ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2020
·Vol. 192
·期 6
·1-11
·
IF 1.903
Zagui Guilherme Sgobbi,de Andrade Leonardo Neves,Moreira Natália Columbaro,Silva Thaís Vilela,Machado Gabriel Pinheiro,da Costa Darini Ana Lúcia,Segura-Muñoz Susana Inés
Multidrug resistance mediated by β-lactamase in Gram-negative bacilli is a serious public health problem. Sewers are considered reservoirs of multiresistant bacteria due to presence of antibiotics that select them and favor their dissemination. The present study evaluated the antibiotic resistance profile and β-lactamases production in Gram-negative bacilli isolates from hospital sewage and urban wastewater treatment plants (UWWTP) in Brazil. Bacteria were isolated and identified with biochemical tests. Antibiotic susceptibility testing was performed by the disk-diffusion method and detection of extended-spectrum β-lactamase and carbapenemases by enzymatic inhibitor and conventional PCR. Differences in resistance to amoxicillin clavulanic, aztreonam, cefepime, and cefotaxime were observed in hospital sewage compared with urban sewage ( p < 0.05). The multidrug-resistant phenotype was observed in 33.3% of hospital sewage isolates ( p = 0.0025). β-lactamases genes were found in 35.6% of isolates, with the most frequent being bla KPC and bla TEM (17.8%), and bla SHV and bla CTX-M (13.3% and 8.9%, respectively). The data obtained are relevant, since the bacteria detected are on the priority pathogens list from the World Health Organization and hospital sewage could be released untreated into the municipal collection system, which may favor the spread of resistance. Changes in hospital sewage discharge practices, as well as additional technologies regarding effluent disinfection in the UWWTP, can prevent the spread of these bacteria into the environment and negative impact on water resources.
研究领域:
微生物学
·
公共卫生
·
环境科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Jingyi Zhang,Zuxin Xu,Wenhai Chu,Liping Ma,Huan He,Wei Jin,Chao Fang
The severely low influent chemical oxygen demand (COD) concentration at wastewater treatment plants (WWTPs) has become a critical issue. A key factor is the excessive biodegradation of organic matter by microbial communities within sewer systems. Intense disinfection commonly adopted for medical wastewater leads to abundant residual chlorine entering sewers, likely causing significant changes in microbial communities and sewage quality in sewers, yet our understanding is limited. Through long-term sewer simulation batch tests, this study revealed the response mechanism of microbial communities to residual chlorine and its impact on organic matter concentration in sewage. Under residual chlorine stress, microbial community structure rapidly changed, and more complex microbial interactions were observed. Besides, pathways related to stress response such as two-component system were significantly enriched; pathways related to energy metabolism (such as carbon fixation in prokaryotes and citrate cycle) in microbial communities were inhibited, and carbon metabolism shifted from the Embden-Meyerhof pathway to the pentose phosphate pathway to enhance cellular reducing power, reduce oxidative stress, and consequently decrease organic matter degradation. Therefore, compared to sewers with normal disinfection, concentrations of COD and dissolved organic carbon in sewage under chlorine stress increased by 12.6 % and 7.4 %, respectively. Besides, the decay and transformation of residual chlorine in sewers were explored. These findings suggest a new approach to medical wastewater discharge management: placing the medical wastewater outlet at the upstream in sewer systems, which ensures that residual chlorine consumption reaches maximum during long-distance transportation, mitigating its harmful effects on WWTPs, and increases the influent organic matter concentration, thereby reducing the need for additional carbon sources.
研究领域:
环境工程
·
微生物学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 9
·11572-11585
·
IF 3.056
Zou Yanghuan,Ye Chenli,Pan Yongzhang
Wastewater treatment plants (WWTPs) have been proposed as significant sources of microplastics (MPs) in freshwater and estuarine environments. WWTPs, even those with high removal efficiencies, release millions of MPs per plant daily. China is the largest plastic producer worldwide, but only a few studies of MP pollution from WWTPs have been carried out in China. In this work, we present a comprehensive report concerning the MPs in effluent from six WWTPs in Guangzhou, which is the third largest city in China. The six WWTPs employ different treatment processes and serve different populations and types of factories. The average abundance of MPs in the effluents of all six WWTPs was 1.719 ± 1.035 MP/L. Fiber was the most common type of MP in the effluent, accounting for 39.48 ± 6.37% of all MPs. Fourier transform infrared spectroscopy confirmed that 35.7% of the particles were plastics, including polyethylene terephthalate (31.9%), polypropylene (26.6%), and polyethylene (9.7%). The results showed that advanced or tertiary treatment technologies could substantially remove MPs and that the size of the population served was positively associated with the abundance of MPs. The number of textile factories was a key factor contributing to the total release of MPs. In addition, the MP shapes and polymer compositions showed that the occurrence of MP types is regional, varies regionally, and is related to the types of factories in the vicinity. More studies on the effects of specific industries are suggested in order to improve the management of wastewater discharge and reduce MPs presence in the natural environment.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2021
·Vol. 13
·期 2
·1199-1211
·
IF 4.987
Fahim Raana,Xiwu Lu,Jilani Ghulam,Ali Farasat
The inadequate sanitation, global warming, and dwindling natural oil reserves pose significant threats to global sustainable growth. With this objective, biomass availability for bioenergy production could be ensured alternately by exploring non-conventional plant species and algae. This idea was examined by growing divergent plants and algae species separately in horizontal subsurface flow constructed wetlands and raceway ponds, later collected their biomass for bioethanol determination. Through this approach, sewage was fed to constructed wetlands and raceway ponds as influent and passed through these cultivated systems for wastewater treatment. Although all the four plant and algae species showed efficient results in sewage treatment, however, Ipomoea aquatica and Spirogyra were statistically superior to the others and produced the highest biomass yield of 4.5 and 4.1 kg m −2 , respectively. For bioethanol production, alkali–autohydrolysis combined pretreatment followed by enzymatic hydrolysis with two successive incubation periods (12 and 24 h) were employed. Results suggested that Spirogyra biomass rendered greater carbohydrate and ethanol concentration (3.7 and 1.9 mg L −1 , respectively) during 24 hours of incubation, whereas Oryza sativa acquired similar carbohydrate concentration as Spirogyra but slightly lower bioethanol yield. This study postulates, Spirogyra is promising for wastewater treatment coupled with bioethanol production. Graphical abstract
Open raceway pond and constructed wetland coupled with wastewater treatment and bio-ethanol production
研究领域:
环境科学
·
生物能源
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Yan-Qin Yang,Min-Hua Cui,Jian-Chao Guo,Jing-Jing Du,Zhi-Yong Zheng,He Liu
In this study, biochars were produced by co-pyrolysis of rice husk and sewage sludge, the environmental risk of heavy metal (Pd and Cd) in the biochars was assessed. Co-pyrolysis resulted in a lower yield but a higher C content compared with sewage sludge pyrolysis alone, the relative contents of Pb and Cd in biochars were declined. Co-pyrolysis process transformed the bioavailable heavy metals into stable speciation. The environmental risk assessment codes of Pb and Cd were reduced by 1–2 grades. The co-pyrolysis technology provides a feasible method for the safe disposal of heavy metal-contaminated sewage sludge.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 4
·1014-1024
·
IF 3.4
Diantong Li,Jiayu Li,Balijiang Yeerhazi,Yongtao Cheng
BACKGROUND With the rapid development of modern industry and agriculture, large amounts of sewage of various types are being discharged into water bodies every year, causing huge environmental pressure and posing a threat to organisms. Amongst different solutions to this problem, microalgae can remove pollutants including pesticides and antibiotics from water . In this work, an algal strain designated as Scenedesmus sp. TXH. was isolated from the Tangxun Lake Sewage Treatment Plant (Wuhan, China) and used to remove imidacloprid (IMI) from sewage. The removal efficiency, degradation products, removal of conventional contaminants [total dissolved nitrogen (TDN) ammonia nitrogen (NH 4 + -N), total dissolved phosphorus (TDP)], the biochemical response of the microalgae, and the effects of environmental factors such as light intensity and temperature were investigated. RESULTS The results showed that: (i) the highest IMI removal efficiency of ≈60% was achieved under 80 μmol m −2 s −1 at 25 °C; (ii) the removal of NH 4 + -N, TDP and TDN in the sewage reached 90%, 90% and 65%, respectively; (iii) there was a significant linear relationship between the concentration of total chlorophyll and the removal of IMI in the sewage; and (iv) finally, based on the analysis of degradation products by mass spectrometer, three potential IMI degradation pathways were proposed. CONCLUSION In summary, our results showed that Scenedesmus sp. TXH can remove IMI and conventional nutrients efficiently from sewage, implying a potential application in sewage treatment in the near future. © 2023 Society of Chemical Industry (SCI).
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
SENSORS
·
2022
·Vol. 22
·期 20
·7952
·
IF 3.847
Yueshui Lyu,Yingying Shi,Sen Zhu,Yuan Jia,Chunfeng Tong,Shixiong Liu,Bo Sun,Jingxiang Zhang
In recent years, hazardous wastewater treatment has been a complex and global problem. In this work, by considering the antimicrobial activity of Ag nanoparticles (AgNPs) and reduced graphene oxide (rGO), we constructed an antibacterial device (G-AgNP) with AgNPs conformably deposited onto a 3D scaffold of reduced graphene oxide in situ. The major limitation, which is difficult to recycle, of two-dimensional graphene-silver composite materials in previous studies is improved. Characterization techniques, SEM, TEM, XRD, and XPS, confirmed the synthesis of nanocomposites. Attributed to its larger specific area, more active sites, and synergistic enhancement, the G-AgNP device demonstrated the best bacterial removal capacity, with an antibacterial rate for bothE. coliandS. aureusas high as 100% at quite low AgNP contents. The reported G-AgNP has potential application as a wearable sewage treatment device and for the protection of wearable sensors as a promising sterilizing candidate based on its high and stable antibacterial efficiency.Keywords:antibacterial device;Ag nanoparticles;graphene;sewage treatment
研究领域:
材料科学
·
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2025
·
IF 9.4
Xiaoluan Lu,Xiaoqian Ma,Zhaosheng Yu,Yunlong Tian,Xinfei Chen,Feng Hong,Zhenjun Gao
Mitigating heavy metals (HMs) risk while improving fuel properties remains an important challenge in solid fuel production. Hence, ferric citrate (FC) was selected as an additive to analyse its effect on co-hydrothermal carbonization (HTC) of sewage sludge (SS) and corncob (CC). SS and CC were converted to hydrochar at 230–260 °C and its chemical forms of HMs as well as fuel properties were evaluated. Results showed that temperature profoundly affects the influence of FC. At 260 °C and with the help of FC, a low ecological risk index was obtained. The fuel ratio, higher calorific value and combustion performance of hydrochar from co-HTC were enhanced and improved compared to hydrochar from SS. Additionally, FC further promoted dehydration and decarboxylation reactions. This study demonstrates that co-HTC with FC assisted is a viable strategy for producing high-quality biofuel with mitigated HM risks.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 10
·2812-2822
·
IF 2.5
Li Chen,Liu Jing,Lou Guanchen,Yu Chuning
View large Download slide View large Download slide Close modal The sequential extraction routes of biogenic materials from sewage sludge (SS) were investigated. Physical methods (ultrasound, heating) and chemical methods (sodium hydroxide, sodium carbonate) were used to extract extracellular polymeric substances (EPS) and alginate-like extracellular polymers (ALEs) from SS. The residues after extraction were further subjected to physical methods (heating) and chemical methods (sulfuric acid, sodium hydroxide) for protein extraction. A comparison was made between sequential extraction routes and direct extraction of biomaterials from sludge in terms of extraction quantity, material properties, and applicability. The results showed that sequential extraction of biomaterials is feasible. The highest extraction quantities were obtained when using sodium carbonate for EPS and ALE extraction and sodium hydroxide for protein, reaching 449.80 mg/gVSS, 109.78 mg/gVSS, and 5447.08 mg/L, respectively. Sequential extraction procedures facilitate the extraction of biomaterials. Finally, suitable extraction methods for different application scenarios were analyzed. Reported sequential extraction route of biomaterials from sludge. Sequential extraction enhanced the release of biomaterials. Appropriate extraction methods for different scenarios are clarified.
研究领域:
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2025
·Vol. 17
·期 4
·574
·
IF 3
Yanjing Zhu,Sijia Yang,Mathias Gustavsson,Wenli Huang,Si Gao,Rui Wang
Wastewater treatment plants (WWTPs) play a crucial role in mitigating microplastic (MP) release to the environment. In this paper, a WWTP of a textile manufacturing plant in Guangdong, China, was investigated to identify MP characteristics and the effectiveness of wastewater treatment within the plant. Laser Direct Infrared (LDIR) and Liquid Chromatography with Mass Spectrometry (LC-MS/MS) were applied to quantify both the number and the mass of the microplastics in the effluent of the textile manufacturing plant where most of the wastewater were from three printing and dyeing lines. The study further investigated the MP removal efficiency of each wastewater treatment process of the industry-owned WWTP and analysed the removal mechanism of each step, highlighting limitations in detecting and eliminating MPs. It is observed that (1) the results from LDIR and LC-MS/MS can be complementary to each other; (2) the MP concentration in the influent was 1730 n/L by number and 13.52 µg/L by mass; (3) the total removal efficiency of the WWTP were 99% by the number of MPs and 67.7% by the mass of MPs; (4) nine types of polymers have been identified in the influent, of which Polyamide (PA) was dominating; (5) hydrolysis acidification removed PA most; (6) aerobic tank, sand filter, and biological aerated filter (BAF) showed low removal efficiency; (7) coagulation and sedimentation tank had the highest removal efficiency to PET than any other processes.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhang Sinan,Wang Jihong,Wang Shuhua,Leng Su
Contamination of chlortetracycline (CTC) in water is a global problem that needs to be addressed urgently. Biochar immobilization of microorganisms is an effective way to remove CTC contamination from sewage. In this study, the CTC removal effect of free bacteria LZ01 and erding medicine residues biochar immobilized LZ01 was compared by shake flask batch experiments. The results showed that immobilized LZ01 significantly improved the CTC removal rate by 15.27% compared to free LZ01. The immobilization of LZ01 also significantly improved the environmental tolerance and the reusability and storage stability of strain LZ01. The optimal conditions for CTC removal (83.83%) by immobilized LZ01 were determined by response surface methodology: temperature of 33.98 °C, pH of 7.84, initial CTC concentration of 73.75 mg/L, and inoculation dose of 0.51% (w/v). The experimental results of treating CTC from simulated sewage showed that the immobilized LZ01 could remove more than 64% of CTC from the sewage. The ion of Cu 2+ accelerated the removal of CTC by immobilized LZ01, and the removal rates could reach 81.07%, 85.07%, and 87.50% in three sewages, i.e., river sewage, pond water, and farming wastewater, respectively. This study provides a feasible, effective, and rapid biological removal technique for the treatment of CTC pollution in sewage.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Jun Zhang,Ze-hua Liu,Jia-le Wu,Yu-ting Ding,Qing-guang Ma,Waseem Hayat,Yun Liu,Peng-jie Wang,Zhi Dang,Bruce Rittmann
Natural estrogen conjugates play important roles in municipal wastewater treatment plant (WWTP), but their deconjugation potentials are poorly understood. This work is the first to investigate the relationships between the enzyme activities of arylsulfatase/β-glucuronidase and deconjugation potentials of natural estrogen conjugates. This work led to three important findings. First, the enzyme activity of β-glucuronidase in sewage is far higher than that of arylsulfatase, while their corresponding activities in activated sludge were similar. Second, a model based on β-glucuronidase could successfully predict the deconjugation potentials of natural estrogen glucuronide conjugates in sewage. Third, the enzyme activity of arylsulfatase in sewage was too low to lead to evident deconjugation of sulfate conjugates, which means that the deconjugation rate of estrogen sulfates can be regarded as zero. By comparing their theoretical removal based on enzyme activity and on-site investigation, it is reasonable to conclude that reverse deconjugation of estrogen conjugates (i.e., conjugation of natural estrogens to form conjugated estrogens) likely exist in WWTP, which explains well why natural estrogen conjugates cannot be effectively removed in WWTP. Meanwhile, this work provides new insights how to improve the removal performance of WWTP on natural estrogen conjugates. Synopsis This work is the first to show how arylsulfatase/β-glucuronidase could affect deconjugation of natural estrogen conjugates and possible way to enhance their removal in wastewater treatment plant.
研究领域:
环境科学
·
水处理
·
生物技术
·
酶学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）