改性沸石对废水中锰的吸附研究

采用吸附法去除水体中重金属锰,以NaOH对天然沸石改性,对含Mn的水体进行处理,通过单因素实验系统考察了改性沸石用量、吸附时间、初始浓度、温度对吸附效果的影响,研究结果表明在25℃,吸附剂用量为1.0 g,吸附时间120 min,对初始浓度为1.0 mg/L时,锰的去除率可达到99.3%,最大吸附容量达到9.93 mg/g。     

改性斜发沸石吸附水中腐殖酸的研究

采用十六烷基三甲基溴化铵改性天然斜发沸石,考察了吸附时间、吸附剂投量、腐殖酸起始浓度和pH对改性沸石吸附腐殖酸的影响。结果表明,在温度为25℃、pH=3、改性沸石投量为2g／L、水中腐殖酸起始浓度为10mg／L的条件下,改性沸石静态吸附120min后对腐殖酸的去除率可达95．2％。采用Langmuir和Freundlich吸附等温式拟合改性沸石对腐殖酸的吸附表明,改性沸石对腐殖酸的吸附能够很好地符合Langmuir吸附等温式,理论最大吸附量为18．529mg／g,说明改性斜发沸石是一种吸附水中腐殖酸的良好吸附剂。     

改性沸石吸附处理氨氮废水试验研究

在静态条件下研究了改性沸石对氨氮的吸附特性,考察了不同条件下改性沸石对含氨氮废水的处理能力。结果表明：热改性温度为500℃、pH值为7、改性沸石加入量为30g／L、吸附时间120min条件下,改性沸石对氨氮的去除率可达95％以上。     

十二烷基苯磺酸钠改性沸石吸附甲基橙的研究

以表面活性剂十二烷基苯磺酸钠改性天然沸石,对废水中甲基橙进行吸附,以紫外可见分光光度计分析最佳吸附条件,结果表明：在改性沸石的用量为20g/L、吸附时间为100min、温度为35℃、pH值为4.2时,十二烷基苯磺酸钠改性沸石对甲基橙溶液（10g/L）的吸附率达到了92.8%,吸附符合Langmuir等温方程。     

改性沸石对Cr(Ⅵ)的吸附作用研究

研究了改性沸石对Cr（Ⅵ）吸附的影响因素,即研究了溶液酸度、吸附时间、吸附剂用量和Cr（Ⅵ）的初始浓度对吸附的影响．结果表明：溶液的pH值是影响吸附的主要因素;离子交换和表面络合反应是主要吸附形式;改性沸石对Cr（Ⅵ）的吸附符合Langmiur吸附等温式,属于单分子层吸附．     

改性沸石对Cr(VI)的吸附作用研究

研究了改性沸石对Cr(VI)吸附的影响因素,即研究了溶液酸度、吸附时间、吸附剂用量和Cr(VI)的初始浓度对吸附的影响.结果表明:溶液的pH值是影响吸附的主要因素;离子交换和表面络合反应是主要吸附形式;改性沸石对Cr(VI)的吸附符合Langmiur吸附等温式,属于单分子层吸附.     

超声改性沸石去除微污染原水中氨氮的研究

采用超声强化NaCl对天然沸石进行改性,考察了改性沸石对氨氮的吸附去除特性。结果表明,在超声功率为560 W、改性时间为40 min、NaCl浓度为0.8 mol/L的条件下制备的改性沸石对氨氮的去除效果最佳;在氨氮初始浓度为10 mg/L、改性沸石投加量为5 g/L的条件下,吸附40 min后改性沸石对氨氮的去除率可达到86.9%,120 min后达到吸附平衡,此时对氨氮的去除率为91.11%,相比天然沸石提高了86.3%;准二级反应动力学模型可以较好地描述改性沸石的吸附行为,R2=0.991;改性沸石对氨氮的吸附符合Langmuir模型(R2=0.961 2),其最大吸附量可达到12.56 mg/g。     

酸改性沸石处理含磷废水的制备条件研究

沸石由于其多孔的特性可以作为水体吸附剂,但天然沸石的吸附容量较低,需要通过改性提高其吸附性能。本文对沸石进行酸改性,探讨酸的种类、浓度、时间、固液比,确定最优的改性条件。实验结果表明对于处理100 m L,2 mg/L的含磷溶液,盐酸改性浓度为4 mol/L,改性时间为2 h,固液比为1∶10,所得最佳磷去除率为50.50%。硫酸改性沸石的最佳条件为硫酸浓度7%,改性时间2 h,固液比1∶10,磷去除率为45.85%。     

氧化镁改性沸石处理猪场废水的研究

在不同作用时间和pH下,采用动态吸附方法,考察了氧化镁改性沸石对猪场废水的处理效果.结果表明:在不同作用时间和pH下,改性沸石对猪场废水的处理效果均好于天然沸石的;最佳作用时间为4 h,此时改性沸石对氨氮、总磷的去除率分别为88.6%和76.2%;改性沸石去除氨氮的最佳pH值为7,此时去除率为88.7%;改性沸石去除总磷的最佳pH值为9,此时去除率为86.3%.     

改性木屑对尿液废水中氨氮的吸附性能研究

采用热解+NaOH浸泡改性处理杨木屑和杉木屑,用于吸附处理尿液废水中的氨氮,对比木屑改性前后对氨氮的吸附效果.结合吸附动力学与吸附等温线模型分析,考察了吸附剂与废水接触时间、水温、废水pH和吸附剂投加量等因素对氨氮去除效果的影响.结果表明,木屑改性后比表面积增大,孔洞结构明显,对氨氮的吸附效果较改性前有显著提升;吸附反...     

Adsorption of Pb and Cd by amine-modified zeolite

Natural zeolites, known for their excellent sorption properties towards metal cations, are widely used for the purification of wastewaters. The selectivity of clinoptilolite, a common zeolite mineral, for Pb is known to be particularly high, whereas its selectivity for Cd is often lower. Extraordinarily high sorption capacities for soft metal cations were observed in the case of thiol-functionalized silica gels and clays. In order to enhance the zeolites' sorption capacity for Cd, we treated natural heteroionic and Na-clinoptilolite in aqueous suspensions with cysteamine and propylamine solutions and investigated the sorption of Cd and Pb to amine-modified zeolite by a series of batch experiments. Stability constants for amine sorption on all zeolite samples at room temperature and 50 degrees C were obtained. Partial dimerization of cysteamine explains the enhanced sorption of this compound. In contrast, amine treatment did not enhance the adsorption capacity or selectivity of the clinoptilolite towards Cd and Pb. Instead, the amounts of adsorbed heavy metals decreased stoichometrically with increasing sorption of cysteamine and propylamine. This reduction can be explained by the blockage of channels by amine molecules and revealed that the modification of zeolites with mercaptoamines does not enhance the sorption capacity of zeolite for Cd and Pb.     

养殖废水处理工程

采用厌氧反应器（UASB）＋好氧接触生物反应器（OC）组合工艺处理养猪场高浓度有机废水,结果表明：工艺运行稳定,出水COD,BOD5,氨氮和SS的值分别为135 mg/L,28 mg/L,12 mg/L和100 mg/L,出水各项指标均达到GB8978-1996污水综合排放标准二级排放标准。     

Adsorption of wastewater components by natural sorbents

Sorptive properties of the natural zeolite from the Sokyrnytsia Deposit have been investigated with respect to the pollution components of wastewaters from meat-processing plants, namely, ammonium nitrogen, phosphates, and protein, the concentrations of which are subject to standards. Equilibrium values of the adsorption capacity were determined and appropriate sorption isotherms were built for temperature 20°C. It was shown that the adsorption capacity of clinoptilolite with respect to one-component systems was higher as compared with the case of simultaneous adsorption of two and three components from the solution. The linear relationships of the adsorption isotherms for one-, two-, and three-component systems have been also proposed.     

沸石法去除生活污水中氨氮的研究

分别用沸石柱及沸石微生物柱处理生活污水中的氨氮,并研究沸石质量、pH值、吸附时间对沸石去除氨氮的影响.研究表明:沸石投加量越大,氨氮去除效果越好,沸石的吸附容量越小;pH值对氨氮的去除影响较大,pH在8附近时氨氮去除效果最好;随时间的延长能增加沸石对氨氮的去除.对于进水氨氮为60.34mg/L的生活污水,沸石柱去除效率最低可达77.43%,沸石微生物柱的去除效率最低可达87.32%.     

Halophyte filter beds for treatment of saline wastewater from aquaculture

The expansion of aquaculture and the recent development of more intensive land-based marine farms require efficient and cost-effective systems for treatment of highly nutrient-rich saline wastewater. Constructed wetlands with halophytic plants offer the potential for waste-stream treatment combined with production of valuable secondary plant crops. Pilot wetland filter beds, constructed in triplicate and planted with the saltmarsh plant Salicornia europaea, were evaluated over 88 days under commercial operating conditions on a marine fish and shrimp farm. Nitrogen waste was primarily in the form of dissolved inorganic nitrogen (TDIN) and was removed by 98.2 ± 2.2% under ambient loadings of 109-383 μmol l⁻¹. There was a linear relationship between TDIN uptake and loading over the range of inputs tested. At peak loadings of up to 8185 ± 590 μmol l⁻¹ (equivalent to 600 mmol N m⁻² d⁻¹), the filter beds removed between 30 and 58% (250 mmol N m⁻² d⁻¹) of influent TDIN. Influent dissolved inorganic phosphorus levels ranged from 34 to 90 μmol l⁻¹, with 36-89% reduction under routine operations. Dissolved organic nitrogen (DON) loadings were lower (11-144 μmol l⁻¹), and between 23 and 69% of influent DON was removed during routine operation, with no significant removal of DON under high TDIN loading. Over the 88-day study, cumulative nitrogen removal was 1.28 mol m⁻², of which 1.09 mol m⁻² was retained in plant tissue, with plant uptake ranging from 2.4 to 27.0 mmol N g⁻¹ dry weight d⁻¹. The results demonstrate the effectiveness of N and P removal from wastewater from land-based intensive marine aquaculture farms by constructed wetlands planted with S. europaea.     

Confronting the realities of wastewater aquaculture in peri-urban Kolkata with bioeconomic modelling

Wastewater reuse for aquaculture is a reality in several Asian countries, however, traditional practices face constraints including inadequate or contaminated wastewater inputs and growing concern over health risks. Based on Kolkata and a wastewater flow of 550,000m(3)d(-1), rational and conventional designs for lagoon-based wastewater treatment and reuse through aquaculture were compared using bioeconomic modelling. Outcomes showed the rational design required a larger area than the conventional or traditional systems, but that financial returns, nutrient retention and fish production were higher; gross fish production employing rational and conventional designs was 45,500 and 11,560t, respectively. However, limited land availability and constraints to reconfiguring the existing system make implementation of the rational design unlikely. Findings suggest traditional practices could be enhanced by adopting wastewater treatment prior to reuse, modifying fish production strategies, and monitoring to safeguard health. Bioeconomic modelling constitutes a useful tool in comparing treatment and reuse options, permitting the sensitivity of financial returns to changing costs and recent revisions to WHO guidelines for safe wastewater reuse to be assessed, however, social and environmental consequences demand consideration.     

Perceived health problems among users of wastewater for aquaculture in Southeast Asian cities

To obtain essential information for the planning of epidemiological studies on health risks of exposure to wastewater in aquaculture, a total of 3089 people from 606 households involved in aquaculture in Phnom Penh, Hanoi and Ho Chi Minh City were interviewed in a cross-sectional survey in May 2004. In this study household members were asked about health problems that they had experienced. Our results indicate that the most important health problem associated with wastewater exposure was skin problems, reported by 4% of all people surveyed. Contact with wastewater was an important factor associated with self-reported skin problems. The study suggests that exposure to wastewater is a risk factor for skin problems.     

沸石用于城市污水深度处理的实验研究

介绍了沸石的主要性能参数 ,对其用于城市污水深度处理的试验方法与工艺流程作了阐述 ,并结合沸石滤柱的运行情况 ,指出沸石作为一种填料用于污水深度处理是可行的。     

Adsorption of basic dyes on granular activated carbon and natural zeolite

The adsorption of basic dyes from aqueous solution onto granular activated carbon and natural zeolite has been studied using an agitated batch adsorber. The influence of agitation, initial dye concentration and adsorbent mass has been studied. The parameters of Langmuir and Freundlich adsorption isotherms have been determined using the adsorption data. Homogeneous diffusion model (solid diffusion) combined with external mass transfer resistance is proposed for the kinetic investigation. The dependence of solid diffusion coefficient on initial concentration and mass adsorbent is represented by the simple empirical equations.