Preliminary Study On Paper Deinking Sludge Fiberboard And Deodorization

Papermaking skill is one of the four great inventions in ancient China and has made a remarkable contribution. the progress of human civilization. At present, China's paper and paperboard production, the total consumption ranked second in the world. However, papermaking sludge pollution has become increasingly serious with the development of the paper industry. This study involves the use of paper mill to manufacture sludge fiberboard technology which solve the problem of dealing with a lot of sludge, recycle the waste, reduce the environmental pollution, at the same time opene up a wide range of raw material sources for the production of wood-based panels, protect the ecological environment, use wood. economically. Through study the primary property of the paper sludge, urea-formaldehyde resin (UF) and phenolic resin (PF) applied to the paper sludge fiberboard, wood fibe r-reinforced and glassfiber-reinforced paper sludge fiberboard, the preliminary deodorization study on paper sludge and fiberboard. The main research findings are summarized as follows: Using Optical Microscope, Inductively Coupled Plasma Quantometer, Elemental Analysis, Synchronization Thermal Analyzer, Scanning Electron Microscope(SEM), Fourier Transform Infrared Spectrometer (FT-IR), Gas Chromatography-Mass spectrometry(GC-MS) to study the primary property of the paper sludge:(1) The moisture content of wet sludge is 72.70%; the organic material content is 49.85%;pH Value is 6.6;fiber content of dry sludge is 34.09%; the length of most fiber(about77%)is below 0.20 mm; testing the copper ion content and so on of sludge ash; C,H,N,S element of wet sludge is 9.93%,1.44%,0.35%,0.39%.(2) Study wet sludge, heat dry sludge; freeze dry sludge by Synchronization Thermal Analyzer. Paper sludge that pyrolysis can be roughly divided into four stages,water precipitation, organic matter precipitation, minerals and decomposition of residual ash, but four stages is not completely separate.(3) Study bacterial configuration of wet sludge and dry sludge, mainly including micrococcus and bacillus. Bacterial corpse is found in dry sludge. Analyze the groups which possibly exit in sludge, mainly is -OH and so on, possibly kaolin exit.(4) The compounds and content of Ethyl acetate extract of wet sludge and dry sludge by GC-MS. Mainly n-Hexadecanoic acid and octadecanoic acid in wet sludge; n-Hexadecanoic acid and Benzenamine, 2-methoxy-N-[2-[1-(4-Bromophenyl)-5-tetrazolyl]ethenyl] in dry sludgeThe study of urea-formaldehyde resin (UF) and phenolic resin (PF) applied to the paper sludge fiberboard by orthogonal design:(1) UF applied to the 10～20 mesh powder paper sludge fiberboard, the average of MOR,MOE,IB,IBb,TS is 6.53 MPa,1.40GPa,2.21MPa,1.10 MPa,5.61% respectively. The effect order of parameters on MOR and MOE is Density, Resin content, Temperature, Time. The effect of parameters on MOR and MOE is very significant, except effect of time is significant atа=0.1 level. The effect order of parameters on IB is Density, Resin content, Temperature, Time. The effect of parameters on IB is very significant. The effect order of parameters on IBb is Density, Temperature, Resin content, Time. The effect of parameters on IBb is very significant except time. The effect order of parameters on TS is Density, Temperature, Resin content, Time. The effect of Density, Temperature, Resin content on TS is very significant, except effect of time is significant. The coefficient of determinations of multiple linear regression equations are more than 0.80, mean fitting well and they are significant level at 0.01 level,mean the factors are reasonable value.(2) UF applied to unclassfied powder paper sludge fiberboard, the average of MOR,MOE,IB,IBb,TS is 8.21 MPa,1.57GPa,2.25MPa,1.14MPa,5.54% respectively. The effect order of parameters on MOR, MOE and TS is Density, Resin content, Temperature, Time. The effect order of parameters on IB and IBb is Density, Temperature, Resin content, Time. The effect of Density, Resin content, Temperature on performances is very significant, but few effect of time on performances. The coefficient of determinations of multiple linear regression equations of MOR, MOE, IBb are more than 0.80, mean fitting well, but IB and TS fitting bad. They are significant level at 0.01 level.(3) PF applied to unclassfied powder paper sludge fiberboard, the average of MOR,MOE,IBb,TS is 6.53 MPa,1.40GPa,1.10MPa,,5.61% respectively. The effect order of parameters on MOR, MOE and IBb is Resin content, Granularity, Temperature, Time. The effect of Resin content and Granularity on MOR is very significant, but few effect of Temperature and Time. The effect of Resin content, Granularity and Temperature on MOE and IBb is very significant but few effect of Time. The effect order of parameters on TS is Resin content, Granularity, Time, Temperature. The effect of Resin content on is very significant,the effect of Granularity is significant, but few effect of Time and Temperature. The equations of MOR is fitting well, others fitting bad, but they are significant level at 0.01 level.(4) Study by TG-DSC, we find Thermal reaction between UF and dry sludge is not significant, between PF and dry sludge is not significant comparatively.Wood fiber, fiberglass fabric and fiberglass thread reinforce paper sludge fiberboard:(1) Wood fiber reinforce paper sludge fiberboard. The effect of wood fiber putted on sludge fiberboard surface is better than that of wood fiber mixed to sludge fiberboard. The effect of parameters on performances is significant. The equations is fitting well. The performances increase with the wood fiber increase. The performances meet the national standard when wood fiber occupied 50% at dividing type.(2) Fiberglass fabric reinforce paper sludge fiberboard. The performances increase with the coupling agent increase, but not significant when excess 1.0%. The performances meet the national standard when coupling agent excess 1.0%. The effect of parameters on performances is significant, and the equations is fitting bad.(3) Fiberglass thread reinforce paper sludge fiberboard. The performances increase with the coupling agent and length of fiberglass thread increase. The performances meet the national standard when coupling agent excess 1.0% and the length of fiberglass thread excess 4 cm. The effect of parameters on performances is significant, and the equations is fitting well.(4) Study on composite mechanism for fiberglass reinforce paper sludge fiberboard. The coupling agent can improve fiberglass surface polarity by FT-IR, create covalent bond between fiberglass and PF. The coupling agent can improve coarseness of fiberglass surface, because fiberglass surface can be wetted by PF, and then improve the wettiability of fiberglass surface. It is good for bonding.The preliminary deodorization study on paper Sludge and fiberboard:(1) Study the ammonia release rule and effect of deodorizer by Air quality-Determination of ammonia - Sodium Salicylat-sodium hypochlorite spectrophotometric method. The ammonia of dry sludge release increase than that of wet sludge. The effect of deodorizer order is NaClO, KMnO4, H2O2, CuSO4.(2) It is not suitable for study sulfureted hydrogen release by Water quality -Determination of sulfides-Iodometric method. Study the sulfureted hydrogen release rule and effect of deodorizer by hydrogen sulfide in air of residential areas-Methylene blue spectrophotometric method. The sulfureted hydrogen of dry sludge release increase than that of wet sludge. The effect of deodorizer order is CuSO4, NaClO, KMnO4, H2O2.(3) Study weightlessness of sludge fiberboard by active carbon adsorption. The weight decrease in 18 weeks incessancy. The weight decrease rate is significant in the former 3 weeks, and the latter decrease on an even keel, but never become zero. From NO.3 week, odor decrease obviously, but release sourness. From NO.5 week, sourness decrease. Odor of sludge fiberboard decrease, retain to NO.18 week.