Steady-state radiolysis experiments were performed to investigate the γ-irradiation treatment of pentachlorophenol (PCP) in aqueous solution. The e?ect of initial concentration on the PCP degradation was also investi...Steady-state radiolysis experiments were performed to investigate the γ-irradiation treatment of pentachlorophenol (PCP) in aqueous solution. The e?ect of initial concentration on the PCP degradation was also investigated. The experimental results showed that γirradiation was able to degrade PCP in aqueous solution successfully, and the radiolytical degradation process of PCP could be described by the first-order kinetic model. When the initial concentration of PCP was 25 and 50 mg/L and the radiation dose ...展开更多
The method of enriching PCP(pentachlorophenol) from aquatic environment by solid phase extraction(SPE) was studied. Several factors affecting the recoveries of PCP, including sample pH, eluting solvent, eluting volume...The method of enriching PCP(pentachlorophenol) from aquatic environment by solid phase extraction(SPE) was studied. Several factors affecting the recoveries of PCP, including sample pH, eluting solvent, eluting volume and flow rate of water sample, were optimized by orthogonal array design(OAD). The optimized results were sample pH 4; eluting solvent, 100% methanol; eluting solvent volume, 2 ml and flow rate of water sample, 4 ml/min. A comparison is made between SPE and liquid-liquid extraction(LLE) method. The recoveries of PCP were in the range of 87.6%—133.6% and 79%—120.3% for SPE and LLE, respectively. Important advantages of the SPE compared with the LLE include the short extraction time and reduced consumption of organic solvents. SPE can replace LLE for isolating and concentrating PCP from water samples.展开更多
Cultivation of aerobic granular sludge for pentachlorophenol(PCP) degradation under microaerobic condition(DO concentration was controlled at 0.2—0.7 mg/L) was studied in this paper. Anaerobic granules were selected ...Cultivation of aerobic granular sludge for pentachlorophenol(PCP) degradation under microaerobic condition(DO concentration was controlled at 0.2—0.7 mg/L) was studied in this paper. Anaerobic granules were selected as inoculum. The changes of appearance were observed and the variations of SVI, VSS/TSS, PN/PS and the size of sludge were measured during cultivating. The capabilities for degradation of PCP, AOX and COD_ Cr were also studied. Observations on mature granules were carried out by scanning electron microscope, and the results indicated bacillus was dominant on the surface of granules while in the inner of granules both bacillus and coccus were the dominant microorganisms. K, Na, Fe, Ca, Mg, Ni, Co, Mn, Cu and Zn were detected in the granules by element analysis.展开更多
结合乐理理论和信号处理理论,针对传统和弦识别仅考虑音高特性的音级轮廓特征PCP(pitch class profile)造成正确识别率较低的问题,提出一种以反映听觉特性的MFCC(mel frequency cepstral coefficent)与PCP的联合特征和稀疏表示分类器(sp...结合乐理理论和信号处理理论,针对传统和弦识别仅考虑音高特性的音级轮廓特征PCP(pitch class profile)造成正确识别率较低的问题,提出一种以反映听觉特性的MFCC(mel frequency cepstral coefficent)与PCP的联合特征和稀疏表示分类器(sparse representation classification,SRC)的和弦识别方法.通过对两特征矢量的叠加构成新的和弦特征,然后利用SRC进行和弦识别.实验结果表明,与传统方法的识别率相比,本方法的识别率大幅提高.展开更多
基金the National NaturalScience Foundation of China (No. 50678089)and the Excellent Young Teacher Program of MOE,China.
文摘Steady-state radiolysis experiments were performed to investigate the γ-irradiation treatment of pentachlorophenol (PCP) in aqueous solution. The e?ect of initial concentration on the PCP degradation was also investigated. The experimental results showed that γirradiation was able to degrade PCP in aqueous solution successfully, and the radiolytical degradation process of PCP could be described by the first-order kinetic model. When the initial concentration of PCP was 25 and 50 mg/L and the radiation dose ...
文摘The method of enriching PCP(pentachlorophenol) from aquatic environment by solid phase extraction(SPE) was studied. Several factors affecting the recoveries of PCP, including sample pH, eluting solvent, eluting volume and flow rate of water sample, were optimized by orthogonal array design(OAD). The optimized results were sample pH 4; eluting solvent, 100% methanol; eluting solvent volume, 2 ml and flow rate of water sample, 4 ml/min. A comparison is made between SPE and liquid-liquid extraction(LLE) method. The recoveries of PCP were in the range of 87.6%—133.6% and 79%—120.3% for SPE and LLE, respectively. Important advantages of the SPE compared with the LLE include the short extraction time and reduced consumption of organic solvents. SPE can replace LLE for isolating and concentrating PCP from water samples.
基金The Guangdong Natural Science Foundation(No. 31430) State Key Laboratory of Pulp and Paper Making Engineering, South China University of Technology(No. 200335) and the Laboratory of Cellulose and Lignocellulosics Chemistry, Chinese Academy of Sciences(No.K 147)
文摘Cultivation of aerobic granular sludge for pentachlorophenol(PCP) degradation under microaerobic condition(DO concentration was controlled at 0.2—0.7 mg/L) was studied in this paper. Anaerobic granules were selected as inoculum. The changes of appearance were observed and the variations of SVI, VSS/TSS, PN/PS and the size of sludge were measured during cultivating. The capabilities for degradation of PCP, AOX and COD_ Cr were also studied. Observations on mature granules were carried out by scanning electron microscope, and the results indicated bacillus was dominant on the surface of granules while in the inner of granules both bacillus and coccus were the dominant microorganisms. K, Na, Fe, Ca, Mg, Ni, Co, Mn, Cu and Zn were detected in the granules by element analysis.
文摘结合乐理理论和信号处理理论,针对传统和弦识别仅考虑音高特性的音级轮廓特征PCP(pitch class profile)造成正确识别率较低的问题,提出一种以反映听觉特性的MFCC(mel frequency cepstral coefficent)与PCP的联合特征和稀疏表示分类器(sparse representation classification,SRC)的和弦识别方法.通过对两特征矢量的叠加构成新的和弦特征,然后利用SRC进行和弦识别.实验结果表明,与传统方法的识别率相比,本方法的识别率大幅提高.
