博碩士論文 93336001 完整後設資料紀錄

DC 欄位 語言
DC.contributor環境工程研究所在職專班zh_TW
DC.creator蘇登福zh_TW
DC.creatorTeng-fu Suen_US
dc.date.accessioned2011-8-19T07:39:07Z
dc.date.available2011-8-19T07:39:07Z
dc.date.issued2011
dc.identifier.urihttp://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=93336001
dc.contributor.department環境工程研究所在職專班zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstract本研究分別以氧化鈣(CaO)和氯化鈣(CaCl2)兩種鈣鹽,以化學沉澱法,處理光電業含氟廢水,並探討鈣鹽劑量、pH值等操作因子,對氟離子去除效率的影響。同時,探討添加混凝劑與助凝劑,對提升去除效率的可行性。此外,本研究採集實廠含氟污泥,評估污泥的基本性質,濃縮沉降性及脫水性。 研究結果顯示,原水pH<3.9,氟離子(F-)值約94 mg/L至221 mg/L,屬於典型強酸型廢水。另外,化學沉澱法處理結果顯示, CaO劑量在Ca/F 為1.4時,氟離子的去除效率可達到77%,同樣的CaCl2劑量在Ca/F 為1.4時,但pH調整為 7至 8,氟離子去除效率可達到95%。添加混凝劑的實驗結果顯示,均可進一步提升氟離子的去除效率,但是,添加助凝劑,對於氟離子去除效率,皆無明顯影響,不過,對所生成膠羽的沉降性有很大幫助。實廠含氟污泥經由高分子調理,可明顯改善污泥的脫水性,其中以中性助凝劑為最佳,且污泥的比阻抗值(SRF)和毛細汲取時間(CST)均顯著的減少。 zh_TW
dc.description.abstractThis study investigated the effectiveness of fluoride removal from TFT-LCD fluoride-containing wastewater by chemical precipitation with CaO or CaCl2 as calcium salt. The effects of calcium dosage and pH on fluoride removal were evaluated by the laboratory jar tests. Additionally, the feasibility of enhancing fluoride removal by the aid of coagulant or polymer addition was investigated. Finally, the characteristics of fluoride containing sludge and its properties of thickening and dewatering were also evaluated based on the real samples obtained from full-scale treatment plant. The investigation results indicated that the pH of fluoride containing wastewater was less than 3.9 and the fluoride concentration was in the range of 94mg/L to 221 mg/L. The titration curve of the wastewater neutralized by NaOH revealed that the wastewater property was strong acidic. The jar test results showed that up to 77% of fluoride removal was obtained as fluoride precipitated by CaO at the dosage of Ca/F ratio was 1.4. However, using CaCl2 as precipitant at Ca/F ratio was 1.4 and pH was between 7 and 8, the fluoride removal efficiency was up to 95%. The experimental results also revealed that adding coagulant of PACl with calcium salt during chemical precipitation could further increase the removal efficiency of fluoride ion. Moreover, adding coagulant aid of polymer did not enhance the efficiency of fluoride removal, but could improve the floc formation and increased its settleability. The study also found that chemical conditioning of fluoride-containing sludge by polymer, especially nonionic polymer, could significantly improve the dewaterability of the sludge. This was verified by the reduction of SRF and CST values after sludge conditioning. en_US
DC.subject光電業含氟廢水zh_TW
DC.subject污泥脫水zh_TW
DC.subject氯化鈣zh_TW
DC.subject氧化鈣zh_TW
DC.subject化學沉澱zh_TW
DC.subjectcalcium chlorideen_US
DC.subjectcalcium oxideen_US
DC.subjectTFT-LCD fluoride-containing wastewateren_US
DC.subjectchemical precipitationen_US
DC.subjectsludge dewatering.en_US
DC.title化學沉澱法處理光電業含氟廢水之探討zh_TW
dc.language.isozh-TWzh-TW
DC.titleTreatment of TFT-LCD fluoride-containing wastewater by chemical precipitationen_US
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

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