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4 results on '"Shu-Guang Lu"'

1. Start-up performances of dry anaerobic mesophilic and thermophilic digestions of organic solid wastes

Author

Masao Ukita, Masahiko Sekine, Shu-guang Lu, and Tsuyoshi Imai

Subjects
Environmental Engineering, medicine.medical_treatment, Arginine, Bioreactors, Digestion (alchemy), medicine, Bioreactor, Environmental Chemistry, Anaerobiosis, Food science, General Environmental Science, chemistry.chemical_classification, Protease, Sewage, beta-Glucosidase, Thermophile, General Medicine, Fatty Acids, Volatile, Urease, Phosphoric Monoester Hydrolases, Anaerobic digestion, Biochemistry, chemistry, Food, Propionate, Anaerobic exercise, Peptide Hydrolases, Mesophile
Abstract

Two dry anaerobic digestions of organic solid wastes were conducted for 6 weeks in a lab-scale batch experiment for investigating the start-up performances under mesophilic and thermophilic conditions. The enzymatic activities, i.e., beta-glucosidase, N-alpha-benzoyl-L-argininamide (BAA)-hydrolysing protease, urease and phosphatase activities were analysed. The BAA-hydrolysing protease activity during the first 2-3 weeks was low with low pH, but was enhanced later with the pH increase. beta-Glucosidase activity showed the lowest values in weeks 1-2, and recovered with the increase of BAA-hydrolysing protease activity. Acetic acid dominated most of the total VFAs in thermophilic digestion, while propionate and butyrate dominated in mesophilic digestion. Thermophilic digestion was confirmed more feasible for achieving better performance against misbalance, especially during the start-up period in a dry anaerobic digestion process.

Published
2007
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2. Biodegradation of perchloroethylene and chlorophenol co-contamination and toxic effect on activated sludge performance

Author

Hui Li, Ji-Dong Gu, Xiao Ming Du, Qiang Lu, Ping Wang, Shu Guang Lu, Xiaoli Wang, Yong Di Liu, Kuang Fei Lin, and Ting Ting Shen

Subjects
Tetrachloroethylene, Environmental Engineering, Firmicutes, Population, Molecular Sequence Data, Bioengineering, Actinobacteria, Microbiology, chemistry.chemical_compound, RNA, Ribosomal, 16S, Food science, Cloning, Molecular, education, Waste Management and Disposal, Phylogeny, Chlorophenol, education.field_of_study, biology, Sewage, Renewable Energy, Sustainability and the Environment, General Medicine, Biodegradation, biology.organism_classification, Phosphoric Monoester Hydrolases, Activated sludge, Biodegradation, Environmental, chemistry, Microbial population biology, Synergistetes, Oxidoreductases, Chlorophenols
Abstract

This study investigated the effects of PCE and 2-CP co-contamination on growth of microbial community in terms of enzymatic activity and microbial diversity in activated sludge. Results showed that the activities of three key enzymes (dehydrogenase, phosphatase and urease) decreased significantly when PCE (in the range of 5–150 mg/L) was mixed with 2-CP (in the range of 25–150 mg/L). Especially, activity of dehydrogenase decreased by more than 93% as the concentration of PCE and 2-CP both reached 150 mg/L. PCR–DGGE revealed that short-term exposure with PCE and 2-CP did not lead to shift in the microbial community structure, while clone library demonstrated a significant change in the microbial diversity after long-term exposure. As the population of Alphaproteobacteria and Gamaproteobacteria decreased, with Actinobacteria eventually disappeared, species including Firmicutes , Bacteroidetes and Synergistetes became dominating groups. This study demonstrated that co-contamination with PCE and 2-CP affected the performance of activated sludge in a significant way.

Published
2012

3. Natural attenuation model and biodegradation for 1,1,1-trichloroethane contaminant in shallow groundwater.

Author

Qiang Lu, Rui-Li Zhu, Jie Yang, Hui Li, Yong-Di Liu, Shu-Guang Lu, Qi-Shi Luo, Kuang-Fei Lin, Strotmann, Uwe, and Dhami, Navdeep K.

Subjects
TRICHLOROETHANE, BIODEGRADATION, GROUNDWATER pollution
Abstract

Natural attenuation is an effective and feasible technology for controlling groundwater contamination. This study investigated the potential effectiveness and mechanisms of natural attenuation of 1,1,1-trichloroethane (TCA) contaminants in shallow groundwater in Shanghai by using a column simulation experiment, reactive transport model, and 16S rRNA gene clone library. The results indicated that the majority of the contaminant mass was present at 2-6 m in depth, the contaminated area was approximately 1000 m x 1000 m, and natural attenuation processes were occurring at the site. The effluent breakthrough curves from the column experiments demonstrated that the effectiveness of TCA natural attenuation in the groundwater accorded with the advection-dispersion-reaction equation. The kinetic parameter of adsorption and biotic dehydrochlorination of TCA was 0.068 m3/kg and 0.0045 d-1. The contamination plume was predicted to diminish and the maximum concentration of TCA decreased to 280 μg/L. The bacterial community during TCA degradation in groundwater belonged to Trichococcus, Geobacteraceae, Geobacter, Mucilaginibacter, and Arthrobacter. [ABSTRACT FROM AUTHOR]

Published
2015
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4. An activated sludge model based on activated sludge model number 3 for full-scale wastewater treatment plant simulation.

Author

Ji Fan, Shu-Guang Lu, Zhao-fu Qiu, Xiao-Xia Wang, and Wen-Zhen Li

Subjects
MICROBIAL products, ORGANIC compounds, CHEMICAL oxygen demand, BIOMASS, SEWAGE sludge
Abstract

A modified model based on the activated sludge model no. 3 was established to simulate a full-scale municipal wastewater treatment plant in Shanghai, China. The activated sludge model no. 3 was modified to describe the simultaneous storage and growth processes occurring in activated sludge systems under aerobic and anoxic conditions. The mechanism of soluble microbial product formation and degradation by microorganisms was considered in this proposed model. Three months simulation was conducted including soluble chemical oxygen demand, NH4+-N, NOX--N and T-N parameters, and compared with measured data from the Quyang wastewater treatment plant. Results indicated that the calculated effluent chemical oxygen demand and NH4+-N using this proposed model were in good agreement with the measured data. Results also showed that besides inert soluble organic matter contributing to the effluent chemical oxygen demand, soluble microbial products played an important part in the effluent chemical oxygen demand and, therefore, demonstrated that these products composed an important portion of effluent soluble chemical oxygen demand in wastewater treatment plants and should not be neglected. [ABSTRACT FROM AUTHOR]

Published
2009
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