SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Shang Li,Yi Tao,Guo-Hua Dao,Hong-Ying Hu
The risk of harmful algal blooms (HABs) in the water recharged with reclaimed water is a bottleneck for water reuse . The suppression effects and mechanisms of the combination of UV-C and berberine on Microcystis aeruginosa and Scenedesmus obliquus in reclaimed water were investigated. Mono UV-C irradiation at 75 mJ cm −2 could suppress the growth of M. aeruginosa for 7 d and that at 90 mJ cm −2 could suppress the growth of S. obliquus for 5 d. UV-C irradiation combined with 0.2–2 mg L −1 berberine lengthened the inhibition period of M. aeruginosa to 10- > 22 d and that of S. obliquus to 7- > 22 d and induced more rapid lethal effects on the harmful microalgal cells, in significant synergetic patterns. The combination of UV-C and berberine suppressed total, intracellular and extracellular microcystin-LR (MC-LR) more effectively and decreased the MC-LR quota significantly, which further reduced the risks of microcystin production and release. Furthermore, synergetic mechanisms of the combined treatments were systematically investigated from the aspects of photosynthetic system (photosynthetic activity and pigments), metabolic activity (ATP and membrane potential), oxidation stress (reactive oxygen species (ROS) and glutathione (GSH)), and apoptosis-like cell death (phosphatidylserine (PS) ectropion, caspase-3 activity and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) positive rate). The combination treatment provided a joint attack of UV-C and berberine on photosynthetic transport chain of photosynthetic system II (PS II), and a synergetic pathway to achieve more severe disruptions in energy metabolism as well as aggravated oxidative stress . The accumulated ROS enhanced increases in programmed cell death (PCD) indicators of both microalgal species, which contributed to the enhancement effects on growth suppression. The results showed that the combination treatment achieved lower dose requirements of both UV-C irradiation and berberine for inducing the same inhibition effects on microalgal cells, which was promising to be applied in the HABs control of reclaimed water.
研究领域:
环境科学
·
藻类学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Xi Quan,Jun Zhang,Linlin Yin,Wei Zuo,Yu Tian
In this work, a novel composite material based on β-cyclodextrin-immobilized sodium alginate aerogel (β-CD/NaAlg) was developed utilizing cross-linker of epichlorohydrin and applied as an adsorbent to remove tetracycline antibiotics from reclaimed wastewater. A series of characterizations were utilized to confirm the successful synthesis of the adsorbent and this β-CD/NaAlg presented a three-dimensional network at the nano or micro scale. Under optimal conditions (pH=4, t =8 h, β-CD: NaAlg=9, adsorbent dosage=1.5 g·L –1 ), the maximum removal rate of β-CD/NaAlg to tetracycline was 70%. The adsorption behavior of tetracycline on β-CD/NaAlg conformed to the Freundlich isotherm model ( R 2 =0.9977) and the pseudo-second-order kinetic model ( R 2 =0.9993). Moreover, the adsorbent still removed 55.3% of tetracycline after 5 cycles. Specially, the adsorbent was integrated with ultrafiltration to adsorb tetracycline antibiotics from simulated reclaimed wastewater, and the removal rate of tetracycline reached 78.9% within 2 hours. The existence of Cr (VI) had a negligible impact on tetracycline removal, while the presence of humic acid exhibited a promoting effect. The possible adsorption mechanisms were also elucidated through X-ray photoelectron spectroscopy and density functional theory analysis. In summary, β-CD/NaAlg represents an environmentally friendly, efficient, and sustainable adsorbent for removing tetracycline antibiotics from reclaimed water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2019
·Vol. 11
·期 12
·2639
·
IF 2.524
Chi Wang,Zhian Ying,Ming Ma,Mingxin Huo,Wu Yang
The utilization of reclaimed water is a reliable and sustainable approach to enhance water supply in water-deficient cities. However, the presence of micro-organic pollutants (MPs) in reclaimed water has potential adverse effects on aquatic ecosystems and human health. In this study, we investigated the occurrence of 12 target MPs in the influent and reclaimed water collected from a local wastewater treatment plant, and the ultraviolet (UV)–chlorine process was applied to analyze its ability to remove MPs. The results showed that all 12 MPs were detected in both the influent and the reclaimed water, with the concentrations ranging from 25.5 to 238 ng/L and 8.6 to 42.5 ng/L, respectively. Over 52% of all the target MPs were readily degraded by the UV–chlorine process, and the removal efficiency was 7.7% to 64.2% higher than the corresponding removal efficiency by chlorination or UV irradiation only. The degradation efficiency increased with the increasing initial chlorine concentration. The pH value had a slight influence on the MP degradation and exhibited different trends for different MPs. The formation of known disinfectant byproducts (DBPs) during the UV–chlorine process was 33.8% to 68.4% of that in the chlorination process, but the DBPs’ formation potentials were 1.3 to 2.2 times higher. The toxicity assay indicated that UV–chlorine can effectively reduce the toxicity of reclaimed water.Keywords:MPs;UV–chlorine process;disinfectant byproducts;toxicity
研究领域:
环境科学
·
水处理
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2024
·
IF 10.9
Yuguang Mao,Sarra Drissi,Xiang Hu,Jian Zhang,Caijun Shi
This study investigated the effect of wet carbonated recycled cement paste powder (RCPP) on the rheological properties of cement pastes. The results showed that wet carbonated RCPP decreased the cement paste's setting time and flowability , increased its yield stress and plastic viscosity , and changed its thixotropy . The high absorption capacity of the silica gel in the carbonated RCPP was the most dominant factor influencing the rheological properties of the paste. The absorption capacity of silica gel was dependent on its pore structure , specific surface area, and the amount of hydroxyl groups on its surface. These properties varied with the carbonation method, time, temperature, and CO 2 flow rate. The use of monoethanolamine as the aqueous solution for wet carbonation was found to be an effective approach to mitigate the adverse effect of carbonated RCPP on the rheological properties of cement paste .
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Xiao-Tong Lv,Xue Zhang,Ye Du,Qian-Yuan Wu,Yun Lu,Hong-Ying Hu
Chlorinated reclaimed water is widely used for landscaping and recreational purposes, resulting in human exposure to toxic disinfection byproducts . Although the quality of chlorinated reclaimed water might be affected by sunlight during storage, the effects of solar light irradiation on the toxicity remain unknown. This study investigated the changes in cytotoxicity and total organic halogen (TOX) of chlorinated reclaimed water exposed to solar light. Irradiation with solar light for 12 h was found to significantly reduce the cytotoxicity of chlorinated reclaimed water by about 75%, with ultraviolet light being responsible for the majority of this reduction. Chlorine residual in reclaimed water tended to increase the cytotoxicity, and the synergy between solar light and free chlorine could not enhance the reduction of cytotoxicity. Adding hydroxyl radical scavengers revealed that the contribution of hydroxyl radical to cytotoxicity reduction was limited. Solar light irradiation concurrently reduced TOX. The low molecular weight (<1 kDa) fraction was the major contributor of cytotoxicity and TOX in chlorinated reclaimed water. Detoxification of the low molecular weight fraction by light irradiation was mainly a result of TOX dehalogenation, while detoxification of the high molecular weight (>1 kDa) fraction was probably caused by photoconversion from high toxic TOX to low toxic TOX.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Jing Liu,Keyou He,Shengyin Tang,Ting Wang,Zhenghua Zhang
Coagulation-membrane filtration hybrid process has been widely applied in water treatment to improve water quality and alleviate membrane fouling. Herein, we systematically investigated the comparable effect of ferrate, ferrous and ferric pretreatment on fouling alleviation of ceramic membrane in reclaimed water treatment. Our results showed that the pretreatment of ferric, ferrous and ferrate remarkably alleviated membrane fouling with the fouling alleviation performance following the order: ferrate > ferrous > ferric > control. The t crit (subcritical fouling time) after which the fouling rate (dTMP/dt) became much more severe was remarkably extended from 0 (control) to 432 (ferric), 576 (ferrous) and 888 h (ferrate), respectively. Meanwhile, hydraulically reversible fouling resistance had the greatest contribution (58.3%) to the overall fouling resistance in the control case, however, hydraulically irreversible membrane fouling caused by inorganics ( R ir-citrate ) became more severe in long-term operation with the contribution of R ir-citrate to the total fouling resistance of 40.7%, 46.3% and 50.3% in the cases with ferric, ferrous and ferrate pretreatment, respectively. Moreover, the redundancy analysis results showed that the alleviated membrane fouling was principally owing to the sharp reduction of organic matters and the significant increase of particle size and particle concentration in influent. Compared with ferric and ferrous, ferrate had the best fouling alleviation performance, which was mainly due to its dual functions of chemical oxidation (including OH, Fe(V) and Fe(IV)) and coagulation (ferric oxyhydroxides).
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2021
·Vol. 11
·期 8
·2102074
·
IF 9.933
Tian Hu,Chuncheung Chan,Min-Zhao Lin,Huaitian Bu,Bin Liu,Gang-Biao Jiang
Self-regenerative hydrogels have recently been developed, and represent a special type of self-healing hydrogels with the ability to restore a dehydrated hydrogel with physical damage. In this study, a self-regenerative hydrogel (COCu) based on two chitosan polymers assembled by slow-released Cu 2+ is developed. The COCu hydrogel displays an excellent regeneration ability after being dehydrated and fractured. By simple hydration at room temperature, the fragments of the dehydrated gel fuse into one seamless whole, thereby preserving the mechanical properties and functionalities of the original hydrogel. The regeneration process can be conducted repeatedly after different methods of dehydration (natural volatilization, heat drying, lyophilization) and various modes of deconstruction (flakes, powder, lumpy sponge, etc.). Furthermore, the COCu hydrogel provides ultra-stretchability, and it can be stretched into thin (0.01–0.1 mm) filaments, which, when dried (dtCOCu), can be used as suture lines. Moreover, when used as a dry suture, it regenerates into the hydrogel in the presence of the tissue fluid, forming an excellent sealant to immobilize tissues and seamlessly seal wounds. The fast self-regeneration allows for its facile application as both a hydrated gel dressing and dry suture, and offers customized strategies for fixing and repair of different wounds in soft tissues.
研究领域:
材料科学
·
生物医学工程
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 52
·38634-38644
·
IF 3.9
Nazifi Sani Shuaibu,Gaosheng Zhao,Fengjian Chu,Balarabe Bilyaminu Ismail,Aso Ali Abdalmohammed Shateri,Anas Abdullahi Muhammad,Ammar Muhammad Ibrahim,Musbahu Garba Indabawa,Xiaozhi Wang
Water scarcity is a global concern that needs addressing through alternative sources. One of the approaches is the use of reclaimed water for irrigation. However, the presence of halogenated compounds and heavy metals in reclaimed water poses significant food safety threats. Therefore, a comprehensive characterization of these contaminants using a reliable method is essential. This study presents an innovative analytical technique that combines electrospray ionization (ESI) with microwave plasma ionization mass spectrometry (MPIMS), enabling the simultaneous detection of organic compounds and heavy metals. The plasma ionization process in metals exhibits novel features, unlike traditional methods, making it suitable for organic and metallic detection in complex matrices. This technique achieved a recovery rate of 78.5–123% and 79.93–119.50% for halogenated compounds and heavy metals, respectively. The limits of detection and quantification ranged from 1.5 ng mL−1 to 3.5 ng mL−1 and 4.5 ng mL−1 to 12.75 ng mL−1, respectively. Analysis of reclaimed water from three irrigation systems revealed concentrations of halogenated compounds and heavy metals below allowable levels set by national agencies, indicating manageable pollution risks. H-compounds, such as diuron and linuron, were prevalent in all samples, while zinc and lead showed higher levels in flood and sub-irrigation systems. Compared to traditional methods, ESI-MPIMS performs well and demonstrates high efficiency, good quantification, and high sensitivity in the analysis of real samples. This study shows that ESI-MPIMS is promising for on-site analysis of organic compounds and heavy metals in complex matrices and is suitable for water quality control and environmental quality assessment for pollutant screening.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Jun Zhang,Xi Quan,Fu Li,Chenxi Zhen,Linlin Yin,Wei Zuo,Yu Tian
Ferrate is increasingly used as an oxidant for chemical oxidation of pharmaceuticals and personal care products (PPCPs) in reclaimed water. However, the instability of ferrate in aqueous solution and its low content of active ingredients have limited its application in water purification . In this paper, a novel β-cyclodextrin encapsulated potassium ferrate composite (KFO@β-CD) is synthesized for the first time using a thermomelting-condensation method and used to degrade carbamazepine (CBZ). This study evaluates and demonstrates the superior stability, sustained release behavior and hygroscopic characteristics of KFO@β-CD. In-depth investigations show that KFO@β-CD with a mass ratio of 10:1 can degrade 85.2 % of CBZ in 60 min. Analyzing the transformation pathways of CBZ has shown that Fe(VI) performed more reactive with olefinic double bond owing to electron-rich organic moieties, which convert carbamazepine to oxidized products with low molecular weight . These results significantly improve the state of our knowledge about this highly efficient and stable oxidant, which is likely to be useful for further degradation of PPCPs.
研究领域:
环境科学
·
化学工程
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Bei Ye,Qian-Yuan Wu,Wen-Long Wang,Hong-Ying Hu
Pharmaceutical and personal care products (PPCPs) are frequently detected in water bodies and have potential risks to human health and the ecosystem. The degradation of eight structurally diverse PPCPs by ammonia/chlorine was systematically investigated in this study. Compared with chlorination, ammonia/chlorine markedly enhanced PPCP degradation, and the degradation efficiencies of most PPCPs were greater than 70%. Tert-butanol strongly suppressed PPCP degradation, while bicarbonate suppressed it moderately, suggesting the importance of ClO⋅and ⋅CO 3 − in PPCP degradation. In neutral conditions, PPCP degradation was mainly attributed to ⋅OH, with its contribution ranging from 74% to 100% at a Cl 2 /N molar ratio of 1.6. Regarding the effect of natural organic matter, atrazine and primidone were inhibited the most, while carbamazepine (CBZ), metoprolol (MTP), and atenolol (ATN) were affected the least. PPCP degradation was suppressed in reclaimed water; the degradation of CBZ, MTP, and ATN was suppressed the least, with degradation efficiencies of 77.1%–85.4%, 75.1%–77.1%, and 64.6%–68.8%, respectively. Furthermore, compared with chlorination, fewer volatile halogenated byproducts were formed in reclaimed water when using the ammonia/chlorine process, and the concentration of each byproduct formed by ammonia/chlorine was less than 10 µg/L. This study suggests the feasibility of using ammonia/chlorine oxidation to degrade PPCPs in reclaimed water.
研究领域:
环境科学
·
水处理
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yu Ma,Dongyu You,Yu Fang,Jian Luo,Qinhe Pan,Yunling Liu,Fei Wang,Weiting Yang
The removal of lead ions from water is a global concern due to the great damage to human health when they enter the human body through drinking water. Herein, metal-organic framework/chitosan composite beads for the adsorption of Pb(II) were prepared by the secondary growth method, which allowed the domain-limited growth of TIF-A1 (a tetrahedral imidazolate framework) in the porous matrix of chitosan. This material can remove trace Pb(II) from aqueous solution (100 ppb) with an efficiency of 99.95%, and the remaining Pb(II) content meets the international drinking water standards. Moreover, it exhibited good recoverability for at least five adsorption/desorption cycles. The adsorption mechanism can be ascribed to that Pb(II) ions chelate with the hydroxyl, carboxyl and amino groups in the adsorbent. This work offers a good adsorbent for the removal of trace Pb(II), which has potential applications in reclaimed water treatment.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Muhan Sun,Xiaoxu Jiang,Rui Liu,Deqin Kong,Hao Wu,Zhao Wang,Gang Zheng,Chongmiao Zhang,Weihua Yu
Sewage effluent and reclaimed water usually contain elevated concentrations of bacteria-derived endotoxins, which may have serious public health implications upon exposure. Both conventional disinfection methods, such as chlorine, ultraviolet, and ozone disinfection, and the new potassium ferrate disinfection process have limited endotoxin removal capacity. Therefore, it is necessary to find new methods of removing endotoxins. In this study, we investigated the effects of ultraviolet/ferrate (UV/Fe(VI)) combination treatment on endotoxin elimination and inhalation hazard control. Our results indicate that UV or Fe(VI) alone cannot sufficiently eliminate endotoxins but can instead exacerbate endotoxin release during bacterial inactivation. However, the UV/Fe(VI) combination rapidly eliminated approximately 85.6 % of both pure and bacteria-derived endotoxins. The optimal conditions for this disinfection process were determined to be 10 mg/L of Fe(VI) and 160 μW/cm 2 of UV exposure for 15 min. Furthermore, the pH value, bicarbonate (HCO 3 – ), humic acid, and turbidity were determined as potential factors that may affect UV/Fe(VI)-mediated endotoxin removal in reclaimed water. The potential mechanism underlying UV/Fe(VI)-induced endotoxin degradation involves several strongly oxidizing species, among which Fe(IV)/Fe(V) is regarded as the primary contributor, followed by the superoxide anion ( • O 2 – ) and hydroxyl ( • OH) radicals. These active substances induce the breakdown of the endotoxin molecular structure into smaller, non-toxic fragments. Furthermore, pure endotoxins, Escherichia coli , and Pseudomonas aeruginosa were disinfected with UV/Fe(VI), and then these aerosolized samples were inhaled exposed to mice. Our results demonstrated that combined use of UV and Fe(VI), rather than administration alone, remarkably blunted bacterial- and endotoxin-induced lung injury. In conclusion, these results demonstrate that the UV/Fe(VI) approach successfully eliminates endotoxins and related inhalation hazards from reclaimed water.
研究领域:
环境科学
·
公共卫生
·
微生物学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）