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To measure space charge density around UHVDC transmission lines, a measuring device is developed based on air filtration methods. The device, which uses STM32 microcontroller as the core controller, collects charged particles in the air by adsorption material. Through the charge to voltage converting circuit, charges absorbed are transferred into a voltage signal and are collected by microcontroller...
Adsorption of molasses effluent by activated carbon (AC) was investigated in this study. The effect of AC type on decolorization rates was compared and influential factors such absorbent doses, initial pH, adsorption time and temperature were evaluated. The results shows that the decolorization capacity is in the order of powered activated carbon (PAC) > granular activated carbon (GAC) > cylindrical...
This project has researched combined technology of the transformation from bathing wastewater to drinking water, then developed the removable military equipment in small volume. Turbidity, CODMn and coliform group removal rate is separately 99.5%, 92% and 100% via the process combined of Coagulation-Sedimentation-quartz sand filtration-activated carbon adsorption-Ultrafiltration-ozone disinfection,...
The paper studied an approach to purification of CS2 waste gas in low concentration using biological trickling filter. The results of preliminary experiment showed that, when the gas flow was 100-500mg/m3, the CS2 removal efficiency arrives percent 70-78% by using trickling filter, But the biological elimination of CS2 in waste gas could be increased from 2.06mg/(L h) to 22.52mg/(L h); meanwhile the...
This study investigates the effects of toluene adsorption on the filtration efficiency of nanoparticles by a fluidized-bed adsorption reactor. Simulated flue gas is modified by different types of nanoparticle (SiO2 and Al2O3) with various particle sizes (10 and 80 nm) are also carried out in experiment. Therefore, the experimental results show that the removal efficiencies of the nanoparticles and...
The present study was conducted to investigate the heavy metals (HMS) removal from aqueous solutions in Complex ecosystem filter (CEF) with vermiculite substrate. Experimental results showed that the CEF was highly effectively in removal of HMS and the average removal rates of Cu2+, Zn2+, Pb2+ and Cd2+ were 81.60%, 80.55%, 83.20% and 62.21% respectively, under the hydraulic loading of 2.0m3/m2.d....
This paper aims at exploring the feasibility of adsorption filtration technology using reclaimed iron sludge coated sand (RISCS) as filter media for municipal wastewater reuse. The iron sludge as surplus waste solution derived from ferric-carbon micro-electrolysis process. Scanning electron microscope (SEM), Infrared spectroscopy (IR) and X-ray diffraction (XRD) analysis were used to investigate the...
The performance and enhancement of pollutants removal in raw municipal sewage by a new pretreatment process were investigated in this study. The experiments were carried out with a GS sedimentation tank in full scale plant. The results revealed that average removal efficiency of TP, TSS, and TN achieved 49%, 67.3% and 20% respectively during stable running period. TSS removal rate could achieve about...
Ammonium adsorption characteristics of the denitrifying filter and the biologically aerated filter backwashed sludge and influence factors such as sludge concentration, sludge activity and effect of chemical coagulants were investigated. Ammonium was found to be adsorbed to both kinds of backwashed sludge. The backwashed sludge in biologically aerated filter adsorbed more ammonium than that in denitrifying...
Since humic acid from water causes considerable serious health-risk factors, powerful methods for the removal of those have received increasing attention over the past decade. In this paper, the available technologies for removal of humic acid from water are briefly reviewed, and the recent advancements are summarized. Fundamentals and main applications of typical methods such as filtration, flocculation...
The objective of this study is to further evaluate the relationship between removal effect of dissolved organic pollutants (DOC) and their characteristics (biodegradability, adsorbability and molecular size distribution) in different running stage of BAC filter. The experimental results showed that during early period of operation, BAC filter mainly removed adsorbable DOC (that is ADOC), but after...
Affinity ultrafiltration as a new filtration technology has both the advantages of affinity purification and membrane separation. In this study, the dextran T2000 (dextran with nominal molecular weight of 2 million) was employed, after epichlorohydrin activation and coupled with PAB (P-aminobenzamidine) as affinity ligand, we got affinity ultrafiltration carrier with the ligand concentration of 108...
Phosphorus is one of the key elements necessary for the growth of microorganism in drinking water. It stimulates the growth and/or regrowth of microorganism and reduced biostability in drinking water. The demand for effective and inexpensive technology is to increase in response to the widespread recognition of the deleterious health effects of microorganism risk in pipe network. In this study, activated...
Experiments on adsorption for phosphorus by activated carbon, zeolite and ceramisite were conducted. The results show that adsorption capacity order of three filter media from high to low is activated carbon, zeolite and ceramisite. Influential factors which affect the adsorption capacity were surveyed. According to the analysis, the first factor is that surface isoelectric point pH of activated carbon...
Laboratory-scale batch experiments were conducted for investigating the adsorption of bisphenol A (BPA) at mg/L range onto activated sludge liquid. In batch adsorption experiments, all the adsorption isotherms obtained were found to fit the fifth species in five common types of adsorption isotherms at 25°C. The adsorption reached equilibrium quickly within 30mins, the maximum amount adsorbed was 1...
As a clay mineral material, the vermiculite does well in the auto-absorption to the pollutants in the flowing water on the pavement. The paper according to the passage collecting pool purifying filtration system of the project of Hengda Section belonging to Daguang Freeway in Hebei Province, giving a briefly introduction of the apply of the vermiculite in this system.
A new polymer, oxidative Poly-Si-Fe (PSF) coagulant was prepared by an oxidization and copolymerization method. The influence of the oxidization of PSF on the adsorption of humid acid (HA) was explored, in comparison with that of polyferric aluminum (PFA). The results show that PSF changes the molecular structure of HA, leading to the improvement of adsorption of HA.
Adsorption of p-chloronitrobenzene(pCNB) onto mesoporous molecular sieves (HMS) from aqueous solution has been investigated systematically using batch experiments in this study. Results indicate that p-chloronitrobenzene(pCNB) adsorption is initially rapid and the adsorption process reaches a steady state after 1 minute. The adsorption isotherms are well described by the Langmuir and the Freundlich...
The regular methods for nickel removal such as activated carbon adsorption are always complicated in process and expensive in construction and maintenance. In this research coal fly ash, usually taken as industrial waste, was synthesized into particle filter material, and then the latter was used as absorbent for nickel removal from aqueous water. The physical and chemical properties of this material...
In this paper, we studied the removal of high fluoride from drinking water treated by two new fly ash filter materials A and S. The results showed that both filter materials can be used for adsorbing fluoride, the adsorption type is Freundlich, a multi-adsorption with medium coverage; the required mass of adsorbents for an aqueous solution of 1 m3 with 4 mg/L concentration of fluoride are 2.46 kg...
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