Advanced Materials Research Vols. 374-377

Abstract: In our study, a new kind of material for toluene adsorption was prepared by melt blending with EPDM as the matrix and waste dusty slag as the filler. The effects of dicumylperoxide (DCP) and waste dusty slag contents on the toluene absorbency were studied. The results show that the toluene absorbency reaches the highest value 388.11 % for the composite with 2 wt % DCP and 30 wt % waste dusty slag. Comparing the toluene absorbency for three samples, the experimental result indicates that the toluene absorbency of waste dusty slag /EPDM composite was higher than that of EPDM (crosslinked) and EPDM

Abstract: In this paper the experiment research of fluoride removal was based on coagulating sedimentation method, and the defluorination effect of coagulant’s kinds and dosage、parameters of rotational speed and coagulant aid’s dosage was studied and optimized, which could provide crafts parameters of efficient-whirling clarifier for engineering application . In this experiment, five coagulants was compared, which including aluminum sulfate (Al2(SO4)3)、potassium alum(KAl(SO4)2)、ferric sulphate（Fe2(SO4)3）、ferric chloride（FeCl3）and polyaluminium chloride（PAC）. Parameters of rotational speed applied in this experiment were simulated from the G state of efficient-whirling clarifier, while polyacrylamide was employed as the coagulant aid. The experiment results showed that: First, the defluorination effect of polyaluminium chloride was better than that of other coagulants. Second, the optimum parameters of rotational speed was that mixing at the speed of 400 r/min for 60 seconds，the first stage of coagulation at the speed of 160r/min for 7minutes、the second stage of coagulation at the speed of 90r/min for 8 minutes and sedimentation for 15minutes. Third, PAM was helpful for the defluorination effect of PAC. The fourth, when fluoride concentration in raw water respectively were 2.0mg/L、5.0mg/L、10mg/L, the dosages of PAC respectively were 400 mg/L、500mg/L、1300mg/L and the dosage of PAM respectively were that of PAM was 0.09mg/L、0.12mg/L、0.09mg/L, which could make the outlet of fluoride concentration achieved the national drinking water standard (GB5749-2006).

Abstract: Experiment was made，in which Harbin reservoir water was taken as source water to observe the influence of chlorination conditions such as chlorine dosage，reaction time，pH value，organics concentration and varieties of disinfectant on the amount of trihaloacetic acids formation．Based on the experiment results，control measures were proposed for the formation of disinfection byproducts such as trihaloacetic acids through optimizat ion of disinfection．

Abstract: A visible-light-active nitrogen-doped mesoporous TiO₂ (N-TiO₂) film was synthesized via sol-gel spin-coating technique, using carbon spheres as pore-forming materials. The as-prepared film was characterized by XRD, BET, SEM, XPS and UV-Vis. The N-TiO₂ film showed higher photocatalytic activity in the degradation of dye Reactive Brilliant Red X-3B (C.I. reactive red 2) under visible light irradiation compared with smooth TiO₂ film and P25 film. The apparent rate constant of the N-TiO₂ film was almost 10 times as that of P25 film.

Abstract: This paper test to processing lakes sediment by three kinds of in-situ control technology which including aeration, zeolite capping and calcium nitrate in situ treatments, and it study the influence of phosphorus release from sediment. The test results showed: (1) under anaerobic conditions, the phosphorus release content is as 4.26 times as it under aerobic conditions. Under aerobic condition (dissolved oxygen saturation ≥ 20%), the Dissolved oxygen is not important for phosphorus release in sediments.（2）zeolite capping can effectively control the phosphorus release from sediment, but Dissolved oxygen is important for that. Under dynamic condition, the phosphorus release content is stability.（3）Under aerobic conditions or anaerobic conditions, calcium nitrate in situ treatments can effectively control the phosphorus release from sediment. Under aerobic conditions, the phosphorus release content reduce by 53.6%.Under anaerobic conditions, it reduce by 83.4%.(4) The control effects of the phosphorus release content by three kinds of in-situ control technology was followed: under anaerobic condition, calcium nitrate in-situ treatment > zeolite capping> untreated; and under aerobic condition, calcium nitrate in-situ treatment > zeolite capping > aeration ≥ untreated; and under hydrodynamic condition, calcium nitrate in-situ treatment >zeolite coverage>zeolite capping> aeration >untreated.

Abstract: The operating characteristics of IC reactor were studied when wastewater of sweet potato starch was utilized to domesticate the granular sludge. The effect of temperature on the treatment of sweet potato starch wastewater using IC reactor was specially researched. Results showed that the COD removal rate improved gradually in the process of the granular sludge in the IC reactor was domesticated by wastewater of sweet potato starch, and the activity of granular sludge also increasingly recovered. When the domestication was finished, the volume loading rate and the COD removal rate could attain 21.9kgCOD/ (m3 •d) and 84%, respectively. When the system temperature was between 29～35°C,the COD removal rate could be above 80%. However, when the temperature decreased, the COD removal rate reduced sharply.

Abstract: Based on the shear performance of existing reinforced concrete beam oblique section and referring to the slipping theory of bending crack of the beam, a formula of the diagonal crack width is proposed through the equilibrium condition, the geometric condition and the concrete failure criteria. This formula has explicitly and clearly the physical concept.So,it can be used to check the maximum diagonal crack width of RC beam in the design.

Abstract: The sewage is used for startup and stable operation of the test, Startup in simultaneous nitrification-denitrification of Denitrification Bioreactor and Influence of Temperature and DO for Treatment was studied in the test. The results showed that, When the temperature was 30 degree Celsius, DO was 0.3-0.5mg/L，pH was 8 and reflux ratio was 300%, the removal rate of COD,ammonia nitrogen and total nitrogen reached stability after domestication of 58 days, and the quality of effluent achieved the A national standard. There is small influence of temperature for COD removal and large influence of temperature for ammonia nitrogen removal. Biological nitrogen removal process was not fit to operate in low temperature, and the suitable temperature was from 20 degree Celsius to35 degree Celsius. With DO increasing, the removal rates of COD and NH4+-N was increasing and then kept in a constant value. When DO was 0.4 mg/L, the removal rate of TN reached the maximum and it was 75.86%

Abstract: ZnO crystals with different morphologies were successfully prepared via a simple solution route at low temperature. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-Vis diffuse reflectance spectra (UV-Vis DRS) were used to characterize the products. Photocatalysis of the as-prepared ZnO crystals was evaluated by degradation of methyl orange in an aqueous solution exposed to ultraviolet light. Results suggested a close relationship between the photocatalytic activity and the particle morphology and size.

Abstract: Using Xinxue River Constructed Wetland as the study object, the wetland prediction models based on BP neural network were established through the seasonal division of the wetland, and the maximum influent water load was determined on the constraint condition that effluent water quality achieved class Ⅲ of surface water quality. Then nonlinear functions of water quality and quantity scheduling were constructed by Origin software. The optimal influent load was determined adopting prediction results of the models as constraint conditions of the functions. Thus the water quality and quantity scheduling scheme of the wetland was established. The results show that optimal influent load for Feb. ~ May: the influent water quantity is no more than 8560m3/d, CODCr is 25.47mg/l~26.37mg/l, ammonia nitrogen 0.11mg/l~1.0mg/l, TN 10.28mg/l~10.51mg/l, TP 0.16mg/l; for Jun. ~ Sept.: the water quantity is no more than 31750m3/d, CODCr is 26mg/l~32.36mg/l, or 37.15mg/l~45.37mg/l, ammonia nitrogen 0.48 mg/l~1.78mg/l, TN 5.15mg/l~6.18mg/l, TP 0.07mg/l~0.09mg/l; for Oct. ~ Dec.: the water quantity is no more than 11070m3/d, CODCr is 24.55mg/l~26.91mg/l, ammonia nitrogen no more than 0.75, TN no more than 8.61 mg/l, TP 0.10mg/l~0.12mg/l, or 0.16mg/l~0.17mg/l.