A pilot-scale hybrid process of ozone and biological aerated filters( BAF) with the capacity of 36 ~ 120 t / d was applied for advanced treatment of the secondary biologically effluent from a dyeing and tannery park wastewater treatment plant. Ozone pretreatment was optimized,then the effect of pollutants removal perform-ance with ozone and different medias BAF was investigated. The results showed that the best treatment efficiency and economical conditions were ozone dosage of 25 mg / L,three dosing points of 6 ∶ 3 ∶ 1 and contact time of 42 min; the effluent COD and color of ozone-biological activated carbon( O 3-BAC) were stabled at 50 mg / L and 5 times under the best conditions. The effluent met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant( GB18918-2002). The effluent of ozone-composite BAF just met the first level B criteria specified,but neither COD nor color in the effluent of ozone-ceramist BAF can meet the first level B criteria specified.

A pilot-scale hybrid process of ozone and biological aerated filters (BAF) with the capacity of 36 t x d(-1) was applied for advanced treatment of the secondary biologically effluent from a dyeing and tannery park wastewater treatment plant. The pollutants removal performance along the height of different medias BAFs were investigated. The results showed that the average COD and color were 55.4 mg x L(-1) and 12.6 times at the height of 1500 mm in activated carbon BAF, and were 55.6 mg x L(-1) and 9.4 times at the height of 1 800 mm in composite BAF, both of the effluent at each height met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Along the height of ceramist BAF, the COD and color were seldom removed. In activated carbon BAF and composite BAF, COD and ammonia nitrogen were both greatly decreased at the height of 1 200 mm, then decreased slowly. The biomasses simultaneously reached the maximum at the height of 900 mm in activated carbon, composite and ceramist BAF, with the maxims of 30.69, 28.87 and 15.94 nmol x g(-1), respectively.

The combined process of ozone and biological aerated filter(BAF) was used to treat secondary biologically treated effluent from a tannery park wastewater treatment plant.The running performances of BAFs with different media were investigated during the biofilm growth period.The pollutants removal performance and mechanisms of BAFs with different media at ozone dosage of 25 mg/L were explored.Three BAFs operating in parallel were filled with activated carbon,ceramsite and mixture of activated carbon and ceramsite with 1 ∶ 1 volume ratio.The COD removal rates of BAF with activated carbon and BAF with the mixture first decreased,then increased and finally stabilized during the biofilm growth period.After 32 d,the effluent COD was below 60 mg/L in both reactors.The COD removal efficiency of the ceramsite BAF was not significant.During the steady state operation of the activated carbon BAF,the average COD and color were decreased from 117 mg/L and 112.5 times in the influent to 50 mg/L and 6 times in the effluent,which met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).In the same period,biomasses in the activated carbon,mixture and ceramsite BAFs were 30.69 nmol/g,25.87 nmol/g and 15.18 nmol/g respectively.

Innovative ability is one of the important qualities,which is the essential to industry personnel.Due to the inflexible teaching system and the lack of practice courses in the current high education,students' innovative consciousness and potential are not fully developed.Facing this situation,we reestablished the teaching mode by creating a good teaching atmosphere,respecting students' individual differences,and adjusting the inflexible examination.Meanwhile,to strengthen practice,we built a school-enterprise cooperation platform and held science competitions.Teaching mode reform and engineering practice can stimulate students' innovation emotions,arouse their innovation consciousness,and develop their innovation potential.Therefore,the goal of developing students innovative ability will be achieved.

The effluent from a tannery wastewater biotreatment plant was treated by the ozone oxidation-activated carbon biofilter process.Under the conditions of ozone dosage 25 mg/L,oxidation time 25 min and biofilter HRT 1 h,the average COD,TOC,UV254(absorbance at 254 nm with 1 cm of optical path) and mass concentration of ammonia nitrogen in the treated wastewater are 51 mg/L,15.1 mg/L,0.12 and 0.51 mg/L,respectively.The treated wastewater quality can meet the B level in the first grade of National Discharge Standards for Municipal Wastewater Treatment Plant(GB18918-2002).

Phase change materials were prepared by the paraffin wax as phase change materials and expanded perlite as adsorption carrier in this paper. Phase change mortar was prepared by part of the sand been replaced. The heat ability which adjusts and stores heat in the heating and cooling process with different phase change materials was researched and its mechanical properties were tested and evaluated.

A hybrid process of acidification-CASS was applied for the treatment of tannery park wastewater.The results showed that the average COD and ammonia nitrogen decreased from 607 mg·L-1 and 50.7 mg·L-1 in raw water to 70 mg·L-1 and 5 mg·L-1 in treated effluent with the average removal rates as high as 88.5% and 90.1%.The effluent quality met the first grade in the national wastewater integrated standard(GB 8978-1996).

Ferric-carbon microelectrolysis treatment processes were applied for advanced treatment of biologically treated effluent of tannery wastewater in an industrial park.Priority of impact factors and their optimal conditions were studied with an orthogonal experiment and a single impact factor experiment.The results show that the priority of impact factors for ferric-carbon microelectrolysis treatment processes is Fe/C ratio>reaction time>pH.The self-made ferric-carbon(Fe/C=3/1)and the purchased ferric-carbon granule products decrease the average CODCr from 116 mg/L to 45 mg/L and 50 mg/L,respectively,under the condition of 1.5 h of reaction duration and pH 5.Treated water both meet the B level in first grade of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918—2002).Running cost for self-made ferric-carbon is 0.28 yuan/t.

A pilot-scale hybrid process of ozone/biological activated carbon(O3/BAC) with a capacity of 36 m3/d was applied for advanced treatment of secondary biological effluent from a dyeing and tannery park wastewater treatment plant.The pollutant removal performance was investigated at different ozone dosages,and the removal mechanism was discussed.The results showed that the optimal removal efficiencies of COD,color,TOC and UV254 were reached using ozone dosage of 25 mg/L,with the removal rates of 17.4%,54.3%,14.7% and 47.5%,respectively.During biofilm growth period,COD removal rate first decreased,then increased and finally stabilized at 50% after 32 d.When the BAC filter reached a stable period,the average COD and color were decreased from 100 mg/L and 112.5 times in the influent to 50 mg/L and 5 times in the effluent,and the wastewater quality met the first level B criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).The micromolecular organics degraded from macromolecular organics by ozone were absorbed and oxidized by BAC,meanwhile,some extracellular polymeric substances and metabolites were produced.The proportions of TOC and UV254 were increased from 60.7% and 58.8% in the influent to 66.8% and 65.7% in the effluent at the molecular weight of less than 1 ku.

This article discusses the teaching system and teaching contents of the reform of Fundamentals of Materials Science. The article focuses on improving teaching efficiency. Teaching manner should be ex- plained by teachers, then be combined through teachers and students＇ discussion. The precise teaching con- tent should be stressed, class designing should be optimized, and multimedia technology should be made full use in order to strengthen students＇ understanding on difficult theory and abstract concept. Then the ar- ticle illustrates that teachers should pay special attention to the skillful application of humanities and allu- sions, metaphor, analogy manner during teaching process. Teachers should also regulate students＇ assess- ment method,pay close attention to multi-factor assessment strategy and strengthen the complementary im- provement of subject construction and humanities. Lastly, the article stresses that teachers should strive for cultivating students＇ divergent thinking ability, self-acquiring knowledge ability and the creative ability.

Fenton oxidation was applied for advanced treatment of bio-treated tannery wastewater.The results showed: the influential factors of Fenton oxidation process,from weak to strong,were H2O2 dosage,Fe2+ concentration,pH,and reaction time in order.When the influent mean CODCr concentration was 116.6 mg/L,under the optimized operation condition of H2O2 dosage 50 mmol/L,Fe2+ dosage 10 mmol/L,pH 3,and reaction time 60 minutes,the mean CODCr in effluent was 31.7 mg/L,while under the operation condition of H2O2 dosage 25 mmol/L,Fe2+ dosage 7.5 mmol/L,pH 5,and reaction time 40 minutes,the mean CODCr in effluent was 46.6 mg/L.In economical operation condition with optimized operation cost ratio,the operation cost could be saved by 2.3 Yuan/m3.

Mechanical properties of geopolymer concrete under early stage curing system were studied. The results showed that at the early stage of curing time, compressive strength was improved significantly with the increasing of curing temperature and curing time. The compressive strength decreased and was close to that of standard curing condition at the age of 28d as the curing age increased. In addition, prolonging the storage time at room temperature before the step of high temperature curing could increase the long-term strength.

Fundamental studies on geopolymer are increased rapidly because of its potential commercial applications. However, little work has been done on the relationship of the interfacial transitional zone between geopolymer and aggregate and its influence on the final chemical and physical properties of geopolymeric products derived from waste materials. In this paper, factors that influencing the interfacial transition zone of geopolymer concrete such as the type of the aggregate and the oxide compositions of raw materials was studied. The microstructure was also observed through relative devices. The presented results show that bonding strength of geopolymer-marble interfacial transitional zone, of which the 28d bonding strength reached up to 7.9 MPa, was higher than that of geopolymer-granite. The bonding strength of geopolymer-marble/geopolymer-granite interfacial transitional zone increased and finally reached up to 7.9 MPa/4.3 MPa with the molar ratio of n(SiO2)/n(Al2O3) increased within the range of 2.6～2.9. Both geopolymer-marble and geopolymer-granite bonding strength decreased as the molar ratio of n(SiO2)/ n(Na2O) increased. The mechanical properties of interfacial transitional zone between geopolymer and stone were affected by the oxide component of the geopolymer and the type of the raw materials.