Advanced Materials Research Vols. 518-523

Abstract: The characteristic of coal mine wastewater was introduced. Engineering design and practical run of circulator clarifier +gravity valve-less were summed up for treating wastewater of coal mine. Practice indicated that the process was steady and reliable, the effluent satisfied water quality Ⅲ standard of Surface Water Environmental Quality Standard (GB3838-2002),and there was remarkable economic results during the process of sewage treatment.

Abstract: Antimony (Sb) has received increasing environmental concerns due to its potential toxicity and carcinogenic property. In the present work, the flocculation process had used to treat dressing wastewater (DW) from some antimony mine, and the mechanism of removing Sb was investigated. The study focused on the effect of experimental parameters on the Sb removal efficiency, such as dosage of flocculant, pH value and the settling time. Several flocculants were evaluated and the results suggested that ferrous sulfate heptahydrate (FeSO₄•7H₂O) was the optimal choice. When the dosage of ferrous sulfate heptahydrate (FeSO₄•7H₂O) was 0.075:100, pH value was 7 and the settling time was 180 min, removal efficiency of Sb in the DW reached 99.86% and concentration of Sb in the treated wastewater was below 0.04mg/L, which meets the emission standards established by State Department of Environmental Protection and State Administration for Quality Supervision and Inspection and Quarantine.

Abstract: It concerns about escaped dust issues of Inner Mongolia Datang International Xilinhaote Mining CO, LTD.M102. M103. M106 among three belt drive. It will reform and design for dust comprehensive pollution control in belt drive, introduce practical application of High-pressure micro fog dedusting system in belt drive and capture dust particulate effectively in order to make dust fall in the beginning of producing dust by investigation on the site, current specific situation, local climate and water resource.

Abstract: Three methods, sodium hydroxide hydrothermal treatment, sodium carbonate calcination-hydrothermal treatment, and sodium hydroxide calcination-hydrothermal treatment, were used to modify fly ash as an adsorbent for wastewater treatment. Results from XRD analysis show that the fly ash with sodium hydroxide hydrothermal treatment the fly ash has a porous structure in which alumina disappear and silica is dissolved. With sodium carbonate calcination-hydrothermal treatment exhibits nepheline and Na₇Al₇SiO₁₆ structures. With sodium hydroxide calcination-hydrothermal treatment a zeolite-like new phase and porous structure can be observed. Results from SEM and BET indicate that the specific surface area increases from 0.160 m²/g for the raw material to 7.22 m²/g, 1.05m²/g and 276 m²/g for the respectively modified by sodium hydroxide hydrothermal treatment, sodium carbonate calcination-hydrothermal treatment and sodium hydroxide calcination-hydrothermal treatment. The three modified fly ash were used to treat a concentration of 80 mg/L of ammonia-nitrogen wastewater. The removal capacity for the three modified ash was 58%, 44% and 94% respectively that was significant higher than 14% for the original fly ash. These results show that fly ash by alkali modification can improve the activity and enhance the ability of ammonia-nitrogen wastewater treatment.

Abstract: Quantitative simulation of pollutions in river was the foundation of method to plan and manage river. The study used QUAL2E model to simulate pollutants changes, and permissible pollution bearing capacity of water bodies of Rizhao city was analyzed, then quantity goal of pollution reduced was calculated. The result can provide technical support for water resources protection plan of Rizhao city.

Abstract: Three kinds of seeding sludge, i.e. conventional activated sludge, anaerobic granular sludge and the nitrifying activated sludge from the nitritation reactor treating aged leachates were evaluated in batch mode to screen the optimized inoculum for the rapid start-up of ANAMMOX reactor. The feasibility of the ANAMMOX process for the treatment of aged leachates was also investigated in a modified upflow anaerobic sludge blanket (UASB, 0.05m3). The batch experiments revealed that the nitrifying activated sludge from the nitritation reactor could respectively achieve the NRR (nitrogen removal rate) of 0.0365 kg N/(m3.d) and the ARR (ammonium removal rate) of 0.013 kg N/(m3.d) on day 12, which were greatly higher than those of the other two tested sludge samples. The mixture of the aforementioned nitrifying activated sludge and anaerobic granular sludge was established as an effective inoculum for the prompt start-up of ANAMMOX reactor. The maximum total nitrogen removal rate of 0.826 kg N/(m3.d) could be obtained for the treatment of “old” leachates under NLR (nitrogen loading rate) of 1.028 kg N/(m3.d). It is concluded that the N-removal performance of ANAMMOX process is still to be improved for actual engineering application to aged landfill leachates.

Abstract: The computational parameter and statistical methods of pig fecal equivalent of the livestock and poultry manure in nanning County is determined in the current project based on the several surveys of local farming conditions, and pig excrement equivalent number from 2004 to 2009 are calculated. Based on pig fecal equivalent, we forecast poultry excrement load of early warning value from 2010 to 2015 year by using the GM (1, 1) model. The result indicates that from 2010 to 2015 the livestock manure emissions in nanning city increase from 18063400 tons to 19168900 tons, the average farm manure load reached 27.70 t/ha from 26.11 t/ha, the R value increases gradually, the agricultural non-point pollution thereat degree of animal manure actually assures the tendency of aggravating.

Abstract: A lab-scale sequencing batch biofilm reactor (SBBR) was developed to treat domestic wastewater. After one year’s operation, the results were obtained as follows: when the reaction carried out in 3 h, COD removal efficiency approached or reached the maximal value, up to 90%. The nitrification process of NH3-N needed 4 h, and NH3-N removal efficiency reached the maximal value. Moreover, according to the variation of TN , NO3--N and NO2--N concentration in the nitrification and denitrification process, when NH3-N degraded to zero or the minimal value, just two cycles ending, it means that the SBBR system completed the nitrification and denitrification process.

Abstract: Using recombinant yeast assay, cell proliferation assay and uterotropic assay, the estrogenic effect of Changjiang River raw water, effluent water from conventional process (flocculation + sedimentation + sand filter), effluent water from enhanced conventional process (flocculation + sedimentation + biological enhanced activity filter), and effluent water from biological activated carbon process (flocculation + sedimentation + sand filter + biological activated carbon filter) are analyzed. The results of in vitro test showed that when water sample at dosage of 0.01 to 2.43 L/plate, the curve of estrogen effect in Changjiang River raw water, effluent water from conventional process and enhanced conventional process was similar with that of 17β-estradiol. Their estrogen effect increased with increasing of water sample volume in certain extent, which had the dose-response relationship, and there is no estrogen effect in the effluent water from biological activated carbon process within the test’s dosage range. The results of in vivo test showed that comparing with the control group at dosage of 1 to 125 L/kg, Changjiang River raw water, effluent water from conventional process and enhanced conventional process could increase the weight of rat uterus, which indicated that the organic matters in the water samples still had estrogenic effect after the metabolic transformation in body. This study demonstrates that recombinant yeast assay, cell proliferation assay and uterotropic assay can be used for assessment of safety of effluents water from different drinking water treatment process.

Abstract: In this paper, catalytic degradation of simulated methyl blue in wastewater was investigated using hematite as heterogeneous catalyst in like-Fenton reaction. Through single factor experiments, the effects of the H2O2 dosage, the hematite dosage, initial pH value and reaction time on methyl blue catalytic degradation were studied. The results showed that as the amount of hematite, H2O2 dosage and reaction time increases, the degradation increases, more than a certain degradation value , the trend decreases and tends to stabilize. The optimal operating conditions determined by orthogonal experiments are as following: hematite dosage was 3g/L, H2O2 dosage was 3mL/L, and 4h at pH=9.The Fenton reaction system of hematite as heterogeneous catalyst has a wide range of pH, in the range of 3 to 11 have better removal effect, and generally more than 85%.