發(fā)布時(shí)間：2018-05-19 10:48

  本文選題：污泥 + 固化�。� 參考：《北京工業(yè)大學(xué)》2015年碩士論文

【摘要】：本文針對(duì)北京市檀州污水處理廠的剩余污泥采用一種固化/穩(wěn)定化方法,可以在短期內(nèi)實(shí)現(xiàn)污泥的安全處理。同時(shí)利用其燒制污泥陶粒,在減量化、無(wú)害化的基礎(chǔ)上嘗試開(kāi)辟一條新的污泥利用途徑。研究采用安徽某廠家的固化劑MC4對(duì)脫水污泥進(jìn)行固化處理,研究發(fā)現(xiàn)隨著固化劑添加量、養(yǎng)護(hù)齡期的增加,固化塊的含水率顯著降低,養(yǎng)護(hù)7天后含水率最低至50%以下。而固化塊的pH值則普遍升高,穩(wěn)定在11左右。加入硫酸鋁可以顯著改善污泥固化體的pH值,但其對(duì)污泥脫水性能影響不大。固化作用雖然可以有效降低污泥的有機(jī)質(zhì)含量,但固化后的污泥低位熱值高于2500 kJ/kg,具有一定的燃料利用價(jià)值。養(yǎng)護(hù)7天后固化體抗壓強(qiáng)度達(dá)到395.8 KPa,能夠滿足《城鎮(zhèn)污水處理廠污泥處置——混合填埋用泥質(zhì)》(GB/T 23485-2009)的標(biāo)準(zhǔn)。利用掃描電鏡對(duì)固化體的表面形貌觀察后發(fā)現(xiàn)固化劑的添加使固化塊顆粒密實(shí)性提高,骨架作用提高了固化塊的力學(xué)性能,并有利于防止重金屬浸出。研究采用水泥和MgO為主要骨架,以膨潤(rùn)土、三乙醇胺、硫酸鋁作為添加劑對(duì)檀州污水處理廠剩余污泥進(jìn)行自主固化試驗(yàn)。結(jié)果表明,隨著水泥和MgO摻入量的增加,固化體的增容比和力學(xué)強(qiáng)度大幅提高,單獨(dú)摻入MgO的固化體強(qiáng)度顯著提高,增容比保持在1.5以下,遠(yuǎn)遠(yuǎn)小于水泥固化體的增容比。當(dāng)水泥和MgO協(xié)同作用時(shí),可以大大降低水泥的用量,有效提高固化體的力學(xué)強(qiáng)度的同時(shí)減少固化體占地面積,使得污泥處理處置成本下降。研究通過(guò)污泥陶粒原料配比試驗(yàn),優(yōu)選出污泥燒制陶粒的最佳方案為污泥35%,白土30%,爐渣25%,玻璃粉10%。并確定了制備污泥陶粒的最優(yōu)工藝參數(shù)為預(yù)熱溫度450℃,預(yù)熱時(shí)間15 min,燒結(jié)溫度1125℃,燒結(jié)時(shí)間30 min。在最優(yōu)燒制條件下進(jìn)行陶�？箟簭�(qiáng)度最高達(dá)到4.2 MPa,1 h吸水率14.4%,表觀密度1.46 g/cm3,堆積密度0.39 g/cm3。試驗(yàn)通過(guò)考察工藝參數(shù)及污泥摻入量對(duì)污泥陶粒性能的影響,揭示了污泥制備燒脹陶粒的作用機(jī)理。利用SEM分析陶粒表面形貌及內(nèi)部氣孔結(jié)構(gòu)表明:燒結(jié)溫度過(guò)高,使陶粒表面氣孔多且互為聯(lián)通,導(dǎo)致陶粒結(jié)構(gòu)松散,陶粒吸水率變高;污泥摻入量增加,陶粒表面氣孔較少且不能形成玻璃相包裹在陶粒表面,導(dǎo)致陶粒吸水率增加,抗壓強(qiáng)度降低。
[Abstract]:In this paper, a solidification / stabilization method is adopted for the excess sludge of Danzhou sewage treatment Plant in Beijing, which can realize the safe treatment of sludge in a short period of time. At the same time, it was used to produce sludge ceramsite, and a new way of sludge utilization was tried on the basis of reduction and innocuity. The curing treatment of dewatered sludge was carried out by using the curing agent MC4 from a certain factory in Anhui province. It was found that the moisture content of the solidified sludge decreased significantly with the increase of curing age and the water content of the solidified sludge decreased significantly after 7 days of curing. The moisture content of the solidified sludge decreased to less than 50% after 7 days of curing. However, the pH value of the solidified block generally increased and stabilized at about 11. The pH value of sludge solidified sludge was significantly improved by adding aluminum sulfate, but it had little effect on sludge dewatering performance. Although the solidification effect can effectively reduce the organic matter content of sludge, the low calorific value of the solidified sludge is higher than 2500 kJ / kg, which has certain value of fuel utilization. After 7 days of curing, the compressive strength of the solidified body reaches 395.8 KPA, which can meet the standard of sludge disposal for municipal wastewater treatment plant-mixed landfill mud > GBT / 23485-2009). Scanning electron microscope (SEM) was used to observe the surface morphology of the solidified body. It was found that the addition of curing agent improved the compactness of solidified block, the skeleton effect improved the mechanical properties of the solidified block, and was beneficial to the prevention of heavy metal leaching. Cement and MgO were used as the main framework, bentonite, triethanolamine and aluminum sulfate were used as additives to self-solidify the excess sludge of Danzhou sewage treatment plant. The results show that with the increase of cement and MgO content, the compatibilization ratio and mechanical strength of solidified body increase greatly, and the strength of solidified body with MgO alone increases significantly, and the compatibilization ratio is kept below 1.5, which is far less than the compatibilization ratio of cement solidified body. When the cement and MgO act together, the amount of cement can be greatly reduced, and the mechanical strength of the solidified body can be improved and the area of the solidified body can be reduced, which will reduce the cost of sludge treatment and disposal. According to the experiment of raw material proportion of sludge ceramsite, the optimum scheme of sludge sintering is as follows: sludge 35, clay 30, slag 25, glass powder 10. The optimum process parameters for the preparation of sludge ceramsite were determined as follows: preheating temperature 450 鈩，

本文編號(hào)：1909809