Biodegradation of polyvinyl alcohol by different dominant degrading bacterial strains in a baffled anaerobic bioreactor

2019 ◽  
Vol 79 (10) ◽  
pp. 2005-2012
Author(s):  
H. F. Wu ◽  
L. Z. Yue ◽  
S. L. Jiang ◽  
Y. Q. Lu ◽  
Y. X. Wu ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Degradation Products ◽  
Degradation Pathway ◽  
Synergistic Action ◽  
Ecological Environment ◽  
Bacterial Strains ◽  
Anaerobic Bioreactor ◽  
The Sustainable Development ◽  
Intracellular Enzymes ◽  
Fatty Acids And Alcohols

Abstract Polyvinyl alcohol (PVA) is the main pollutant in printing and dyeing wastewaters. This pollutant exhibits great demand, poor biodegradability and refractory degradation. In this study, PVA wastewater treatment experiments were conducted in a stably operating baffled anaerobic bioreactor (ABR) by using simulated PVA wastewater. The PVA degradation pathway and mechanism of the mixed dominant PVA-degrading bacterial strains were identified through the analysis of their degradation products. From the results, we inferred that PVA was degraded in a stepwise process under the synergistic action of different extracellular and intracellular enzymes produced by the mixed dominant PVA-degrading bacterial strains. In this process, PVA was first degraded into ketones, fatty acids and alcohols. It was then regenerated into acetic acid, hydrogen and carbon dioxide. Finally, these substances could be further utilized by methanogens. PVA was thus degraded completely. This study may serve as a reference for future works on the degradation of PVA in the ecological environment. It may also guide the sustainable development of PVA.

scholarly journals Application Research Based on Ecological Environment and Environmental Protection Technology

2020 ◽  
Vol 165 ◽  
pp. 02016
Author(s):  
Ditong Zhu ◽  
Yingchun Wang
Keyword(s):  
Environmental Protection ◽  
Ecological Environment ◽  
Source Control ◽  
Human Beings ◽  
The Sustainable Development ◽  
Protection Technology ◽  
Important Means ◽  
Scientific Decision ◽  
Environment Detection ◽  
Big Data Technology

Ecological environment detection and environmental protection technology becomes an important means to ensure the sustainable development of human beings. Under the premise of the common development of the world’s environmental protection, environmental protection is becoming more and more important. Under the background of the development of science and technology, human beings should also fundamentally solve the ecological environmental protection problem. At the same time, multi-domain ecological environment monitoring data will be used to improve the data processing technology capacity to meet the government’s multi-source control needs and improve the government’s scientific decision-making effect. Starting from the significance of applying ecological environment detection and environmental protection technology, this paper explores and defines the problems existing in the ecological environment detection and environmental protection technology, and puts forward corresponding optimization strategies in combination with big data technology for reference.

scholarly journals Biodegradation of 5-(Hydroxymethyl)-furfural and Furan Derivatives

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1283 ◽  
Author(s):  
María Isabel Igeño ◽  
Rubén Sánchez-Clemente ◽  
Ana G. Población ◽  
M. Isabel Guijo ◽  
Faustino Merchán ◽  
...  
Keyword(s):  
Furan Ring ◽  
Degradation Products ◽  
Chemical Compounds ◽  
Aldehyde Group ◽  
Bacterial Strains ◽  
Fermentation Inhibitors ◽  
Furan Derivatives ◽  
Hydroxymethyl Furfural ◽  
Common Thread ◽  
Lignocellulose Hydrolysates

Furfural and 5-hydroxymethylfurfural (HMF) are degradation products of lignocellulose during pretreatment operations. Furfural compounds are a group of chemical compounds whose common thread is an aldehyde group attached to a furan ring, and they constitute a problem for the development of second-generation biofuels because they act as fermentation inhibitors of the lignocellulose hydrolysates. Up to date, very few bacteria have been described to be able to eliminate them. The objective of this work was to isolate and characterize bacterial strains able to use, as the sole carbon source, 5-(hydroxymethyl)-furfural (HMF) and furan derivatives.

A Study on Urban Low-Carbon Landscape Construction

2010 ◽  
Vol 129-131 ◽  
pp. 42-45
Author(s):  
Li Fang Qiao ◽  
Lei Feng ◽  
Lian Fang Yao ◽  
Xin Zheng Li
Keyword(s):  
Sustainable Development ◽  
Urban Landscape ◽  
Landscape Planning ◽  
Carbon Sink ◽  
Landscape Design ◽  
Ecological Environment ◽  
Source Control ◽  
Low Carbon ◽  
The Sustainable Development ◽  
Carbon Policy

The landscape industry has become one of the industries with higher resource and energy consumption, and the implementation of urban low-carbon landscape construction is of great significance to improve the ecological environment. In this study, the method of low-carbon landscape construction was studied from two aspects including the carbon source control and carbon sink, as well as both direct and indirect effect. The results showed that the low-carbon landscape construction can be controlled from five aspects including landscape planning, landscape design, low-carbon landscape technology, low-carbon landscape behavior and low-carbon policy. Through a series of low-carbon measures, carbon emissions can be controlled at a reasonable level during the urban landscape construction, which also promotes the sustainable development of urban ecological environment.

scholarly journals Intracellular serine proteinase of Bacillus subtilis strain Marburg 168. Comparison with the homologous enzyme from Bacillus subtilis strain A-50

1979 ◽  
Vol 179 (2) ◽  
pp. 333-339 ◽  
Author(s):  
A Y Strongin ◽  
D I Gorodetsky ◽  
I A Kuznetsova ◽  
V V Yanonis ◽  
Z T Abramov ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Serine Proteinase ◽  
Subtilis Strain ◽  
Bacterial Strains ◽  
Terminal Sequence ◽  
Gramicidin S ◽  
Intracellular Enzymes ◽  
Sepharose 4B ◽  
Homologous Enzyme ◽  
Strict Selection

Intracellular serine proteinase was isolated from sporulating cells of Bacillus subtilis Marburg 168 by gramicidin S-Sepharose 4B affinity chromatography. The enzymological characteristics, the amino acid composition and the 19 residues of the N-terminal sequence of the enzyme are reported. The isolated proteinase was closely related to, but not completely identical with, the intracellular serine proteinase of B. subtilis A-50. The divergence between these two intracellular enzymes was less than that between the corresponding extracellular serine proteinases (subtilisins) of types Carlsberg and BPN′!, produced by these bacterial strains. This may be connected with the more strict selection constraints imposed in intracellular enzymes during evolution.

scholarly journals Synthesis and Characterization of a Bioartificial Polymeric System with Potential Antibacterial Activity: Chitosan-Polyvinyl Alcohol-Ampicillin

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3109 ◽  
Author(s):  
Andres Bernal-Ballen ◽  
Jorge Lopez-Garcia ◽  
Martha-Andrea Merchan-Merchan ◽  
Marian Lehocky
Keyword(s):  
Antibacterial Activity ◽  
Polyvinyl Alcohol ◽  
Statistical Significance ◽  
Antibacterial Properties ◽  
Intermolecular Forces ◽  
Polymeric System ◽  
Bacterial Strains ◽  
Natural Polymers ◽  
The Matrix ◽  
The Individual

Bio-artificial polymeric systems are a new class of polymeric constituents based on blends of synthetic and natural polymers, designed with the purpose of producing new materials that exhibit enhanced properties with respect to the individual components. In this frame, a combination of polyvinyl alcohol (PVA) and chitosan, blended with a widely used antibiotic, sodium ampicillin, has been developed showing a moderate behavior in terms of antibacterial properties. Thus, aqueous solutions of PVA at 1 wt.% were mixed with acid solutions of chitosan at 1 wt.%, followed by adding ampicillin ranging from 0.3 to 1.0 wt.% related to the total amount of the polymers. The prepared bio-artificial polymeric system was characterized by FTIR, SEM, DSC, contact angle measurements, antibacterial activity against Staphylococcus aureus and Escherichia coli and antibiotic release studies. The statistical significance of the antibacterial activity was determined using a multifactorial analysis of variance with ρ < 0.05 (ANOVA). The characterization techniques did not show alterations in the ampicillin structure and the interactions with polymers were limited to intermolecular forces. Therefore, the antibiotic was efficiently released from the matrix and its antibacterial activity was preserved. The system disclosed moderate antibacterial activity against bacterial strains without adding a high antibiotic concentration. The findings of this study suggest that the system may be effective against healthcare-associated infections, a promising view in the design of novel antimicrobial biomaterials potentially suitable for tissue engineering applications.

scholarly journals Analysis on the Development Trend of Marine Fishery Governance

2020 ◽  
Vol 9 (7) ◽  
pp. 32
Author(s):  
Zhi Chen ◽  
Chaojie Yang ◽  
Wubo Wan ◽  
Yongzhen Liu ◽  
Zhenbo Chen ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Development Trend ◽  
Marine Ecology ◽  
Ecological Environment ◽  
Marine Fisheries ◽  
The Sustainable Development ◽  
Marine Fishery ◽  
Marine Economy ◽  
Fishery Governance ◽  
The Development Trend

Marine fishery is an important part of China’s economic development. Marine fishery is not only related to the development of marine economy, but also the marine ecological environment. It is very important to promote the competitiveness of marine fisheries, protect marine ecology, and explore the sustainable development of marine fisheries. In this regard, this article analyzes the development trend of marine fisheries, analyzes the current problems in marine fishery governance, and explores effective countermeasures for the development of marine fishery governance, hoping to provide some ideas for promoting marine fishery governance and enhancing the benefits of marine fishery development.

scholarly journals DYNAMIC STATE OF ECOSYSTEM CARRYING CAPACITY UNDER ISLAND URBANIZATION: A CASE STUDY OF PINGTAN ISLAND IN THE SOUTHEASTERN COAST OF CHINA

2020 ◽  
Vol 28 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Sheng Gao ◽  
Huihui Sun ◽  
Guangxi Cao ◽  
Lin Zhao ◽  
Runjie Wang ◽  
...  
Keyword(s):  
Sustainable Development ◽  
Carrying Capacity ◽  
Large Scale ◽  
Assessment Method ◽  
Dynamic State ◽  
Ecological Environment ◽  
The Sustainable Development ◽  
Rational Development ◽  
Pingtan Island

The assessment of ecological environment during the large-scale development of islands is a major topic in the study of current coastal islands. Choosing the appropriate assessment method to evaluate the suitability of carrying capacity of islands and making relevant suggestions are significant to the sustainable development of islands. Ecological footprint method is used to analyze the ecological carrying capacity of Pingtan Island (PI) from 2005 to 2016 for promoting the coordinated rational development and construction and ecological environment of the island. Although PI is in rapid urban development and construction, the island maintains secure and stable ecological conditions. PI is used as a research case to analyze the sustainable development of the ecological environment through the carrying capacity of the island ecosystem.

scholarly journals Biodegradation of two organic UV-Filters by single bacteria strains

2021 ◽  
Author(s):  
Florentina Laura Chiriac ◽  
Catalina Stoica ◽  
Iuiana Paun ◽  
Florinela Pirvu ◽  
Toma Galaon ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Emerging Contaminants ◽  
Degradation Products ◽  
Aquatic Organisms ◽  
Uv Filters ◽  
Bacterial Strains ◽  
Gram Negative ◽  
Biodegradation Process ◽  
Salmonella Thyphimurium ◽  
Organic Uv Filters

Abstract Organic UV-filters, including 4-hydroxybenzophenone (4-HBP) and 2,4-dihydroxybenzophenone (BP-1), are persistent emerging contaminants whose presence in the environment poses a threat to aquatic organisms due to their endocrine disruptor’s properties. For this reason, finding suitable technological processes for their safety and efficient removal from the environment represent a priority for the scientific community. To the author’s knowledge, until now, there are no studies reporting the biodegradation of 4-HBP and BP-1 by a single bacteria strain. In this paper, there were tested the 4-HBP and BP-1 biodegradation potential of two Gram-positive (Staphylococcus aureus and Enterococcus faecalis) and two Gram-negative (Salmonella typhimurium and Serratia rubidae). The 4-HPB biodegradation process was observed only in the presence of Gram-negative bacterial strains. Thus, the biodegradation rates of 4-HBP reached up to 12.7% after 24h of incubation in presence of Salmonella thyphimurium and up to 24.0% after 24h of incubation with Serratia rubidae. Staphylococcus aureus was able to biodegrade 26.7% of BP-1, while Salmonella thiphymurium was able to biodegrade 14.7% of BP-1 after 24h of incubation. Their biodegradation products generated during the 4-HBP biodegradation process by Serratia rubidae were analyzed through LC-MS/MS analysis. The (bio)degradation products were benzophenone and a multi-hydroxylated derivative of 4-HBP and the degradation pathways were proposed. The data obtained in this study gave important information regarding the 4-HBP and BP-1 potential biodegradation by single bacterial strains.

A Paradigm of Constructing Industrial Symbiosis and Coupling in China’s County-Region Economic Sustainable Development

2013 ◽  
pp. 1218-1231
Author(s):  
Guangming Li
Keyword(s):  
Sustainable Development ◽  
Local Government ◽  
Value Added ◽  
Economic Incentives ◽  
Environmental Cost ◽  
Ecological Environment ◽  
Industrial Symbiosis ◽  
The Sustainable Development ◽  
Industrial Chain ◽  
Recycle Economy

This chapter introduces the sustainable development of county-region economy under the constraint of natural resources and environment in China when parts of classic industries along the south-eastern coast are shifting to the poorer mountain areas and middle-western areas. It argues that the county regional economic development at the stage should focus on the agricultural growing and breeding their processing sectors, natural resource exploitation and its processing, manufacturing, tourism, and ecological industrial (shift) park, according to the resource endowment. The local government should guide the scientific planning of county-region industries’ layout, structure, symbiosis, and coupling relationships. By means of environmental cost internalization, region industries’ symbiosis and coupling size, roles of social network, cultivation of innovative culture, guidance of government subsidy, pressure from public monitoring, the market mechanism, and economic incentives will play roles in resource allocation. In practice, the local government or industrial authority can design the “lack in” value chain parts and package them into some feasible and profitable projects open to the market investors, encourage firms to participate regional industrial symbiosis and coupling, and construct a complete industrial chain or network, in order to realize the integration of closed-circuit industry, higher value-added ecological agriculture, tourism and related service sectors, creative economic industrial park, urbanization, and ecological environment. This will avoid the heavy-damage from traditional industrialization and urbanization on county-regional ecological environment, and then realize the harmony development of county-regional recycle economy, society, and environment.

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