP,2 mg/L) while the hydrothermal process resulted in the highest concentration of chroma(660 times),COD(18,155 mg/L),TN(472 mg/L),NH 4 +-N(381 mg/L),and TP(191 mg/L) among these selected conditioning methods.Moreover,unlike chemical conditioning,sludge bioleaching does not result in a significant reduction of organic matter,TN,and TP in the resulting dewatered sludge cake.Therefore,considering sludge dewaterability and the chemical properties of sludge filtrate and resulting dewatered sludge cakes,bioleaching has potential as an approach for improving sludge dewaterability and reducing the cost of subsequent reutilization or disposal of dewatered sludge. | Fenwu Liu Jun Zhou Dianzhan Wang Lixiang Zhou | 2012 | Journal of Environmental Sciences2012，24，8： | 26 |
| 2 | Maximal methane potential of different animal manures collected in northwest region of China显示文摘Maximum methane potential(B0)is an important parameter used in assessing suitability of a substrate for biogas production.This study examined maximum methane potential of different manures generated from three major Chinese livestock,namely chicken,hog and cattle,and evaluated the important factors that affect the maximum methane potential of a substrate.The livestock manures collected from the local farms were incubated under a thermophilic anaerobic condition(55℃).The results showed that the maximum methane potential(B0)of cattle,hog and chicken manures were 292.0 mL/g VS,272.0 mL/g VS and 266.4 mL/g VS,respectively.The B0 value decreases with increasing contents of crude protein and crude fat,while increases with increasing the contents of carbohydrates and crude fiber in manures.The content of NH4+-N in chicken manure was significantly higher during the digestion period,reached as high as 1962.5 mg/L by the end of incubation period.Heavy metals of Cu and Zn in the manure also affect the B0.Empirical relationships that describe the B0 decrease in response to increase of Zn and Cu contents in manure were developed and used as a simple tool to assess the effects of these metals on the B0.It was concluded that the protein,Cu and Zn contents of manure are most important chemical compositions that negatively affect maximum methane potential.Based on the three experimental manures,the maximum methane potential was limited by either ammonium content or Cu and Zn content in the manure.For a commercial biogas production facility using these manures as main feedstock,one should consider to add co-substrate or co-substrates to reduce concentration of these chemicals to maximize biogas production. | Chen Fen Yu Gao Li Wei Liu Fenwu Zhang Wuping Bu Yushan Li Xiaomei | 2017 | International Journal of Agricultural and Biological Engineering2017，10，1： | 2 |
| 3 | Improvement of sludge dewaterability and removal of sludge-borne metals by bioleaching at optimum pH显示文摘 | Fenwu Liu Lixiang Zhou Jun Zhou Xingwei Song Dianzhan Wang | 2012 | Journal of Hazardous Materials2012，，： | 2 |
| 4 | Improvement of sludge dewaterability and removal of sludge-borne metals by bioleaching at optimum pH显示文摘 | Fenwu Liu Lixiang Zhou Jun Zhou Xingwei Song Dianzhan Wang | 2012 | Journal of Hazardous Materials2012，，： | 1 |
| 5 | Systematic Gain‐Scheduling Control Design: A Missile Autopilot Example显示文摘 | FenWu AndyPackard GaryBalas | 2008 | Asian Journal of Control2008，，3： | 1 |
| 6 | Drain data to predict clinically relevant pancreatic fistula显示文摘 | Daniel J.Moskovic Sally E.Hodges Meng‐FenWu F. CharlesBrunicardi Susan G.Hilsenbeck William E.Fisher | 2010 | HPB2010，，7： | 1 |
| 7 | Improvement of sludge dewaterability and removal of sludge-borne metals by bioleaching at optimum pH 显示文摘 | Liu Fenwu Zhou Lixiang Zhou Jun | 2012 | Journal of Hazardous Materials2012，，： | 1 |
| 8 | Reducing residues of tetracycline and its resistance genes in soil-maize system and improving plant growth:Selecting the best remediation substance显示文摘Tetracycline(TC)and tetracycline resistance genes(TRGs)in plant edible tissues pose a potential risk to the environment and then to human health.This study used a pot experiment to investigate the effects of different remediation substances(worm castings,fungal chaff,microbial inoculum,and biochar)on the physiological characteristics of maize and the residues of TC and TRGs in the soil-maize system under TC stress.The results showed that TC significantly inhibited growth,disrupted the antioxidant defense system balance,and increased proline and malondialdehyde contents of maize plants.Tetracycline residue contents were significantly higher in root than in shoot,and followed the order root>stem-leaf>grain,which was consistent with the distribution of bioconcentration factors in the different organs of maize plants.The TC residue content in the soil under different treatments was 0.013–1.341 mg kg-1.The relative abundances of different antibiotic resistance genes in the soil-maize system varied greatly,and in maize plants followed the order intI1>tetW>tetG>tet B>tetM>tetX>tetO.In the soil,tetX had the highest relative abundance,followed by tetG and tetW.A redundancy analysis(RDA)showed that TC was positively correlated with TRGs.The addition of different remediation substances alleviated the toxicity of TC on maize physiological characteristics and reduced the TC and TRG residues in the soil-maize system,with biochar being the best remediation substance.These results provide new insights into the effect of biochar on the migration of TC and TRGs from soil to plants. | Junmei QIN Jianli SONG Fenwu LIU Jian ZHANG Huaye XIONG Wenlong BI Yue NI | 2022 | Pedosphere2022，32，2： | 0 |
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