SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Feilong Dong,Qiufeng Lin,Jing Deng,Tuqiao Zhang,Cong Li,Xuedong Zai
The frequent occurrence of algal blooms in surface water has attracted more and more attention, which caused many water quality problems, including disinfection byproducts (DBPs). Algal organic matter (AOM) including intracellular organic matter (IOM) and extracellular organic matter (EOM), was a well-known precursor to DBPs formation in drinking water. This study evaluated the effect of ultraviolet (UV) irradiation on the cell integrity, IOM release and DBPs formation during subsequent chlorination of Chlorella sp. Results showed the damage rates of algal cells increased to 40.1% after the high UV irradiation of 528 mJ/cm 2 , which contributed to the release of IOM. In addition, UV irradiation was effective in reducing the formation of haloacetic acids (HAAs) both in AOM and IOM, but promoted the formation of nitrogenous DBPs (N-DBPs) from AOM in subsequent chlorination. Furthermore, neutral pH exerted a positive effect on the formation of DBPs. UV irradiation decreased the bromine substitution factor (BSF) value of AOM at a high bromide level. The BSF values increased with increasing of the concentration of bromide. Moreover, more amino acids and low molecular weight precursors were produced after UV irradiation in filtered supernatant, which contributed to the formation of N-DBPs with algal chlorination. Overall, this information demonstrated pre-oxidation of UV irradiation could be used to treat the algal-rich drinking water.
研究领域:
环境科学
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水处理工程
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DOI
PubMed
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2021
·Vol. 107
·期 1
·147-153
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IF 2.151
Zhang Rui,Dong Pengyue,Sun Hongwen,Liu Chunguang
To investigate the combined effects of excess boron (B) and high salinity on the growth of freshwater algal species, Chlorella vulgaris and Microcystis aeruginosa were cultured in the medium with different B and salinities. The results show that high levels of B and salinity inhibited the growth of the two algal species. For C. vulgaris , low levels of B can alleviate the growth inhibition induced by salinity, and low levels of salinity can also relieve the growth inhibition induced by B. In contrast, high levels of salinity have little effect on B toxicity, while high levels of B aggravate salinity stress. For M. aeruginosa , salinity aggravates B toxicity, regardless of salinity levels. B supply worsens salinity stress on M. aeruginosa , regardless of supply doses. These results suggest that it may be possible to control algal bloom by regulating B or salinities.
研究领域:
生态学
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环境科学
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DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
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IF 7
Zhiwei Zhou,Chunjiao Liu,Liping Tian,Huiping Wang,Yanling Yang,Xiaobo Wang,Xiaoxiang Cheng
Moderate chemical pre-oxidation of coagulation to remove algae without breakage of the algae cells and release of algal organic matter has been well reported, while little was known about moderate pre-photocatalysis followed by coagulation on the ultrafiltration performance and membrane fouling control during algae-laden water treatment . Herein, three pretreatment methods (photocatalysis, coagulation and moderate pre-photocatalysis-enhanced coagulation (PC)) were investigated to reduce membrane fouling during ultrafiltration of algae-laden water. Moderate photocatalysis by a composite of Bi 2 O 3 -TiO 2 /PAC (Bi-doped TiO 2 nano-composites supported by powdered activated carbon) not only avoided algae cell breakage and controlled the release of intracellular organic matter, but also halved the aluminum sulphate (AS) coagulant dosage, since Bi 2 O 3 -TiO 2 /PAC acted as both a photocatalyst and flocculation core. Under optimal conditions (1.2 g/L Bi 2 O 3 -TiO 2 /PAC irradiated under visible light for 20 min and 0.1 mM AS), the removal of OD 680 , DOC and UV 254 were 83.8 %, 60.3 % and 77.3 % respectively. Moderate photocatalysis degraded medium and high molecular weight organics (biopolymers, humic substances and building blocks) to low MW acidic and neutral organics, resulting in effective removals of humic substances and microbial metabolites typically present in algal-derived pollutant. Following PC pre-treatment with ultrafiltration, 87.5 % increase in the final specific flux, 96.1 % reduction in irreversible resistance, and a change in the fouling mechanism from cake layer blockage to intermediate blockage. In addition, the zeta potential was reduced and the interaction force between pollutant-pollutant/membrane became a repulsive force. This work demonstrates the potential benefits of moderate pre-photocatalysis-enhanced coagulation to remove algal contaminants and mitigate ultrafiltration membrane fouling.
研究领域:
环境科学
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水处理工程
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DOI
高影响因子
Water
·
2021
·Vol. 13
·期 18
·2498
·
IF 3.103
Wenlong Lu,Yifeng Xu,Chuanzhou Liang,Baba Imoro Musah,Lai Peng
The biosorption behaviour of arsenic(V) and cadmium(II) ions by unmodified and five types of chemically modifiedChlorella vulgarisandSpirulina platensiswas investigated. The biosorption rates of As(V) and Cd(II) in binary metal solutions were lower than those in sole metal systems, which exhibited a competition between As(V) and Cd(II) ions to occupy the active sites of the adsorbent. Among the five chemical reagents, NaCl and ZnCl2were the most suitable modifiers for improving the biosorption performance ofC. vulgarisandS. platensis, respectively. The maximum biosorption capacities of As(V) and Cd(II) were: (a) 20.9 and 1.2 mg/g, respectively, forC. vulgarismodified with NaCl; (b) 24.8 and 29.4 mg/g, respectively, forS. platensismodified with ZnCl2, which were much higher than those using other chemically modifying methods. The pseudo-second-order kinetic model fitted well with all the biosorption processes. The SEM analysis revealed that the modification changed the surface morphologies and enhanced the porosity of the algae biomass. The FTIR analysis established the presence of diverse groups of compounds that were largely hydroxyl, carboxylate, amino, and amide groups on the adsorbents that contributed significantly to the upregulated biosorption. This work showed the potential application of chemically modifiedC. vulgarisandS. platensisbiomasses to effectively remove both from water.Keywords:arsenic;cadmium;simultaneous biosorption;algae;chemical modification
研究领域:
环境科学
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生物学
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DOI
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Jiahui Zhang,Mingliang Wu,Miao Yu,Yue He,YuXin Xi,Chenyulin Wang,Yun Pan
Taste and odor (T&O) issues in drinking water sources are common sensory concerns, with thioethers being major contributors to septic odors. Although algal metabolism is a known source of these odors, the mechanisms driving thioether production remain insufficiently explored. This study systematically analyzed the primary thioethers present in a reservoir-based drinking water source in southeastern China. Multiple algal species were cultured under near-natural conditions, both individually and in combination, to investigate the mechanisms of thioether release. The results revealed that dimethyl sulfide (DMS), reaching concentrations up to 2.54 μg/L, was primarily produced by Cyclotella (diatom). Dimethyl trisulfide (DMTS), with a peak concentration of 0.26 μg/L─exceeding its odor threshold by 26-fold─posed the highest odor risk and was mainly produced by Microcystis aeruginosa (cyanobacteria) and Cyclotella. Cyclotella emerged as the primary thioether-producing algae, particularly when coexisting with Microcystis aeruginosa. As the biomass of Microcystis aeruginosa increased, the growth of Cyclotella was inhibited and its proliferative capacity declined, resulting in a 32–54% increase in thioether release, whereas thioether production by Microcystis aeruginosa decreased by 17–76%. This study provides novel insights into algal interactions driving thioether release, guiding odor risk management in water sources.
研究领域:
水生生态学
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环境科学
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饮用水安全
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Dongxu Wang,Juan Chen,Huinan Che,Peifang Wang,Yanhui Ao
Development of immobilized composite photocatalysts for efficient inactivation of algal cells is important because of the features of easy recycling and high stability. Herein, ultrathin g-C 3 N 4 (SCN) are embedded into cellulose acetate (CA) matrix to form CA/SCN composite membranes. The obtained photocatalytic membranes exhibit the properties of thickness uniformity, flexible and higher light absorption compared to the bulk one. Under visible light, 92% of algal can be removed by the optimal CA/SCN photocatalytic membrane (CA/SCN-200). During photocatalytic algal inactivation, algal cells occur photosynthetic activity decrease, antioxidant system collapse and membrane damage. In addition, algal organic matters and MC-LR can also be removed during the photocatalytic process. More importantly, large area membrane which also exhibits high algal removal performance can be prepared easily. This work provides a new way to develop high performance photocatalytic membranes for algal removal.
研究领域:
环境科学
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材料科学
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光催化
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水处理
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DOI
高影响因子
Microorganisms
·
2021
·Vol. 9
·期 11
·2258
·
IF 4.128
Xinya Zhang,Yiruo Xia,Yunlu Jia,Assaf Sukenik,Aaron Kaplan,Chanyuan Song,Guofei Dai,Fang Bai,Lin Li,Lirong Song
Mitigation of harmful cyanobacterial blooms that constitute a serious threat to water quality, particularly in eutrophic water, such as in aquaculture, is essential. Thus, in this study, we tested the efficacy of selected cyanocides towards bloom control in laboratory and outdoor mesocosm experiments. Specifically, we focused on the applicability of a group of cationic disinfectants, alkyltrimethyl ammonium (ATMA) compounds and H2O2. The biocidal effect of four ATMA cations with different alkyl chain lengths was evaluated ex situ usingMicrocystiscolonies collected from a fish pond. The most effective compound, octadecyl trimethyl ammonium (ODTMA), was further evaluated for its selectivity towards 24 cyanobacteria and eukaryotic algae species, including Cyanobacteria, Chlorophyta, Bacillariophyta, Euglenozoa and Cryptophyta. The results indicated selective inhibition of cyanobacteria by ODTMA-Br (C18) on both Chroccocales and Nostocales, but a minor effect on Chlorophytes and Bacillariophytes. The efficacy of ODTMA-Br (C18) (6.4 μM) in mitigating theMicrocystispopulation was compared with that of a single low dose of H2O2treatments (117.6 μM). ODTMA-Br (C18) suppressed the regrowth ofMicrocystisfor a longer duration than did H2O2. The results suggested that ODTMA-Br (C18) may be used as an effective cyanocide and that it is worth further evaluating this group of cationic compounds as a treatment to mitigate cyanobacterial blooms in aquaculture.
研究领域:
环境科学
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水生生物学
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DOI
高影响因子
ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
·
2015
·
IF 2.084
Ting Wang,Xiaoxian Zhang,Dayong Tian,Ya Gao,Zhifen Lin,Ying Liu,Lingyun Kong
CO 2 , as the typical greenhouse gas causing the greenhouse effect, is a major global environmental problem and has attracted increasing attention from governments. Using algae to eliminate CO 2 , which has been proposed as an effective way to reduce the greenhouse effect in the past decades, can be disturbed by a growing number of artificial chemicals. Thus, seven types of chemicals and Selenastrum capricornutum (algae) were examined in this study, and the good consistency between the toxicity of artificial chemicals to algae and the disturbance of carbon fixation by the chemicals was revealed. This consistency showed that the disturbance of an increasing number of artificial chemicals to the carbon fixation of algae might be a “malware” worsening the global greenhouse effect. Therefore, this study proposes an original, promising index to assess the risk of deepening the greenhouse effect by artificial chemicals before they are produced and marketed.
研究领域:
环境科学
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生物学
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DOI
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
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生物能源
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Agha Hasan M.,Abdulhameed Ahmed Saud,Jawad Ali H.,Khadiran Tumirah,ALOthman Zeid A.,Wilson Lee D.
A biopolymer matrix of chitosan (CTS) and algae (AGA) was chemically modified with a natural genipin (GEN) cross-linker agent via hydrothermal process. The resulting green adsorbent (CTS-GEN/AGA) was evaluated for removal of the cationic dye (methyl violet, MV) from aqueous media. The optimization of MV adsorption onto CTS-GEN/AGA was performed using the Box–Behnken design (BBD), considering the variables of adsorbent dose (0.02–0.1 g/100 mL), pH (4–10), and time (20–300 min). The CTS-GEN/AGA demonstrated the highest MV removal (76.49%) for optimal operational parameters: CTS-GEN/AGA dosage (0.0938 g/100 mL), pH (8.4), and contact time (215.3 min). The adsorption isotherm analysis revealed a close fit between the experimental data of MV adsorption and the Temkin model. Furthermore, the adsorption kinetics are well-described by the pseudo-second-order model. The maximum adsorption capacity of CTS-GEN/AGA was 71.9 mg/g at 25 °C. The probable adsorption mechanism can be assigned to H-bonding, electrostatic forces, and n–π stacking interactions. These findings highlight the potential of CTS-GEN/AGA as an effective adsorbent for treatment of wastewater for the removal of organic dyes.
研究领域:
环境科学
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材料科学
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生物化学
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产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 17
·2531
·
IF 3
Zhenjiang Yang,Daoquan Zhao,Jinxing Gu,Ran Wu,Bianzhi Liu,Guangqing Yu,Pengsheng Dong,Xiaocheng Huang,Ming Li,Guoxi Li
To investigate the toxic and environmental effects of prometryn, a laboratory experiment was performed on coexistent fish and algae. The body weight and length ofCarassius carassius,Microcystis aeruginosa(M. aeruginosa) densities and water quality were measured continuously for 92 days. It was observed that fish growth was significantly inhibited by prometryn. This can be partly attributed to the adverse effects of prometryn on the antioxidant system of fish; the activities of superoxide dismutase (SOD) and catalase (CAT) in crucian carp were significantly inhibited by prometryn. The growth ofM. aeruginosawas greatly inhibited by prometryn (p< 0.05), and the adverse effects of prometryn onM. aeruginosaindirectly impacted water qualities. The body weight and length ofCarassius carassiusfirst increased and then tended to be stable with increasing electrical conductivity (EC) values; their quantified relationship was established based on the Gompertz and Logistic equations (R2= 0.920–0.989). Based on the above results, we concluded that the toxic effects of prometryn can impact the antioxidant system of fish and algae which in turn affects their growth performance, and have an indirect impact on water quality. The application of equations made it realizable to obtain a more detailed interpretation of the processes involved in these biological–abiotic interactions.
研究领域:
环境科学
·
毒理学
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产品关联
DOI
高影响因子
CHEMISTRY AND ECOLOGY
·
2022
·
IF 2.381
Yang Cai,Weijie Mu,Kun Jia,Di Huo,Yuhang Wang,Yawen Fan
Harmful effect of nanomaterials on aquatic organisms has accelerated in recent decades due to the growth emission of nanomaterials into water. In the present study, we analysed the toxic effects of TiO2, ZnO and MWCTN on diatoms Nitzschia palea in both individual and a combined way. After a short-term (96 h) exposure, the changes of cell density, chlorophyll a, MDA, SOD, CAT, total protein content and morphological structure were determined. Our results showed that: (1) The growth of N. palea was inhibited with the increase of concentration of nanomaterials; (2) The chlorophyll a content of N. palea was sensitive to these three individual nanomaterials; (3) Low concentration of nanomaterials promoted the MDA content in N. palea, but high concentration inhibited it; (4) The protein content of N. palea increased first and then decreased, indicating that nanomaterial stress inhibited diatom protein synthesis and showed dose-effect relationship; (5) After nanomaterial exposure, the SOD enzyme activity of N. palea was significantly inhibited, the CAT enzyme activity showed significantly decreased after exposure, comparing with control. The results of this study provide data for the study of algae nano-toxicology and provide a theoretical basis for the study of the toxicity of nanomaterials to freshwater microalgae.
研究领域:
环境科学
·
毒理学
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DOI
高影响因子
危险品化学品经营许可证（带存储）