1,2,4-trichlorobenzene decomposition using non-thermal plasma technology

Non-thermal plasma(NTP)is regarded as a potential application for environmental pollution control due to its ability to remove pollutants.As a major precursor of dioxins,the influence of the parameters of 1,2,4-trichlorobenzene(TCB)decomposition using NTP technology was investigated through a series of experiments,including voltage,frequency,water content,initial concentration,flow rate,and oxygen content.The experimental results show that the energy injected into the NTP system has a positive correlation to voltage and frequency.Oxygen has the greatest influence on TCB decomposition.The optimal reaction condition was at 15 kV,1000 Hz,an initial concentration of 20 mg m^?3,a flow rate of 2 l min^?1,H2O at 4%,and O2 at 0%.Under this condition,the TCB removal efficiency could reach 92%.According to the generated product backstepping,the hydroxyl radical(·OH)plays an important role in TCB decomposition due to its strong oxidation,which participates in the dechlorination and oxidation reactions as free radicals,and the possible decomposition pathway of TCB by NTP is inferred from the identified byproducts.It is of great significance to investigate the influence of the parameters of TCB decomposition using NTP technology in order to provide references for industrial application.     

粉煤灰制备13X分子筛及VOCs吸附性能研究

粉煤灰属于大宗工业固废,极大地危害着自然环境和人类的身心健康,如何高效高值化利用粉煤灰是目前面临的科学和技术问题。挥发性有机物(VOCs)是具有挥发性的有机污染物,对人体有"三致"作用。分子筛因其独特的孔结构,具有优良的离子交换、催化和吸附性能,在众多领域得到广泛应用。采用碱熔活化结合水热合成法利用粉煤灰制备13X分子筛,分析了硅铝比、碱度、晶化时间因素对制备分子筛的影响,考察了VOCs吸附性能并与活性炭对比分析。利用XRD、SEM和BET手段对分子筛晶型、比表面积和孔径等结构进行表征,结果表明:13X分子筛结晶度好且纯度高,粒径为1～3μm分布基本均匀,BET比表面积达到990.3 m2/g,总孔容约为0.72 cm3/g,平均孔径为1.1 nm;母液硅铝比影响分子筛合成类型;提高碱度可以加快晶化速率,缩短晶化时间,促进硅酸盐离子与铝酸盐离子的缩聚反应;分子筛在晶化阶段生长较快。通过13X分子筛和煤基颗粒活性炭对VOCs吸附性能对比试验发现,13X分子筛VOCs吸附容量高于活性炭,且VOCs分子极性越大,吸附容量越高。研究不仅可达到固废和废气之间"以废治废,变废为宝"的目的,同时还为...     

中美页岩气水力压裂返排液环境影响与治理

对比分析中美页岩气水力压裂返排液,发现两者均具有产生量大、成分复杂、难生物降解、高COD、高 TSS、高TDS等特点,若压裂返排液进入到地表水及土壤中,可能造成不利影响,甚至对人类健康造成 影响。目前常用的处理压裂返排液的技术有深井回注法、处理后回用法及处理后排放法。我国页岩气水力压 裂返排液处理技术尚不成熟,部分地区仍沿用石油行业处理采出水的方法;部分页岩气田以借鉴国外压裂返排 液处理技术为主,结合自身返排液情况制定处理流程;返排液回收后重新用于水力压裂的水处理技术还不成 熟,应积极开展压裂返排液处理技术的研究。     

大艺术家·风景——桂林兴进漓江郡府江景别墅

<正>从美学的角度来看,桂林的特点清、奇、巧、变,撑起了文人墨客的向往,景只是开端,文化生活才是这座城的核心所在。秀丽的风情静谧地落在这片山水人文宝地,处处展现出了一个山水与人文共生融合的艺术之境影。《大艺术家·风景》兴进漓江郡府江景顶层别墅,取唐代诗人宋之问先生"桂林风景异,秋似洛阳春"一佳句而展开创作,作品呈现出人们所向往的丹青水墨视觉佳境,在传承千年文风同时,力求将设计与建筑、自然环境结合起来,在住宅融入山川风景,仁者乐山,智者乐水,这是栖居的最高境界,缔造真正代表时代的顶级人居地标。