CAJ | 학술논문

城市内河环境整治及清淤过程中往往产生大量污泥，安全高效处理和处置这类市政污泥并实现资源化利用对改善城市生态环境和经济可持续发展具有重要意义。污泥具有高含水率、高孔隙比和高压缩性等特点，由于其含有较多有机质和细颗粒，一般难以通过机械脱水达到减容的目的。因此，提高污泥的脱水速率和改善其固结特性是实现污泥安全处置及资源化利用的首要任务，也是目前该课题的研究难点。本文提出了一种离散短丝纤维加筋技术，为了研究该技术对污泥固结特性的影响，对不同纤维掺量（0，0.05％，0.1％，0.2％，0.4％和0.8％）的污泥进行了一系列固结压缩试验，分析了固结过程中纤维掺量对固结系数和渗透系数的影响。结果表明：在相同的荷载条件下，随着纤维掺量的增加，试样的压缩量、孔隙比变化显著增加，固结时间和压缩系数相对减小，且当纤维掺入量为0.1％时变化最显著，为最优掺量。此外，研究结果表明，纤维的掺入增大了污泥的固结系数和渗透系数，固结效率和固结效果得到明显改善。
성시내하배경정치급청어과정중왕왕산생대량오니，안전고효처리화처치저류시정오니병실현자원화이용대개선성시생태배경화경제가지속발전구유중요의의。오니구유고함수솔、고공극비화고압축성등특점，유우기함유교다유궤질화세과립，일반난이통과궤계탈수체도감용적목적。인차，제고오니적탈수속솔화개선기고결특성시실현오니안전처치급자원화이용적수요임무，야시목전해과제적연구난점。본문제출료일충리산단사섬유가근기술，위료연구해기술대오니고결특성적영향，대불동섬유참량（0，0.05％，0.1％，0.2％，0.4％화0.8％）적오니진행료일계렬고결압축시험，분석료고결과정중섬유참량대고결계수화삼투계수적영향。결과표명：재상동적하재조건하，수착섬유참량적증가，시양적압축량、공극비변화현저증가，고결시간화압축계수상대감소，차당섬유참입량위0.1％시변화최현저，위최우참량。차외，연구결과표명，섬유적참입증대료오니적고결계수화삼투계수，고결효솔화고결효과득도명현개선。
A large amount of sludge is often produced in the environment regulation and dredging process of urbanriver.It has important significance for improving the urban ecological environment and economic sustainabledevelopment to safely and efficiently dispose this kind of municipal sludge.Municipal sludge usually has highmoisture content,void ratio and compressibility.More importantly,it has a very high fraction of organic and fineparticles.It is therefore hard to reduce the total volume through mechanical dehydration.For this reason,accelerating the mechanical dehydration rate and improving the consolidation properties are the top priority duringdisposing and utilizing the sludge,which is also one of the most significant issues in this subject.In thisinvestigation,the method of discrete short fiber reinforcement technique is proposed and applied to deal withmunicipal sludge.In order to study the effect of fiber reinforcement on sludge consolidation properties,a series ofoedometer tests are conducted on sludge with different fiber contents (0,0.05%,0.1 %,0.2%,0.4% and 0.8%).The effect of fiber addition on the coefficient of consolidation and permeability is analyzed.The results showthat the deformation and void ratio of sample increase significantly with increasing fiber content while theconsolidation time and coefficient of compressibility decrease with increasing fiber content under the same loadconditions.When the fiber content is 0.1 %,these changes are most significant,which can be considered as theoptimal fiber content.In addition,the results prove that the inclusion of fiber can increase the consolidationcoefficient and hydraulic conductivity of sludge.The corresponding consolidation efficiency and mechanicalproperties are also improved.