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Research progress in removal of trace carbon dioxide from closed spaces

ZHANG Yatao, FAN Lihai, ZHANG Lin, CHEN Huanlin

《化学科学与工程前沿(英文)》 2007年 第1卷 第3期   页码 310-316 doi: 10.1007/s11705-007-0057-x

摘要: In this paper, the removal of trace carbon dioxide from closed spaces through membrane process and biotransformation are introduced in detail. These methods include the microalgae photobioreactor, membrane microalgae photobioreactor, supported liquid membrane, membrane gas-liquid contactor, hydrogel membrane, and enzyme membrane bioreactor. The advantages and disadvantages of these methods are compared. It is found that higher CO removal efficiency can be obtained in biotransformation and membrane process. However, a large volume and high energy consumption are needed in biotransformation, while the low permeability and stability must be solved in the membrane process.

关键词: removal efficiency     consumption     removal     CO removal     membrane microalgae    

Removal of SO

Xiaolei LI, Chunying ZHU, Youguang MA

《化学科学与工程前沿(英文)》 2013年 第7卷 第2期   页码 185-191 doi: 10.1007/s11705-013-1326-5

摘要: In this work, the removal of SO from gas mixture with air and SO by ammonium bicarbonate aqueous solution as absorbent was investigated experimentally in a bubble column reactor. The effects of the concentration of ammonium bicarbonate, the SO inlet concentration of gas phase and the gas flow rate on the removal rate of SO were studied. The results showed that the higher the SO inlet concentration and the gas flow rate, the shorter the lasting time of SO completely removed in gas outlet, and then the faster the decrease in the removal rate of SO . The lasting time of SO completely removed in gas outlet increased with increasing ammonium bicarbonate concentration. During the process of SO absorption, there was a critical pH of solution. When the solution pH was less than the critical pH, it would sharply fall, resulting in a rapid decrease of the SO removal rate. A theoretical model for predicting the SO removal rate has been developed by taking the chemical enhancement and the sulfite concentration in the liquid phase into account simultaneously.

关键词: SO2 removal     bubble column reactor     removal rate     ammonium bicarbonate     absorbent    

Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture

《环境科学与工程前沿(英文)》 2021年 第15卷 第4期 doi: 10.1007/s11783-020-1358-2

摘要:

• Microbes enhance denitrification under varying DO concentrations and SIF dosages.

关键词: Scrap iron filing     Nitrate removal     Phosphate removal     Mixed culture denitrification     Zero valent iron    

Mercury removal from flue gas using nitrate as an electron acceptor in a membrane biofilm reactor

《环境科学与工程前沿(英文)》 2022年 第16卷 第2期 doi: 10.1007/s11783-021-1454-y

摘要:

Membrane bioreactor achieved mercury removal using nitrate as an electron acceptor.

关键词: Mercury removal     Oxygen     Ferrous sulfide     Transformation of mercury     Microbial community    

Analysis of Flue Gas Pollutants Deep-removal Technology in Coal-fired Power Plants

Xiao-lu Zhang

《工程管理前沿(英文)》 2014年 第1卷 第4期   页码 336-340 doi: 10.15302/J-FEM-2014061

摘要: In recent years, frequent haze has made PM become a public hotspot. PM control has been added to the 2012 release “ambient air quality standard.” Currently flue gas pollutant control technology does not easily remove PM . Developing Flue Gas Pollutant Deep-removal Technology (DRT) for coal-fired power plants for deep-removing pollutants such as PM , SO , SO , and heavy metals, is an urgent problem. Based on the analysis of the necessity and existing problems of developing DRT suitable for China, this study focused on PM removal technology, low NO emission of ultra supercritical boiler under all load conditions, and the adaptability of SCR working temperature. Finally, the flue gas pollutant removal system at a 2×660MW supercritical power plant was introduced, and the roadmap for developing DRT for 1,000MW ultra supercritical units was analyzed.

关键词: Coal-fired power plant     flue gas pollutants     deep-removal     PM2.5 removal    

of magnetic multi-template molecularly imprinted polymer composite for the selective and efficient removal

《环境科学与工程前沿(英文)》 2021年 第15卷 第5期 doi: 10.1007/s11783-021-1395-5

摘要:

• Magnetic multi-template molecularly imprinted polymer composite was synthesized.

关键词: Tetracyclines     Removal     Adsorption     Molecularly imprinted polymer     Magnetic graphene oxide    

Preparation and selection of Fe-Cu sorbent for COS removal in syngas

Bowu CHENG, Zhaofei CAO, Yong BAI, Dexiang ZHANG

《化学科学与工程前沿(英文)》 2010年 第4卷 第4期   页码 441-444 doi: 10.1007/s11705-010-0507-8

摘要: A series of iron-based sorbents prepared with iron trioxide hydrate, cupric oxide by a novel method was studied in a fixed-bed reactor for COS removal from syngas at moderate temperature. In addition, the sorbents mixed with various additives in different ratios were tested. The effects of additive type and ratio on the breakthrough capacity and desulfurization performance, as well as the influence of operating conditions on sulfidation behavior of the sorbent, were investigated. The simulate gas contained 1% COS, 5% CO , 20%–30% CO and 60%–70% H . The outlet gases from the fixed-bed reactor were automatically analyzed by on-line mass spectrometry, and the COS concentration before breakthrough can be kept steady at 1 ppmv. The result shows that the breakthrough sulfur capacity of the sorbent is as high as 25 g-S/100 g. At 700 K and space velocity of 1000 h , the efficiency of sulfur removal and breakthrough sulfur capacity of the sorbent increase with the increase of copper oxide with an optimum value. The result shows that the species and content of additives also affect desulfurization performance of the sorbent.

关键词: sorbent     desulfurization     COS removal     syngas    

Phosphorous removal from wastewater by lanthanum modified Y zeolites

Weikang ZHANG, Ye TIAN

《化学科学与工程前沿(英文)》 2015年 第9卷 第2期   页码 209-215 doi: 10.1007/s11705-014-1448-4

摘要: The adsorption capacities of Y zeolite and La (III)-modified Y zeolite were studied. A series of La(III)-modified Y zeolites with different La/Y zeolite mass ratios were characterized by X-ray diffraction, X-ray fluorescence and Brunauer-Emmett-Teller surface area analysis. Batch experiments were conducted to evaluate the effects of various experimental parameters, such as pH, ionic strength, coexisting anions ( , Cl , and ) and temperature, on the phosphate adsorption. The capacity of the La (III)-modified Y zeolite to remove phosphate increased as the La/Y zeolite mass ratio increased and after 4 h, a phosphate removal efficiency of 95% was achieved for a La/Y zeolite mass ratio of 0.10. The equilibrium adsorption isotherm data correlated better to the Langmuir model than the Freundlich model and the data followed a pseudo-second-order kinetic equation.

关键词: phosphate removal     wastewater     lanthanum     impregnation     Y zeolites    

Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using

《环境科学与工程前沿(英文)》 2023年 第18卷 第4期 doi: 10.1007/s11783-024-1807-4

摘要:

● MnO2/PCL composite material (MPCM) enhances ammonia and nitrate removal in CWs.

关键词: Constructed wetland     Nitrogen removal     Manganese redox     Polycaprolactone     Nitrous oxide    

Hongshiyan Landslide Dam Danger Removal and Coordinated Management

Ning Liu

《工程管理前沿(英文)》 2014年 第1卷 第3期   页码 308-317 doi: 10.15302/J-FEM-2014041

摘要: This paper takes an overview of the Hongshiyan landslide dam triggered by an earthquake near Ludian County in Zhaotong City, Yunnan Province, introduces how the danger removal plan is drafted and implemented, and analyzes the outcome of its implementation. The paper then explains the significance and effect of coordinated management in the event of natural disasters and other public safety emergencies, and discusses ways to improve coordinated management.

关键词: the Zhaotong Ludian earthquake     danger removal of the landslide dam     coordinated management    

Enhanced nutrients removal from municipal wastewater through biological phosphorus removal followed by

Yandong Yang,Liang Zhang,Hedong Shao,Shujun Zhang,Pengchao Gu,Yongzhen Peng

《环境科学与工程前沿(英文)》 2017年 第11卷 第2期 doi: 10.1007/s11783-017-0911-0

摘要: EBPR and PN/A were combined to enhance nutrients removal from municipal wastewater. High effluent quality of 0.25 mg TP?L and 10.8 mg TN?L was obtained. Phosphorus and nitrogen removal was achieved in two separated units. A proper post-anoxic phase improved the nitrogen removal performance of PN/A unit. Conventional biological removal of nitrogen and phosphorus is usually limited due to the lack of biodegradable carbon source, therefore, new methods are needed. In this study, a new alternative consisting of enhanced biological phosphorus removal (EBPR) followed by partial nitritation-anammox (PN/A), is proposed to enhance nutrients removal from municipal wastewater. Research was carried out in a laboratory-scale system of combined two sequencing batch reactors (SBRs). In SBR1, phosphorus removal was achieved under an alternating anaerobic-aerobic condition and ammonium concentration stayed the same since nitrifiers were washed out from the reactor under short sludge retention time of 2–3 d. The remaining ammonium was further treated in SBR2 where PN/A was established by inoculation. A maximum of nitrogen removal rate of 0.12 kg N?m ?d was finally achieved. During the stable period, effluent concentrations of total phosphorus and total nitrogen were 0.25 and 10.8 mg?L , respectively. This study suggests EBPR-PN/A process is feasible to enhance nutrients removal from municipal wastewater of low influent carbon source.

关键词: Phosphorus removal     Partial nitrification     Anammox     Municipal wastewater    

VALORIZATION OF BIOGAS THROUGH SIMULTANEOUS CO AND HS REMOVAL BY RENEWABLE AQUEOUS AMMONIA SOLUTION IN

《农业科学与工程前沿(英文)》 2023年 第10卷 第3期   页码 468-478 doi: 10.15302/J-FASE-2022473

摘要:

● Simultaneous H2S and CO2 removal from biogas is studied.

关键词: biomethane     biogas purification     CO2 removal     H2S removal     membrane absorption    

Immobilization of laccase on organic–inorganic nanocomposites and its application in the removal of phenolic

《化学科学与工程前沿(英文)》 2023年 第17卷 第7期   页码 867-879 doi: 10.1007/s11705-022-2277-5

摘要: Polydopamine-functionalized nanosilica was synthesized using an inexpensive and easily obtainable raw material, mild reaction conditions, and simple operation. Subsequently, a flexible spacer arm was introduced by using dialdehyde starch as a cross-linking agent to bind with laccase. A high loading amount (77.8 mg∙g‒1) and activity retention (75.5%) could be achieved under the optimum immobilization conditions. Thermodynamic parameters showed that the immobilized laccase had a lower thermal deactivation rate constant and longer half-life. The enhancement of thermodynamic parameters indicated that the immobilized laccase had better thermal stability than free laccase. The residual activity of immobilized laccase remained at about 50.0% after 30 days, which was 4.0 times that of free laccase. Immobilized laccase demonstrated excellent removal of phenolic pollutants (2,4-dichlorophenol, bisphenol A, phenol, and 4-chlorophenol) and perfect reusability with 70% removal efficiency retention for 2,4-dichlorophenol after seven cycles. These results suggested that immobilized laccase possessed great reusability, improved thermal stability, and excellent storage stability. Organic–inorganic nanomaterials have a good application prospect for laccase immobilization, and the immobilized laccase of this work may provide a practical application for the removal of phenolic pollutants.

关键词: polydopamine     pollutant removal     thermodynamic     phenolic pollutants     immobilized laccase    

New insights into mercury removal mechanism on CeO

Ling Li, Yu He, Xia Lu

《环境科学与工程前沿(英文)》 2018年 第12卷 第2期 doi: 10.1007/s11783-018-1007-1

摘要: First-principles calculations were performed to investigate the mechanism of Hg adsorption and oxidation on CeO (111). Surface oxygen activated by the reduction of Ce to Ce was vital to Hg adsorption and oxidation processes. Hg was fully oxidized by the surface lattice oxygen on CeO (111), without using any other oxidizing agents. HCl could dissociate and react with the Hg adatom on CeO (111) to form adsorbed Hg–Cl or Cl–Hg–Cl groups, which promoted the desorption of oxidized Hg and prevented CeO catalyst deactivation. In contrast, O–H and H–O–H groups formed during HCl adsorption consumed the active surface oxygen and prohibited Hg oxidation. The consumed surface oxygen was replenished by adding O into the flue gas. We proposed that oxidized Hg desorption and maintenance of sufficient active surface oxygen were the rate-determining steps of Hg removal on CeO -based catalysts. We believe that our thorough understanding and new insights into the mechanism of the Hg removal process will help provide guidelines for developing novel CeO -based catalysts and enhance the Hg removal efficiency.

关键词: Elemental mercury removal     Surface adsorption     Ceria     First-principles calculations    

标题 作者 时间 类型 操作

Research progress in removal of trace carbon dioxide from closed spaces

ZHANG Yatao, FAN Lihai, ZHANG Lin, CHEN Huanlin

期刊论文

Removal of SO

Xiaolei LI, Chunying ZHU, Youguang MA

期刊论文

Scrap Iron Filings assisted nitrate and phosphate removal in low C/N waters using mixed microbial culture

期刊论文

Mercury removal from flue gas using nitrate as an electron acceptor in a membrane biofilm reactor

期刊论文

Analysis of Flue Gas Pollutants Deep-removal Technology in Coal-fired Power Plants

Xiao-lu Zhang

期刊论文

of magnetic multi-template molecularly imprinted polymer composite for the selective and efficient removal

期刊论文

Preparation and selection of Fe-Cu sorbent for COS removal in syngas

Bowu CHENG, Zhaofei CAO, Yong BAI, Dexiang ZHANG

期刊论文

Phosphorous removal from wastewater by lanthanum modified Y zeolites

Weikang ZHANG, Ye TIAN

期刊论文

Simultaneous enhanced ammonia and nitrate removal from secondary effluent in constructed wetlands using

期刊论文

Hongshiyan Landslide Dam Danger Removal and Coordinated Management

Ning Liu

期刊论文

Enhanced nutrients removal from municipal wastewater through biological phosphorus removal followed by

Yandong Yang,Liang Zhang,Hedong Shao,Shujun Zhang,Pengchao Gu,Yongzhen Peng

期刊论文

Han Huang:Deformation and Removal of Semiconductor and Laser Crystals at Extremely Small Scales(2019年

2021年04月23日

会议视频

VALORIZATION OF BIOGAS THROUGH SIMULTANEOUS CO AND HS REMOVAL BY RENEWABLE AQUEOUS AMMONIA SOLUTION IN

期刊论文

Immobilization of laccase on organic–inorganic nanocomposites and its application in the removal of phenolic

期刊论文

New insights into mercury removal mechanism on CeO

Ling Li, Yu He, Xia Lu

期刊论文