Desalination and Water Treatment
·
2024
·
IF 1
Ying Zhang,Xule Chen,Miao Dong,Meiyan Li,Chengwen Wang,Yanzong Zhang
During the process of oilfield wastewater reuse, residual Boron in fracturing flowback fluid will lead to premature crosslinking with gelling agents, resulting in excessive viscosity at the front end of the fracturing fluid configuration. This phenomenon has heavily influenced the reuse of wastewater. Electrocoagulation (EC), as an effective approach to decreasing Boron concentration, has been widely studied, while further research of Boron removal from complicated wastewater is required to optimize. EC parameters were investigated to explore the optimal Boron removal effect of Fe, Al and Fe-Al three combined anodes. Under 46.3–57.2 mA/cm 2 , 90 min and pH of 9, Fe-Al anodes exhibit the best effect of Boron removal (84% ± 1.5%). Furthermore, high adaptive capacity of low current density and suitable pH confirm the best choice of Fe-Al combined anodes. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) demonstrate the complexation between Boron and metallic oxide. Finally, the common removal of various pollutants including Ca, Cl, K and Na further conduces to the reuse of oil wastewater.
研究领域:
环境科学
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废水处理
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Bai Yujie,Huang Bin,Zou Che,Xu Xuenan,Liu Weibo,Wang Zhe,Zhang Ning,Li Dan,Cao Guangsheng,Fu Cheng
The silicates in flowback fluids from acidizing oil wells can be used as raw materials for the synthesis of nanomaterials , that are beneficial for the treatment of produced water and enhanced oil recovery . In this paper, the nanomaterials were synthesized from acidizing flowback fluids by sol-gel method and the reaction conditions were optimized. The interfacial tension, wetting angle and surface tension of the solution were measured. The test of displacement efficiency and flooding experiments were conducted in two dimensional flat cores to reveal the mechanism of enhanced oil recovery by nanoparticles . The results indicated that the nanoparticles with a diameter of 351 nm could be extracted and synthesized from acidizing flowback solution at low pH. Compared with other nanomaterials, the synthesized nanoparticles could change the interfacial properties between oil and water due to the complex acidizing process. When the injection concentration of nanoparticles reached 300 mg/L, the decrease of water cut reached the maximum, up to 27.16%, and the recovery rate during subsequent water flooding was 32.25%. Appropriately increasing the injection concentration of nanoparticles extracted from acidizing flowback fluids was beneficial to improve the recovery rate, so that realizing the efficient development of oil and gas resources. The research results can provide a new method for the treatment of oilfield wastewater.
研究领域:
石油工程
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材料科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
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IF 7
Dandan Liu,Xing Liang,Mian Wu,Xiaobing Li
Shale gas fracturing flowback fluid (FFF) is characterized as the hazardous wastewater with high viscosity, large displacement, and complex components, which is difficult to deal with. Flocculation has been proven to be the most extensively applied treatment process considering its effortless operation, low energy consumption, and comparatively high efficiency. However, efficient removal of ultrafine colloidal particles (<10 μm) from FFF still remains a big challenge since their extremely stable properties. Herein, microbubbles (MBs) were introduced into the flocculation reaction to enhance the flocculation performance. When the median particle diameter (d 50 ) of MBs reached 0.97 μm (which matched the size of selected colloidal particles), the turbidity removal rate was as high as 91.93 % at 0.70 g/L flocculant dosage, which was superior to traditional stir flocculation without MBs (66.67 %). Under this condition, the mean floc size reached the maximum value of 64.77 μm at 30 s after adding the flocculant. Meanwhile, the floc fractal dimension was significantly improved and the flocs held more resilient, which was beneficial for solid-liquid separation. The MBs worked by the trapping and bridging functions. Consequently, microbubble-intensified flocculation provided an advantageous way for the effective removal of ultrafine colloidal particles in FFF by controlling the bubble size appropriately.
研究领域:
环境工程
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水处理技术
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产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 7
·1568
·
IF 4.6
Huohai Yang,Yeqi Gong,Xin Chen,Renze Li,Yuhang Chen,Mingjun Li,Xinrui Tang
The ecological impact linked to hydraulic fracturing, namely with the usage of water and the energy-intensive disposal of flowback fluids, has led to a thorough evaluation of alternative treatment approaches that are more environmentally friendly. The objective of this work was to create coralline-like anatase TiO2/α-Ni(OH)2particles using a hydrothermal approach. The purpose was to improve the efficiency of photocatalysis by increasing the number of oxygen vacancies. An ozone-assisted photocatalytic reaction was used to increase the composite photocatalyst’s degrading efficiency for fracturing flowback fluid. The fracturing flowback fluid’s chemical oxygen demand (COD) degradation efficiency was greatly increased following the introduction of the synergistic treatment system consisting of sedimentation, membrane separation, and ozone photocatalysis. This improvement led to a reduction of 98.42% during a processing time of 90 min, using a Ti/Ni mass ratio of 1:1. This collaborative method partially replaced traditional methods of evaporation concentration and electrochemical degradation, resulting in a 24.18% enhancement compared to individual material catalyst systems. These findings provide crucial insights for improving and optimizing external treatment techniques in shale gas fracturing operations.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 44
·38437-38446
·
IF 3.289
Kai Wang,Chen Liu,Wensheng Zhou
The utilization of a viscoelastic-based surfactant recovered from fracturing flowback fluid in chemical flooding was investigated in this paper. The interfacial tension behavior, wettability alteration, dynamic adsorption capacity and incremental oil recovery ability were studied. The oil/water interfacial tension was lowered to 10−4 to 10−3 mN m−1 due to 0.06 to 0.15 wt% of VES in the fracturing flowback fluid. The oil-wet surface can be easily converted to weak water-wet through adsorption of VES. A series of sandpack core flooding tests were conducted under the Dingbianluo reservoir condition to investigate the effects of interfacial tension and slug sizes on enhanced oil recovery. Finally, an SEM scanning test and microscopic displacement test were used to investigate the mechanism of surfactant flooding. This investigation confirmed that the fracturing flowback fluid recovered from fracturing treatment can be reused for surfactant flooding with probable environmental and economic benefits.
研究领域:
石油工程
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.5
Xiong Ying,Zhou Houan,Zhou Lang,Pu Junhong
In this paper, a dithiocarbamate-type flocculant DTC-TETA was prepared by using triethylenetetramine as the material and combination of DTC-TETA and polyacrylamide was used for the coagulation-flocculation of flowback water from shale gas hydraulic fracturing (FWSG). The coagulation-flocculation process was optimized by using turbidity as index and the recommended process was as follows: DTC-TETA dosage 200 mg/L, anionic polyacrylamide AN905 dosage 1 mg/L, flocculation stirring speed 200 rpm, flocculation stirring time 3 min and settlement time 5 min. The turbidity of FWSG can be reduced to be 13 NTU from the initial turbidity of more than 2000 NTU under the recommended process. The performance of DTC-TETA was much better than that of polyaluminum chloride and the Fe2+ in FWSG also can be removed. The function mechanism of DTC-TETA was investigated through the studies of zeta potential change of suspended solids and structural characteristics of flocs. The results confirmed that the flocs were developed by the network formed by the coordination reaction between DTC-TETA and Fe2+, which can filter out suspended solids. This study signifies that both suspended solids and Fe2+ ion can be removed by using DTC-TETA as flocculant, which is a new choice for the FWSG treatment.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
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2024
·
IF 2.2
Tianju Zhu,Jiao Song,Xiaoling Zhou,Yuqin Liu
Composite flocculant PAFS-PDM was prepared from Polymeric aluminium ferric sulphate (PAFS) and Poly (diallyl dimethyl ammonium chloride) (PDM) in this study. A bacterium was selected from the soil near the shale gas exploitation platform as a bioflocculant-producing bacterium, and polysaccharide was extracted and combined with PAFS-PDM to obtain composite bioflocculant (CBF) to treat shale gas fracturing flowback fluid. The prepared CBF was characterized and the results showed that the prepared PAFS-PDM contained aluminium-iron hydroxyl polymer, which was a cationic flocculant. By measuring the turbidity removal rate and chemical oxygen demand (COD) removal efficiency, the function mechanism of CBF on the shale gas fracturing flowback fluid was discussed. The results showed that CBF had a stable treatment effect on fracturing flowback fluid when the pH value was about 7.0. With the increase of dosage, the coagulation efficiency increased first and then decreased. When the dosage of the CBF was 2500 mg·L−1, the treatment effect of shale gas fracturing flowback fluid was the best, and COD removal rate reached 89.43%. Through Zeta potential analysis, it was concluded that one of the coagulation mechanisms was electrical neutralization. According to the characterization results, it could be concluded that both adsorption bridging and charge neutralization mechanisms played important roles in the treatment of shale gas fracturing flowback fluids.
研究领域:
环境科学
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微生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2021
·
IF 5.485
Bing Wang,Mingyang Xiong,Bin Shi,Zhuoying Li,Huan Zhang
A carbon-nanotube-nested diatomite adsorbent (CND-composite adsorbent) was successfully prepared and introduced to remove organic contaminants from shale gas flowback water. The CND-composite adsorbent was then characterized using Scanning Electron Microscopy, Brunauer Emmett Teller, Mercury Intrusion Porosimetry and X-ray Diffraction (XRD) analyses. The changes in the organic species present in the shale gas flowback water before and after adsorption were characterized via Gas Chromatography-Mass Spectrometer. The kinetics, isotherms and thermodynamics of the adsorption of organic matter in shale gas flowback water on the CND-composite adsorbent were investigated on the basis of static experiments. The CND-composite adsorbent had hierarchical mesoporous/ macroporous structures. The adsorption experiments indicated that the maximum removal efficiency for total organic carbon was 78.91 %. The adsorption mechanisms mainly involved intermolecular interactions, electrostatic interaction and hydrogen bonds. Results showed that the Freundlich isothermal model and pseudo-second-order model were suitable for the characterization of the adsorption process in this work. The changing values of thermodynamic parameters, including the Gibbs free energy, entropy, and enthalpy, indicated that the adsorption process was spontaneous and endothermic. In addition, the adsorption process was jointly controlled by physical and chemical mechanism. In summary, the CND-composite adsorbent has potential for utilization in the removal of organic pollutants in real wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Shangbo Zhou,Shuchan Peng,Zhiqiang Li,Daijun Zhang,Yantao Zhu,Xingquan Li,Mingyu Hong,Weichang Li,Peili Lu
As hydraulic fracturing (HF) practices keep expanding in China, a comparative understanding of biological characteristics of flowback and produced waters (FPW) and sludge in impoundments for FPW reserve will help propose appropriate treatment strategies. Therefore, in this study, the microbial communities and functions in impoundments that collected wastewaters from dozens of wells were characterized. The results showed that microbial richness and diversity were significantly increased in sludge compared with those in FPW. The vast majority of microorganisms found in FPW and sludge are organic degraders, providing the possibility of using these indigenous microorganisms to biodegrade organic compounds. Our laboratory findings first show that wastewater pretreatment using these microorganisms was effective, and organic compounds in FPW from different shale formations were removed by 35–68% within 72 h in a wide temperature range (8 – 30 ℃). Meanwhile, highly toxic compounds such as phthalate esters (PAEs), polycyclic aromatic hydrocarbons (PAHs), and petroleum hydrocarbons were effectively eliminated in reactors. The main microorganisms, key functional genes, and putative pathways for alkanes, PAHs, and PAEs degradation were also identified.
研究领域:
环境微生物学
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生物修复
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废水处理
·
水力压裂
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DOI
PubMed
高影响因子
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·
IF 3.4
Muhammad Faisal Altaf,Bo Peng,Hafiz M. Irfan,Zhuang Miao,Ousseini Seidina Ousseini,Jixiang He,Ali Keçebaş,Yashar Aryanfar
The efficient separation of oil from complex industrial wastewaters, particularly hydraulic fracturing flowback, remains a critical environmental challenge. This study presents an innovative approach to utilizing cationic polyacrylamide (CPAM) synergistically modified with hydrophobic nano silica (SiO 2 ) and 3-(methacryloyloxy)propyltrimethoxy silane (KH570) to enhance oil/water separation efficiency. Comparative evaluation of unmodified CPAM against CPAM-SiO 2 -KH570 composites at varying SiO 2 loadings (10%, 13%, and 16%) revealed significant performance improvements. Unmodified CPAM achieved a peak transmittance of 89% at pH 7 (0.4 g/L), with reduced clarity in acidic and alkaline conditions. In contrast, the nano-modified composites demonstrated superior and more robust flocculation. The 10% SiO 2 composite exhibited excellent clarity (90-94% at pH 7) and the broadest dose tolerance (0.3-0.4 g/L), offering high operational flexibility. The 13% SiO composite achieved the highest and most robust clarity (95-98% at pH 7) over a broad dosage window (0.25-0.4 g/L), maintaining strong performance across varying pH, making it ideal for high-specification polishing. While the 16% SiO 2 composite delivered clarification (∼99%) at lower dosages (0.1-0.2 g/L), it exhibited a narrow optimal window and high pH sensitivity. These enhancements result from the hybrid flocculant’s increased hydrodynamic diameter 16-25 μm vs. ∼7 μm for CPAM and sustained positive charge. Additionally, stronger electrostatic and hydrophobic anchoring via the KH570 alkyl shell, combined with enhanced bridging capability due to rigid silica nodes, leads to more stable flocs. This research demonstrates that hydrophobic nano-modified CPAM offers a highly efficient, fast-kinetics, and structurally robust solution for oilfield wastewater treatment, enabling high separation efficiency with reduced chemical consumption and promoting sustainable water management practices.
研究领域:
环境工程
·
化学工程
·
纳米技术
·
高分子科学
·
水处理
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产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
Fuhua Wang,Zezhuang Sun,Xian Shi,Luyi Wang,Weidong Zhang,Zhihao Zhang
An effective hybrid system was applied as the first report for the successful treatment of key pollutants (hydroxypropyl guar gum, HPG) in fracturing flowback fluid, and the synergistic index of the hybrid system was 20.45. In this regard, chemical oxygen demand ( COD ) removal ratio was evaluated with various influencing operating factors including reaction time, H 2 O 2 concentration, Fe 2+ concentration, ultrasonic power, initial pH, and temperature. The optimal operating parameters by single-factor analysis method were: the pH of 3.0, the H 2 O 2 concentration of 80 mM, the Fe 2+ concentration of 5 mM, the ultrasonic power of 180 W, the ultrasonic frequency of 20–25 kHz, the temperature of 39 ℃, the reaction time of 30 min, and the COD removal rate reached 81.15 %, which was permissible to discharge surface water sources based on the environmental standards. A possible mechanism for HPG degradation and the generation of reactive species was proposed. Results of quenching tests showed that various impacts of the decomposition rate by addition of scavengers had followed the order of EDTA-2Na < BQ < t -BuOH, therefore OH radicals had a dominant role in destructing the HPG. Based on the kinetic study, it was concluded that Chan Kinetic Model was more appropriate to describe the degradation of HPG. Identification of intermediates by GC–MS showed that a wide range of recalcitrant compounds was removed and/or degraded into small molecular compounds effectively after treatment. Under the optimal conditions, the sono-Fenton system was used to treat the fracturing flowback fluid with the initial COD value of 675.21 mg/L, and the COD value decreased to 80.83 mg/L after 60 min treatment, which was in line with the marine sewage discharge standard. In conclusion, sono-Fenton system can be introduced as a successful advanced treatment process for the efficient remediation of fracture flowback fluid.
研究领域:
环境工程
·
水处理
·
高级氧化过程
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产品关联
DOI
PubMed
高影响因子
Environmental Technology & Innovation
·
2023
·
IF 7.1
Hanghai Zhou,Xiaomin Huang,Lijia Jiang,Qi Shen,Hong Sun,Ming Yi,Xin Wang,Xiaohong Yao,Yifei Wu,Chunfang Zhang,Jiangwu Tang
Large quantities of hydraulic fracturing flowback and produced water (HF-FPW) represent an important environmental issue owing to their inclusion of toxic petroleum contaminants. Enzymatic degradation is a promising approach for treating these pollutants. However, the low stability and poor reusability of free enzymes greatly inhibit their applications. This study investigated the effect of biochar-immobilized laccases on the biodegradation of petroleum contaminants in HF-FPW. Acid functionalization of corn straw biochar increased its surface area and pore volume, allowing it to adsorb additional laccase on the surface. Biochar-immobilized laccase exhibited a high tolerance to a low pH and high temperatures and retained >81.0% of its relative activity at 4 °C for 20 d. In addition, the immobilized laccase displayed reusability after six reaction cycles, retaining 40.9% of its activity. Supplementation with immobilized laccase substantially improved microbial growth and fluorescein diacetate hydrolase activity in HF-FPW, which were up to 25.5 times and 4.9 times higher than those of the free laccase treatment, respectively. The immobilized laccase also elevated the transcription levels of degradation genes such as rub and xylE , and greatly enhanced the biodegradation of n -alkanes (reduction from 112.4 mg/L to 41.9 mg/L) and polycyclic aromatic hydrocarbons (reduction from 2606 . 2 μ g /L to 1526 . 6 μ g /L). Full-length 16S rRNA gene sequencing revealed that Pseudomonas stutzeri , Pseudomonas balearica , and Stenotrophomonas maltophilia dominated the microbial community and were potential functional populations. This study represents the first attempt of utilizing biochar-immobilized laccase to treat HF-FPW and has important implications for efforts to develop strategies for HF-FPW remediation.
研究领域:
环境科学
·
生物技术
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微生物学
·
废物管理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）