Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization

Nanjing, China

Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization

Nanjing, China
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Yan S.,Nanjing Agricultural University | Zheng G.,Nanjing Agricultural University | Zheng G.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Meng X.,Nanjing Agricultural University | And 2 more authors.
Separation and Purification Technology | Year: 2017

Schwertmannite and jarosite, two secondary Fe(III)-hydroxysulfate minerals abundant in acid-mine drainage, can be biosynthesized by an Fe-oxidizing bacterium Acidithiobacillus ferrooxidans, but the differences of their catalytic activities in heterogeneous Fenton-like reactions are still unclear to date. In the present study, the catalytic activities of biosynthesized schwertmannite and jarosite were compared through investigating the heterogeneous Fenton-like degradation of a target organic pollutant phenol. Results showed that these two catalysts efficiently catalyzed heterogeneous Fenton-like degradation of phenol, and the degradation in both systems consisted of an induction period (first-stage) and a followed rapid degradation stage (second-stage). Schwertmannite exhibited a much higher catalytic capacity than jarosite, because of its shorter induction period and higher kinetic rate (k) of the second-stage, but jarosite catalytically degraded phenol in a much wider pH range (pH 3.0–7.5) over schwertmannite (pH 3.0–4.5). Based on the results of radical scavenger effect, H2O2 decomposition, Fe leaching and X-ray photoelectron spectroscopic (XPS) analysis, similar catalytic mechanisms were proposed in schwertmannite/H2O2 and jarosite/H2O2 systems, in which the induction period can be ascribed to the activation of catalysts by H2O2 and the second-stage was mainly attributed to the homogeneous Fenton reaction in bulk solution. During the catalytic degradation of phenol, catechol was firstly accumulated and was then further decomposed into smaller molecular organic acids. The repeated uses of schwertmannite and jarosite for phenol degradation manifested their stability and reusability as Fenton-like catalysts for the degradation of organic pollutants. © 2017 Elsevier B.V.


Yu D.,Nanjing Agricultural University | Yu D.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Ding Y.,Nanjing Agricultural University | Ma Y.,Nantong University
Zootaxa | Year: 2017

Molecular analysis and a detailed morphological comparison revealed that Tomocerus similis Chen & Ma was described from individuals belonging to several species from several localities. Based on both old and new material from Anhui and Jiangsu Provinces, China, T. similis is redescribed and two new species are described. The three species are morphologically similar. Tomocerus persimilis sp. nov. differs from the others by the presence of central macrochaeta on head and of several distinct distal inner teeth on unguis. Tomocerus dissimilis sp. nov. is characterised by pointed tenent hairs on anterior legs. Remarks are made on the systematics and ecology of the kinoshitai complex, and on the taxonomic value of tenent hair and its adjacent chaetae. © 2017 Magnolia Press.


Meng X.,Nanjing Agricultural University | Yan S.,Nanjing Agricultural University | Wu W.,Nanjing Institute of Environmental Sciences | Zheng G.,Nanjing Agricultural University | And 3 more authors.
RSC Advances | Year: 2017

Heterogeneous Fenton-like degradation of phenanthrene in aqueous solution was investigated using schwertmannite biosynthesized by Acidithiobacillus ferrooxidans LX5 as a catalyst. The effects of different reaction parameters including catalyst loading, H2O2 concentration, initial solution pH and inorganic anions on the Fenton-like degradation of phenanthrene were studied. Results showed that the biosynthesized schwertmannite had an effective catalytic ability on phenanthrene degradation. The degradation efficiency of phenanthrene was 99.0% within 3-5 h reaction under conditions of H2O2 200 mg L-1, schwertmannite 1 g L-1, phenanthrene 1 mg L-1 and pH 3.0-4.5. The degradation was mainly via a surface mechanism, in which phenanthrene was readily adsorbed on the surface of schwertmannite and then oxidized by OH produced from H2O2 decomposition. The XPS results of schwertmannite before and after Fenton-like degradation of phenanthrene revealed the change of Fe2+/Fe3+ species on the surface of schwertmannite. Moreover, phthalates, octadecanoic acid and 9,10-phenanthraquinone were identified by GC-MS analyses as the main intermediate compounds during phenanthrene degradation, and all the intermediates were finally mineralized. The repeated use of biosynthesized schwertmannite for phenanthrene degradation illustrated its stability and reusability as a Fenton-like catalyst. Therefore, schwertmannite biosynthesized using A. ferrooxidans is an excellent catalyst for the degradation of phenanthrene in heterogeneous Fenton-like reactions. © 2017 The Royal Society of Chemistry.


Wang X.,Yangzhou University | Wang X.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Liang G.,Jiangsu University
BioMed Research International | Year: 2014

We aimed to isolate and identify endophytic bacteria that might have efficacy against peanut bacterial wilt (BW) caused by Ralstonia solanacearum. Thirty-seven endophytic strains were isolated from healthy peanut plants in R. solanacearum-infested fields and eight showed antagonistic effects against R. solanacearum. Strain BZ6-1 with the highest antimicrobial activity was identified as Bacillus amyloliquefaciens based on morphology, biochemistry, and 16S rRNA analysis. Culture conditions of BZ6-1 were optimized using orthogonal test method and inhibitory zone diameter in dual culture plate assay reached 34.2 mm. Furthermore, main antimicrobial substances of surfactin and fengycin A homologues produced by BZ6-1 were analyzed by high performance liquid chromatography electrospray ionization tandem mass spectrometry. Finally, pot experiments were adopted to test the control efficiency of BZ6-1 against peanut BW. Disease incidence decreased significantly from 84.5% in the control to 12.1% with addition of 15 mL (108 cfu mL-1) culture broth for each seedling, suggesting the feasibility of strain BZ6-1 in the biological control of peanut plants BW. © 2014 Xiaobing Wang and Guobin Liang.


Wang Z.,Nanjing Agricultural University | Zheng G.,Nanjing Agricultural University | Zheng G.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Zhou L.,Nanjing Agricultural University | Zhou L.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization
Bioresource Technology | Year: 2015

Mechanisms responsible for the sludge dewaterability enhanced by filamentous fungi during fungal treatment of sludge were investigated in the present study. The filamentous fungus Mucor sp. GY-1, isolated from waste activated sludge, enhanced sludge dewaterability by 82.1% to achieve the lowest value of normalized sludge specific resistance to filtration (SRF), 8.18×1010m·L/kg·g-TSS. During the fungal treatment of sludge, 57.8% of slime extracellular polymeric substances (EPS) and 51.1% of polysaccharide in slime EPS were degraded, respectively, by Mucor sp. GY-1, contributing to the improvement of sludge dewaterability. Slime EPS is much more available for Mucor sp. GY-1 than either LB-EPS or TB-EPS that bound with microbial cells. In addition, filamentous fungus Mucor sp. GY-1 entrapped small sludge particles and inhibited the destruction of sludge flocs larger than 100μm, thus enhancing sludge dewaterability, during fungal treatment of sludge using Mucor sp. GY-1. © 2015 Elsevier Ltd.


Zhao J.,Key Laboratory of Plant Nutrition and Fertilization in Low Middle Reaches of the Yangtze River | Zhao J.,Nanjing Agricultural University | Zhang R.,Key Laboratory of Plant Nutrition and Fertilization in Low Middle Reaches of the Yangtze River | Zhang R.,Nanjing Agricultural University | And 13 more authors.
Microbial Ecology | Year: 2014

Microbes are key components of the soil environment, playing an important role in maintaining soil health, sustainability, and productivity. The composition and structure of soil bacterial communities were examined in winter wheat-rice (WR) and winter wheat-maize (WM) cropping systems derived from five locations in the Low-Middle Yangtze River plain and the Huang-Huai-Hai plain by pyrosequencing of the 16S ribosomal RNA gene amplicons. A total of 102,367 high quality sequences were used for multivariate statistical analysis and to test for correlation between community structure and environmental variables such as crop rotations, soil properties, and locations. The most abundant phyla across all soil samples were Proteobacteria, Acidobacteria, and Bacteroidetes. Similar patterns of bacterial diversity and community structure were observed within the same cropping systems, and a higher relative abundance of anaerobic bacteria was found in WR compared to WM cropping systems. Variance partitioning analysis revealed complex relationships between bacterial community and environmental variables. The effect of crop rotations was low but significant, and interactions among soil properties, locations, and crop rotations accounted for most of the explained variation in the structure of bacterial communities. Soil properties such as pH, available P, and available K showed higher correlations (positive or negative) with the majority of the abundant taxa. Bacterial diversity (the Shannon index) and richness (Chao1 and ACE) were higher under WR than WM cropping systems. © 2013 Springer Science+Business Media New York.


Liu T.,Nanjing Agricultural University | Liu T.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Liu T.,McGill University | Chen X.,Nanjing Agricultural University | And 7 more authors.
Agriculture, Ecosystems and Environment | Year: 2016

Organic fertilizer applications that boost soil fertility and crop production are expected to enhance soil biodiversity, making ecosystems more resilient to stress. Numerous studies have compared biodiversity in soil receiving organic fertilizer to soil under other fertilizer regimes (inorganic fertilizers, unfertilized), yet the data were not analyzed systematically across studies. We evaluated fertilizer effects on soil nematode communities with a meta-analysis of more than 229 data points from 54 studies around the world that were published between 1996 and 2015. Data were from cropland and considered five fertilizer regimes. These regimes include unfertilized soils and those receiving inorganic fertilizers (2 regimes), as well as organic fertilizers (2 regimes). Species richness and total nematode abundance increased with increasing carbon (C) inputs from fertilizers, whereas greater nitrogen (N) application rates from fertilizers significantly reduced the species richness, Shannon's diversity (H′), maturity index (MI) and omnivore-predator nematode abundance. This could indicate that high fertilizer N inputs simplifies the nematode community structure and functions. Species richness, omnivore-predator nematode abundance and structural index (SI) increased with the organically-fertilized regime and declined in inorganically-fertilized regimes, suggesting that organic fertilizers can buffer stresses and sustain soil food web functions. Furthermore, organic fertilizers differed in their impact on soil nematodes, as those with C-rich crop residues supported larger free-living nematode populations and greatly promoted H′, SI and enrichment index (EI), whereas N-rich animal manure was more effective in controlling plant-feeding nematodes. Our review suggests that the application of C-rich crop residues is the most effective practice to enhance soil biodiversity in intensively managed agroecosystems, highlighting the importance of regular applications of straw and other C-rich residues to preserve the ecological resilience of cropland. © 2016 Elsevier B.V.


Zhou J.,Nanjing Agricultural University | Zhou J.,Nanjing University of Technology | Zheng G.,Nanjing Agricultural University | Zheng G.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | And 3 more authors.
PLoS ONE | Year: 2014

Extracellular polymeric substances (EPS) play important roles in regulating the dewaterability of sludge. This study sought to elucidate the influence of EPS on the dewaterability of sludge during bioleaching process. Results showed that, in bioleaching system with the co-inoculation of Acidithiobacillus thiooxidans TS6 and Acidithiobacillus ferrooxidans LX5 (A. t+A. f system), the capillary suction time (CST) of sludge reduced from 255.9 s to 25.45 s within 48 h, which was obviously better than the controls. The correlation analysis between sludge CST and sludge EPS revealed that the sludge EPS significantly impacted the dewaterability of sludge. Sludge CST had correlation with protein content in slime and both protein and polysaccharide contents in TB-EPS and Slime+LB +TB layers, and the decrease of protein content in slime and decreases of both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers improved sludge dewaterability during sludge bioleaching process. Moreover, the low sludge pH (2.92) and the increasing distribution of Fe in the solid phase were another two factors responsible for the improvement of sludge dewaterability during bioleaching. This study suggested that during sludge bioleaching the growth of Acidithiobacillus species resulted in the decrease of sludge pH, the increasing distribution of Fe in the solid phase, and the decrease of EPS content (mainly including protein and/or polysaccharide) in the slime, TB-EPS, and Slime+LB+TB layers, all of which are helpful for sludge dewaterability enhancement. © 2014 Zhou et al.


Yu D.,Nanjing Agricultural University | Yu D.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Li Y.,Guangxi Normal University
Zootaxa | Year: 2016

Three new troglobitic species of Tomocerus are described from the southwestern karsts of China. All of them have well developed postantennal organs. Tomocerus dong sp. nov. is similar to Tomocerus postantennalis Yu, Zhang & Deharveng and Tomocerus deharvengi sp. nov., but is different from them mainly in the number of prelabral chaetae and the dorsal body chaetotaxy. T. deharvengi sp. nov. is very similar to T. postantennalis but differs from the latter in the cephalic chaetotaxy, the number of manubrial pseudopores and the number of dental spines. T. cthulhu sp. nov. is peculiar for the multi-furcated vesicles of ventral tube, and is different from the three aforementioned species mainly in the dorsal body chaetotaxy. The position of the new species and the relationships between them are discussed. Copyright © 2016 Magnolia Press.


Huo M.,Nanjing Agricultural University | Zheng G.,Nanjing Agricultural University | Zheng G.,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization | Zhou L.,Nanjing Agricultural University
Bioresource Technology | Year: 2014

Contribution rates of factors controlling sludge dewaterability during bioleaching, such as sludge pH, microbial quantity, extracellular polymeric substances (EPS), etc., were investigated in this study. Results showed that the dewaterability of bioleached sludge was jointly enhanced by the growth of Acidithiobacillus sp., the increase of Fe3+ concentration, the decreases of sludge pH, heterotrophic microorganism quantity change, and the decreases of EPS and bound water contents. Ridge regression analysis further revealed that the contribution rates of microbial quantity change, bound water content and slime EPS content on sludge dewaterability enhancement were 32.50%, 24.24%, and 22.37%, respectively, all of which are dominant factors. Therefore, the enhancement of sludge dewaterability was mainly controlled by microbial quantity change and the decrease of bound water and slime EPS contents during bioleaching. © 2014 Elsevier Ltd.

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