本文選題：污泥 + 水熱預處理　； 參考：《青島科技大學》2017年碩士論文

【摘要】：城市污泥是一種非常復雜的非均質(zhì)膠團,如果不進行合理處置,不僅會對環(huán)境造成嚴重的污染,同時會造成資源浪費。厭氧消化是國內(nèi)應(yīng)用較多的一種污泥處理技術(shù)。而傳統(tǒng)厭氧消化技術(shù)停留時間長,厭氧速率及產(chǎn)氣效率低,限制了該技術(shù)的發(fā)展。水熱預處理技術(shù)可以破壞污泥細胞結(jié)構(gòu),促進污泥中有機質(zhì)溶出從而可以有效的提高污泥厭氧消化速率,提高厭氧產(chǎn)氣率。本研究中,利用水熱技術(shù)對污泥進行預處理,考察了水熱過程中污泥固液比、水熱時間及溫度對污泥中碳氮磷溶出的影響,然后進行厭氧消化,根據(jù)累積產(chǎn)氣量確定了最佳的水熱預處理條件,同時探究了厭氧消化對污泥中碳氮磷溶出的影響,通過研究污泥中氮磷資源的回收及污泥預處理后固液相分別產(chǎn)氣,優(yōu)化了污泥厭氧產(chǎn)氣條件,最終確定了整套污泥資源化處理方案。主要實驗結(jié)果如下:(1)水熱預處理可以促進污泥中碳氮磷的溶出,VFAs、COD和總氮的溶出率隨著污泥固液比的增大而增大,而氨氮的溶出率逐漸降低,固液比10%時,污泥總磷溶出率最大為95.37%;隨著水熱時間及溫度的增加,污泥中COD及總氮的濃度逐漸增加,VFAs、總磷及磷酸根呈先增大后減小的趨勢,氨氮濃度隨水熱時間的增加先升高后降低,而隨著水熱溫度的升高逐漸升高。(2)污泥水熱后,厭氧消化效率提高,累積產(chǎn)氣量增大,隨著污泥固液比的增大,污泥累積產(chǎn)氣量逐漸下降,產(chǎn)氣效率降低;隨著預處理時間的增長,污泥累積產(chǎn)氣量及產(chǎn)氣效率降低,而隨著水熱溫度的升高,呈先升高后降低的趨勢。根據(jù)污泥厭氧產(chǎn)氣情況,選擇最佳水熱條件為污泥固液比在5%,在水熱溫度為160℃下,處理0.5h。水熱預處理后會提高污泥厭氧消化過程中VS和TS去除率,同時會提高沼氣中的甲烷含量。(3)厭氧消化后,不同預處理條件下污泥中碳磷濃度下降,氮濃度升高。固液比10%時,TCOD和SCOD降解率最大,分別為23.40和81.55%,總氮和氨氮的濃度升高最多,固液比5%時,總磷和磷酸根降低最多;水熱時間為1.0h時TCOD和SCOD降解率最大,分別為17.42%和48.43%,總氮和氨氮濃度升高最多,磷酸根和總磷分別在水熱時間為1.5h和0.5h時降低最大;水熱溫度200℃和160℃時SCOD和TCOD降解率最大,分別為60.24%和39.86%,氨氮和總氮濃度在160℃水熱溫度下提升最大,水熱溫度在200℃時,磷酸根和總磷的降低程度最大。(4)水熱預處理后回收污泥中的氮磷再進行厭氧消化,會提高污泥厭氧消化性能,同時會提高厭氧消化過程中總氮及磷酸根的溶出率,脫氮磷后污泥累積產(chǎn)氣量可提高11.25%,同時日產(chǎn)氣效率提高。污泥水熱后,將污泥進行固液分離,固液相分別進行產(chǎn)氣,會提高污泥厭氧產(chǎn)氣效率和產(chǎn)氣量,厭氧消化周期可縮短10-15天,其中液相累積產(chǎn)氣量是未進行固液分離污泥產(chǎn)氣量的1.3倍。
[Abstract]:Urban sludge is a very complex heterogeneous micelle. If it is not disposed properly, it will not only cause serious pollution to the environment, but also cause waste of resources. Anaerobic digestion is a kind of sludge treatment technology which is widely used in China. However, the development of traditional anaerobic digestion technology is limited by its long residence time, low anaerobic rate and gas production efficiency. Hydrothermal pretreatment technology can destroy the cell structure of sludge, promote the dissolution of organic matter in sludge, which can effectively improve the anaerobic digestion rate of sludge and increase the anaerobic gas production rate. In this study, the sludge was pretreated by hydrothermal technique. The effects of the ratio of solid to liquid, the time of water and heat and the temperature on the dissolution of carbon, nitrogen and phosphorus in the sludge were investigated, and then anaerobic digestion was carried out. According to the cumulative gas production, the optimum conditions of hydrothermal pretreatment were determined, and the effects of anaerobic digestion on the dissolution of carbon, nitrogen and phosphorus in sludge were investigated. The recovery of nitrogen and phosphorus resources in sludge and the production of gas in solid and liquid phase after pretreatment were studied. The anaerobic gas production conditions of sludge were optimized, and the whole treatment plan of sludge reuse was finally determined. The main results are as follows: (1) hydrothermal pretreatment can promote the dissolution of carbon, nitrogen and phosphorus in sludge, and the dissolution rate of COD and total nitrogen increases with the increase of solid / liquid ratio of sludge, but the dissolution rate of ammonia nitrogen decreases gradually, when the ratio of solid to liquid is 10, With the increase of hydrothermal time and temperature, the concentration of COD and total nitrogen in sludge increased gradually, the total phosphorus and phosphate radical increased first and then decreased, and the concentration of ammonia nitrogen increased first and then decreased with the increase of hydrothermal time. However, with the increase of hydrothermal temperature, the anaerobic digestibility and cumulative gas production increased. With the increase of the ratio of solid to liquid, the cumulative gas production of sludge decreased gradually and the efficiency of gas production decreased. With the increase of pretreatment time, the cumulative gas production and gas production efficiency of sludge decreased, but with the increase of hydrothermal temperature, the sludge increased first and then decreased. According to the condition of anaerobic gas production of sludge, the optimum water-heat condition is that the ratio of solid to liquid of sludge is 5, the temperature of water and heat is 160 鈩，

本文編號：1882727