哈尔滨工业大学学报
哈爾濱工業大學學報
합이빈공업대학학보
JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY
2015年
4期
1-8
,共8页
剩余污泥%冻融%冷冻温度%有机物%胞外聚合物
剩餘汙泥%凍融%冷凍溫度%有機物%胞外聚閤物
잉여오니%동융%냉동온도%유궤물%포외취합물
sewage sludge%freeze/thaw%freezing temperature%organic matter%extracellular biological organic matter(EBOM)
为了明确冷冻温度对冻融处理剩余污泥时有机物变化的影响，寻求最佳的冻融处理方式，考查了－20、－10以及－5℃条件下冷冻，再于20℃融化后污泥中有机物质量浓度的变化，并通过红外光谱分析冻融污泥中有机物组分的变化。结果表明，冻融后的污泥内固体物质溶出主要发生在未完全冷冻阶段，延长冷冻时间，固体破解程度趋于稳定。完全冷冻即进入固化阶段（－20℃时2?5 h；－10℃时3～4 h；－5℃时4～6 h）的污泥，污泥絮体网状结构被破坏；融化后，污泥胞内有机物大量溶出。在－5／20℃条件下冻／融，污泥上清液中亲水性有机物（ hydrophilic fraction， HPI）组分所占比例增加到59?3％，并可较彻底地破解污泥胞外有机物（ extracellular biological organic matter， EBOM）疏水性组分中的蛋白质，同时烃类及糖类化合物吸收峰在处理后显著增加。相对－20／20℃条件下冻／融，－5／20℃下冻／融可以更好地释放污泥胞内有机物并改善污泥的可生化性。为了获得更好的冻融效果，可在－5℃的条件下进行冷冻，当污泥完全冷冻后（即冷冻4～6 h）再将污泥转入相对较低的冷冻温度条件下进行后续的固化，最后在室温条件下融化。
為瞭明確冷凍溫度對凍融處理剩餘汙泥時有機物變化的影響，尋求最佳的凍融處理方式，攷查瞭－20、－10以及－5℃條件下冷凍，再于20℃融化後汙泥中有機物質量濃度的變化，併通過紅外光譜分析凍融汙泥中有機物組分的變化。結果錶明，凍融後的汙泥內固體物質溶齣主要髮生在未完全冷凍階段，延長冷凍時間，固體破解程度趨于穩定。完全冷凍即進入固化階段（－20℃時2?5 h；－10℃時3～4 h；－5℃時4～6 h）的汙泥，汙泥絮體網狀結構被破壞；融化後，汙泥胞內有機物大量溶齣。在－5／20℃條件下凍／融，汙泥上清液中親水性有機物（ hydrophilic fraction， HPI）組分所佔比例增加到59?3％，併可較徹底地破解汙泥胞外有機物（ extracellular biological organic matter， EBOM）疏水性組分中的蛋白質，同時烴類及糖類化閤物吸收峰在處理後顯著增加。相對－20／20℃條件下凍／融，－5／20℃下凍／融可以更好地釋放汙泥胞內有機物併改善汙泥的可生化性。為瞭穫得更好的凍融效果，可在－5℃的條件下進行冷凍，噹汙泥完全冷凍後（即冷凍4～6 h）再將汙泥轉入相對較低的冷凍溫度條件下進行後續的固化，最後在室溫條件下融化。
위료명학냉동온도대동융처리잉여오니시유궤물변화적영향，심구최가적동융처리방식，고사료－20、－10이급－5℃조건하냉동，재우20℃융화후오니중유궤물질량농도적변화，병통과홍외광보분석동융오니중유궤물조분적변화。결과표명，동융후적오니내고체물질용출주요발생재미완전냉동계단，연장냉동시간，고체파해정도추우은정。완전냉동즉진입고화계단（－20℃시2?5 h；－10℃시3～4 h；－5℃시4～6 h）적오니，오니서체망상결구피파배；융화후，오니포내유궤물대량용출。재－5／20℃조건하동／융，오니상청액중친수성유궤물（ hydrophilic fraction， HPI）조분소점비례증가도59?3％，병가교철저지파해오니포외유궤물（ extracellular biological organic matter， EBOM）소수성조분중적단백질，동시경류급당류화합물흡수봉재처리후현저증가。상대－20／20℃조건하동／융，－5／20℃하동／융가이경호지석방오니포내유궤물병개선오니적가생화성。위료획득경호적동융효과，가재－5℃적조건하진행냉동，당오니완전냉동후（즉냉동4～6 h）재장오니전입상대교저적냉동온도조건하진행후속적고화，최후재실온조건하융화。
To research the effect of freezing temperature on organic matter transformation during freeze/thaw treatment of excess sludge, and to seek the best way of freeze/thaw process, the organic matter transformation during excess sludge disintegration, frozen at -20, -10 and -5 ℃ and thawed at room temperature (20 ℃), respectively, were investigated. The characteristics of organic matter changes of freeze/thaw sludge were also examined using infrared spectrum analysis. The results indicated that the dissolution of solid matter in sludge mainly occurred in the freezing stage, reaching stable after prolonged freezing time. The floc matrix structure was disrupted for the completely frozen sludge (-20℃, after 2?5 h;-10℃, after 3-4 h and-5℃, after 4-6 h), and organic matter sharply released after thawing for 12 h. Under the condition of -5/20 ℃ ( freeze/thaw) treatment, the proportion of hydrophilic fraction ( HPI ) component was increased to 59?3% and the proteins of hydrophobic components in extracellular biological organic matter ( EBOM ) were disintegrated thoroughly. In addition, hydrocarbon and carbohydrate absorption peak were increased under -5℃ freezing. Compared with the -20/20℃(freeze/thaw) treatment, the intracellular organic matter could be released more thoroughly and the sludge biodegradability was improved via -5/20 ℃ ( freeze/thaw) treatment. To obtain the better performance of freeze/thaw treatment, sludge could be firstly frozen at-5℃. When sludge was frozen completely (frozen 4-6 h), it could be transferred into the lower freezing temperature for subsequent curing and finally thawed at room temperature.
