D402树脂对Pb(Ⅱ)、Cd(Ⅱ)的吸附性能及再生试验研究

通过静态和动态吸附实验研究了氨基膦酸树脂D402对水中Pb(Ⅱ)、Cd(Ⅱ)的吸附性能及其再生方法。结果表明,D402树脂对Pb,Cd的吸附均符合Freundlich方程,静态吸附Pb(Ⅱ)、Cd(Ⅱ)的最佳p H值为6.0左右,采用HCl-Na OH二阶段再生方式最佳,Pb(Ⅱ)、Cd(Ⅱ)再生度分别达到93.2%,81%。模拟某有色矿山废水,在动态条件下,出水以满足地表水Ⅲ类标准为要求,反复运行再生7次后,D402对Pb(Ⅱ)、Cd(Ⅱ)的吸附量仍能达到初始吸附量的80%以上。     

烧结烟气中氨-络合法同步脱硫脱硝络合剂再生的实验研究

对氨-络合法同步脱硫脱硝废液中络合剂再生进行了实验研究。结果表明,在50℃、p H值为5.65、Fe(Ⅱ)-EDTA浓度为0.04 mol/L、再生剂/Fe(Ⅱ)EDTA为2∶1的条件下,经铁粉再生后吸收液最高脱硫脱硝效率分别达到99%和75%;焦粉再生最高脱硫脱硝效率达到97%和46%;而乙二醛再生最高脱硫脱硝效率仅为80%和20%。同时铁粉再生中试结果也还表明脱硫效果可以稳定在100%,脱硝效果可维持在60%。     

废旧手机电池中钴和锂的回收及再利用研究

废旧手机电池进行人工拆解后,将正极浸入N-甲基吡咯烷酮(NMP)中,使正极活性物质与铝箔分离.再利用酸浸-碱出方法回收正极活性物质中的钴和锂.确定最佳工艺参数为:0.8 molg·L-1的硫酸溶液,反应温度50℃,固液比1∶20g· L-1,水浴加热60 min.用饱和Na2CO3溶液沉淀锂得到Li2CO3,NaOH溶液将钴沉淀,400℃煅烧3h得到Co3 O4.按化学计量比将Co3O4与Li2CO3混合,预处理后700℃煅烧7h得到LiCoO2粉末.对再生的LiCoO2进行了结构和形貌测试,表明再生后生成了颗粒均匀、结晶度较好的LiCoO2.     

膜/电容脱盐(MCDI)特性研究

以NaCl溶液为除盐对象,采用控制变量法,考察电压、流量、温度和进水浓度对膜/电容脱盐(MCDI)除盐效果的影响以及再生方式对MCDI再生效果的影响.结果表明:MCDI的除盐率随电压和温度的升高而增大,随进水流量和浓度的增大而减小;综合考虑除盐率和能量利用效率,在电压1.2 V、流量5.0~7.5 m L·min-1、温度20~25℃、浓度50~250 mg·L-1时,MCDI的除盐性能最佳;再生时,反接方式再生效率最高但耗能大,断路方式几乎无再生效果,短接方式再生效率良好且无耗能,综合考虑短接方式最佳.     

改性壳聚糖季铵盐的研制及其对高氯酸盐的吸附研究

通过将壳聚糖季铵盐改性以实现固定化,并用于水体中ClO 4-的吸附去除,研究了改性过程相关工艺参数对产物吸附能力的影响,考察了产物的吸附和再生性能.结果表明,戊二醛的交联性能优于甲醛和环氧氯丙烷的交联性能,戊二醛的最佳投加量为6.82%,最佳的反应温度为45℃,pH值在3～12之间交联反应均能很好地进行,从而实现壳聚糖...     

Synergistic effects of non-thermal plasma-assisted catalyst and ultrasound on toluene removal

A wire-mesh catalyst coated by La_0.8Sr_0.2MnO₃ was combined with a dielectric barrier discharge (DBD) reactor for toluene removal at atmospheric pressure. It was found that toluene removal efficiency and carbon dioxide selectivity were enhanced in the catalytic packed-bed reactor. In addition, ozone and nitrogen monoxide from the gas effluent byproducts decreased. This is the first time that ultrasound combined with plasma has been used for toluene removal. A synergistic effect on toluene removal was observed in the plasma-assisted ultrasound system. At the same time, the system increased toluene conversion and reduced ozone emission.     

磷钼杂多化合物脱硫体系脱硫特性与再生规律

以液相氧化脱硫工艺开发为目的,采用尾气H₂S浓度动态监测法研究了磷钼杂多化合物脱硫体系的脱硫特性;采用氧化还原电位监测法研究了该体系的再生规律结果表明,磷钼酸钠（NaHPA）体系的脱硫性能随温度升高而有所降低,随进气H₂S浓度的提高而相应降低,随吸收剂浓度的提高而显著增强．几种主要因素对磷钼酸钠脱硫体系再生过程的影响规律为吸收剂浓度提高再生时间缩短;温度升高再生时间缩短温度超过 50℃冉生时间缩短幅度趋缓;增大空气流最冉生时间缩短,空气流量超过1.650Lmmin冉生时间趋于恒定：进气 H₂S浓度提高冉生时间延长．NaHPA复配体系的再生性能较单一的NaHPA为优,偏钒酸钠对体系的再生有催化作用     

一种废机械油再生处理装置的设计

根据废机械油的资源循环利用需求,设计了一套废机械油再生处理装置,介绍了该装置的工作性能特点和结构组成原理。结合工厂试验测得此套机械油再生处理装置具有去除杂质、脱水、脱气和脱色的明显效果,对节能减排具有一定的意义。     

Soil drying in a tropical forest: Three distinct environments controlled by gap size

Soil water and temperature regimes in the tropical moist forest on Barro Colorado Island, Panama, were simulated directly from meteorological data using the model SWEAT. Separate field observations from root-exclusion, litter-removal and control treatments in one small and one large forest gap were used for calibration and validation. After irrigating all treatments to field capacity, soil matric potential and temperature were measured over 17 days at four depths ≤50 mm using the filter-paper technique and bead thermistors. Understorey environments were also simulated under the same initial conditions. The results suggest that three distinct scenarios, controlled by gap size, describe how the above- and below-ground processes controlling soil drying are coupled: (1) in the large gap, root water extraction by surrounding trees is negligible so soil drying is dominated by evaporation from the soil surface. Soil temperature is dominated by direct solar heating and cooling due to evaporation. (2) In the small gap, root water extraction dominates soil drying with soil evaporation playing a minor role. Soil temperature is still dominated by direct sunlight with some cooling due to evaporation. (3) In the understorey, root water extraction dominates soil drying. Soil temperature is dominated by heat conduction from deep soil layers with some evaporation and sensible heat transfer. The contrasting soil drying regimes imposed by variation in canopy structure enhance micro-environmental heterogeneity and the scope for differential germination and seedling establishment in coexisting tropical tree species.     

ZnFe_2O_4/AC脱硫剂再生方法的比较

采用水洗再生、N_2及N_2+NH_3气氛下的热再生以及微波辐射再生的方式对饱和ZnFe_2O_4/活性炭(AC)脱硫剂进行再生,并通过SEM,XRD,TG等技术进行表征。实验结果表明:水洗温度为90℃时,第一次水洗后ZnFe_2O_4/AC脱硫剂对SO_2的吸附容量(硫容)为122.0 mg/g;N_2氛围下热再生的最佳温度为500℃,ZnFe_2O_4/AC脱硫剂的硫容可达97.2 mg/g;N_2+NH_3氛围下热再生的最佳温度为400℃,ZnFe_2O_4/AC脱硫剂的硫容达到101.2 mg/g;当微波功率为100 W时,ZnFe_2O_4/AC脱硫剂的硫容为87.2 mg/g。对比三种再生方式,一次水洗再生具有更好的再生效果。