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SBR process of A/O/A/O many-point-water-inflow mode was investigated to treat landfill leachate. When the HRT of four stages were respectively A(2.0h)/O(10.0h)/A(2.0h)/O(6.0h), the influent of two anoxic stages were added in the proportion of 2:1, excretion ratio was 1/3, pH of influent was 7.5~8.0, the results showed that the removal rate of CODCr, NH3-N and TN were 71.7%, 92.4% and 69.8% respectively...
The present paper proposes the application of sodium trititanate whisker as solid sorbent for trace cadmium pre-concentration/separation using a static system coupled with flame atomic adsorption spectrometry (FAAS). The method comprised the pre-concentration of Cd(II) ions at a buffered solution (pH 5.0) onto 0.25 g of sorbent previously activated by 3.0 mol/L of HNO3. The elution step was carried...
Urban rivers are closely related to the social and economic life. But urban rivers were polluted in different degrees. This paper explores Tianjin Outer Ring Sewage River and Jinhe River to conduct water quality analysis. The results showed that both rivers were polluted. Measures are suggested to improve the water quality. The paper can be used as a basic data for the pollution state and to provide...
The utilization of rainwater is essential to improve ecological environment of sub-district, and is one of main approaches to achieve sustainable water resources.Taking rainwater collection and utilization of Beifang Garden district as an example in Fuxin city of northeast China, water quality analysis and water quantity balance calculations are completed, also the feasibility and necessity of rainwater...
The paper adopts the chemical speciation method of direct oxidation to prepare polyferric sulfate (PFS), taking the ferrous sulfate(FeSO4·7H2O) as the raw material, and then compounds PFS with a certain quantity of polyacrylamide (PAM) to produce a stable homogeneous phase composite flocculent, polyferric sulfate - Polyacrylamide (PFS-PAM). In addition, the paper employs Kaolin clay suspension as...
A study of the method of using green copperas (FeSO4.7H2O), sodium silicate (Na2SiO3), concentrated sulphuric acid (H2SO4) for inorganic polymer flocculant polyferric silicate sulfate (PFSS) is conducted. The effects of w(SiO2%) in Na2SiO3 solution, n(Fe)/n(Si), silicic acid activated time and pH value on the synthesis of PFSS are investigated. The method of preparing PFSS includes following steps:...
The biological purification device that combined the aeration-ship technology and biological contact oxidation was applied to the eutrophic river water treatment of Dongfeng channel in Zhengzhou. The removal efficiency of combined packing and elastic packing to chemical oxygen demand, NH3-N, TP in different dissolved oxygen (DO) and hydraulic loading showed that combined packing performance was better...
Methyl tert-butyl ether (MTBE) is a common additive for producing a clean burning fuel with a higher Octane number and less emissions. Batch adsorptive capacity, continuous flow breakthrough and biological activated carbon (BAC) treatment experiments were conducted to compare the adsorptive capacities of four activated carbons for MTBE, to obtain the adsorptive capacity indicators useful for predicting...
Polymer Si-Fe (PSF) coagulant was prepared by co-polymerization. The oxidization of PSF was investigated by using jar test for humic acid (HA) solution sample and measuring oxidization-reduction potential (ORP) compared with that of polyferric aluminum (PFA). The results show that PSF has higher ORP value than PFA, with the difference of 420mV. PSF is an oxidization coagulant that possibly changes...
This paper mainly based on the new processes of ozone-floating filter and ozone floatation which were tested in the water from the Queshan Reservoir. The process of ozone floating filter stated that little influence ccurred when the raw water was pre-treated by the ozone. UV254(Ultraviolet Rays)was removed in large amount (76.47%) if the ozone oxidation had been adopted. The removal rate could achieve...
The modification methods on artificial zeolite by NH4Cl-FeCl3 and NH4Cl-KAl(SO4)2 were studied by the experiment. The mechanism on modifying adsorbent was preliminarily discussed. The main technical parameters were determined on adsorption treatment of high fluoride drinking water using modified artificial zeolite. The key factors of affecting the F- removal efficiency were revealed. The study provided...
Degradation of polyacrylamide(PAM) in aqueous solution was studied by using Fe2O3/Al2O3 or Fe2O3/carbon as heterogeneous catalyst in the presence of H2O2. In order to improve the catalytic activity, Effects of catalyst preparation conditions as impregnated materials, acid dipping and adding trace elements to catalyst activity were studied in the experiment. It was observed that Compared with Fe2(SO4)3,...
Increasing evidence suggests that nanoscale zero valent iron (nZVI) is one of best materials for the treatment of heavy metal ions in water. In this work, the reduction of Cr(VI) by nZVI was investigated. Laboratory experiments with varied Cr(VI) concentrations and nZVI doses were performed. Chromium removal efficiency decreases as the ratio [Cr(VI)]/nZVI increases due to the limited reaction sites...
Immobilized microorganism technology is an effective method of removing water pollutant in source waters. The effect of biologically immobilized ceramic particles is better in removing the pollutant than simple filter or engineering bacteria liquid, due to the two factors including the adsorption and entrapment function of the filter materials in the biofilter and the biodegradation of the microorganisms...
One of China largest river, Songhua River was polluted due to the explosion at a PetroChina factory in Jilin province in 2005. A full scale test was carried out to investigate the removal of nitrobenzene in the raw water from polluted Songhua River. The removal and control effects of nitrobenzene by using Powered Activated Carbon (PAC) absorption and Granular Activated Carbon (GAC) filtration as emergent...
In this paper, start-up of fiber activated carbon for natural start-up in a dynamic flow was discussed, and several physical-chemical, biochemical and microbiological methods (indicators), such as NH3-N, NO2-N, UV254, CODMn, DOC and AOC, were used to characterize the BAC biofilm's composition and activity. The results showed that the mature biofilm was observed after 53 days of incessant operation...
Batch adsorption equilibrium experiments and continuous flow breakthrough experiments were conducted to compare the effectiveness of 7 granular activated carbons (GACs) in removing trichloroethylene (TCE) from groundwater. The order of GACs' adsorptive capacities for TCE was in the same order of their phenol numbers (indicator for internal surface of <;1 nm micropores). A small amount of methanol...
The organic micro-polluted water had seriously threatened the safety of human drinking water. Many purification methods were adopted to remove the trace organics, including the photocatalytic technique. In this study, the SiO2-TiO2 thin film coated polyacrylonitrile (PAN) yarn photocatalytic purifier developed by the sol-gel water vapor method was used for degradation of phenol in the micro-polluted...
The research objectives of the study are to manufacture nano-TiO2 with doping Fe3+, Ce3+ and La3+ adopting impregnation method, examine the effects of the preparing condition on catalyst performance, and explore the influence of the adding account of metal ions and different ion-combinations on the photocatalytic activity of modified nano-TiO2. The experiment results support the following three conclusions...
The water quality of lignite-derived water produced from Hot Press Upgrading (HPU) is in breach of the reuse standard for power plant's circulating cooling water. This study assesses the water characteristics of lignite-derived water as follows: The BOD5/COD ratio is 0.85. The pH value of lignite-derived water samples is from 6.65 to 6.85. The lignite-derived water's properties parameters such as...
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