本文關(guān)鍵詞：脫硫灰改善污泥脫水性能的機理及用于水泥摻料的研究　出處：《北京科技大學》2017年博士論文　論文類型：學位論文

  更多相關(guān)文章： 脫硫灰 污水污泥 脫水機理 脫水性能 水泥摻料

【摘要】：城市污水處理副產(chǎn)物——污泥,含有大量水分,如何經(jīng)濟、高效的實現(xiàn)泥水分離,是降低污水處理成本的瓶頸,也是實現(xiàn)污泥減量化和資源化的關(guān)鍵。半干法煙氣脫硫副產(chǎn)物——脫硫灰,對工業(yè)生產(chǎn)和環(huán)境安全日益構(gòu)成威脅,如何有效的處理和處置,已成為現(xiàn)實難題。本研究從"以廢治廢"的理念出發(fā),將脫硫灰的利用與污泥脫水性能的改善緊密結(jié)合起來,以脫硫灰調(diào)理污泥的機理研究為基礎(chǔ),優(yōu)化調(diào)理方案。試圖用脫硫灰代替常規(guī)污泥調(diào)理劑,降低污泥脫水成本,提高污泥脫水性能。將調(diào)理后的脫水污泥摻入水泥生料,開拓脫硫灰和污泥的資源化利用途徑。通過混凝脫水試驗,以污泥沉降高度、濾餅含水率(Wc)、污泥比阻(SRF)和毛細吸水時間(CST)為評價指標,比較了脫硫灰、FeCl_3、O_3和電解單獨及聯(lián)合調(diào)理對污泥脫水性能的影響;通過測定污泥各層胞外聚合物(EPS)含量、溶解性化學需氧量(SCOD)、Zeta電位變化和傅里葉變換紅外光譜分析(FTIR),提出了脫硫灰調(diào)理污泥的機理;通過水泥生料易燒性試驗,水泥膠砂強度試驗,氯離子含量測試,浸出毒性試驗等,獲得了調(diào)理脫水污泥在水泥中的摻入量及其影響。主要結(jié)論如下:研究改善污泥的脫水性能,應(yīng)從提高污泥脫水速度和脫水程度兩個方面著手。脫硫灰的架橋作用為自由水的濾出提供通道,其吸附性能使進入污泥上清液的部分EPS又返回固相表面,減少溶解性有機物,有利于提高脫水速度;脫硫灰、O_3或電解都能剝離污泥中緊密粘附性EPS、破壞細胞和絮體結(jié)構(gòu),使之部分被轉(zhuǎn)化為溶解性EPS和松散粘附性EPS,并使其中一部分EPS進一步水解成羧酸、羧酸鹽等小分子有機物,釋放其中的表面吸附水和內(nèi)部結(jié)合水,有利于提高脫水程度;脫硫灰中CaO的電性中和作用,能改變污泥顆粒表面特性,壓縮雙電層,增強絮體的凝聚,提高污泥的顆粒密度,釋放顆粒表面的吸附水,既有利于提高脫水速度,又有利于提高脫水程度;緊密粘附性EPS是影響污泥脫水性能的主要因素。脫硫灰調(diào)理污泥對改善污泥的脫水性能有重要作用。脫硫灰調(diào)理污泥的最佳混凝攪拌條件為:先以350r/min的速度混合攪拌30s,再以50r/min的速度絮凝攪拌15 min;投加425 mg/g脫硫灰,可使Wc降至79.34%,SRF、CST和Wc分別降低76.43%、60.5%和14.65%。投加脫硫灰不超過干基污泥質(zhì)量的50%,能使難脫水污泥(SRF=1012～1013cm/g)轉(zhuǎn)變?yōu)橹械入y脫水污泥(SRF=(0.5～0.9)× 1 012 cm/g);脫硫灰與FeCl_3、O_3或電解聯(lián)合調(diào)理污泥,好于脫硫灰單獨調(diào)理的效果。投加300 mg/g脫硫灰和60 mg/g FeCl_3,使Wc降至72.68%,CST和Wc分別降低 97.7%和 13.16%;通入 O_3 85.72 mg/g,投加 400 mg/g 脫硫灰和 60 mg/g FeCl_3,使Wc降至 70.70%,CST和Wc分別降低 83.5%和 15.41%;采用 Ti/RuO_2電極、4cm極間距、20V電壓、0.100mol/L NaCl濃度、電解40min,投加300 mg/g脫硫灰和60 mg/g FeCl_3,使Wc降至70.50%,CST和Wc分別降低91.4%和 15.76%。將調(diào)理脫水污泥用于水泥摻料具有可行性,試驗獲得調(diào)理脫水污泥的最佳摻入量為7.5%。驗證了在此摻量下,熟料試樣中硅酸三鈣的結(jié)晶度顯著提高,并出現(xiàn)大量的中間相,水泥熟料的煅燒性能得到提高;污泥對水泥強度無明顯影響,水化物中出現(xiàn)了更多的鈣礬石晶體,能得到正常的水化產(chǎn)物;熟料中的氯離子和重金屬元素含量均遠低于國家標準的限定值。本研究為脫硫灰和污泥的減量化、穩(wěn)定化、無害化和資源化探索了一條途徑。為利用脫硫灰改善污泥脫水性能提供理論依據(jù),為污水處理廠降低污泥脫水成本提供有益借鑒。
[Abstract]:City sewage treatment byproduct sludge contains large amounts of water, how to achieve economic, efficient separation of the mud, the bottleneck is to reduce the cost of sewage treatment, it is also the key to sludge reduction and recycling. Semi dry flue gas desulfurization by-product of desulfurization ash, increasing threat to industrial production and environmental safety, handling and disposal effectively, has become a real problem. This research is from "bywaste" concept, will use the desulfurization ash and the sludge dewatering performance improvement of the combination mechanism of desulfurization ash sludge conditioning research based optimization scheme. Try to use conditioning desulphurization ash instead of conventional sludge conditioner, reduce sludge dewatering cost, improve sludge dewatering performance. After conditioning the sludge from the cement raw material, resource utilization and development of desulfurization ash sludge. Through flocculation dewatering experiments with high sludge sedimentation Degree of moisture content of filter cake (Wc), sludge specific resistance (SRF) and capillary suction time (CST) as the evaluation index, the desulfurization ash, FeCl_3, O_3 and electrolysis alone and in combination with conditioning effect on sludge dewatering performance of sludge; through the determination of each layer of extracellular polymeric substances (EPS) content, soluble chemical oxygen demand (SCOD), Zeta analysis of potential changes and Fu Liye transform infrared spectroscopy (FTIR), the mechanism of desulfurization ash sludge conditioning is put forward; the burnability of cement raw materials test, cement mortar strength test, the test content of chlorine ion, leaching toxicity test, the incorporation of dewatered sludge in cement and its influence the main conclusions are as follows: improve the sludge dewatering performance of two aspects, should improve the dewatering velocity and degree of hands. Bridging desulfurization ash free water filter provides a channel, the adsorption performance of the EPS into the sludge supernatant Returned to the solid surface, reducing the dissolved organic matter, is conducive to improve the speed of dehydration; desulfurization ash, O_3 or electrolysis can peel sludge close adhesion EPS, damage cells and floc structure, which was partially transformed into soluble EPS and loosely adherent EPS, and made a part of the EPS further hydrolysis a carboxylic acid, carboxylic acid salt and other small organic molecules adsorbed on the surface of the water and the internal release of bound water, is conducive to improve the degree of dehydration; desulphurization ash CaO electrical neutralization, can change the surface properties of granular sludge, the compression of electric double layer, enhance the floc, improve the particle density of sludge, adsorption and release the water surface of the particle, which is conducive to the improvement of dehydration speed, and improve the degree of dehydration; close adhesion of EPS are the main factors that influence the performance of sludge dewatering. The desulfurization ash sludge conditioning plays an important role in improving the dewatering performance of sludge ash desulfurization. Sludge conditioning the best mixing condition of coagulation are as follows: first, with the speed of 350r/min mixing with 30s, 50r/min 15 min speed flocculation stirring; adding 425 mg/g desulfurization ash, can make the Wc to 79.34%, SRF, CST and Wc were decreased by 76.43%, 60.5% and 14.65%. adding desulfurization ash not more than dry sludge quality 50%, can lead to dehydration of sludge (SRF=1012 ~ 1013cm/g) into medium hard sludge (SRF= (0.5 ~ 0.9) * 1012 cm/g); desulfurization ash and FeCl_3, O_3 or electrolytic sludge conditioning, to separate desulfurization ash conditioning effect. The dosage of 300 mg/g and 60 mg/g FeCl_3 desulfurization ash, the Wc to 72.68%, CST and Wc were decreased by 97.7% and 13.16%; in O_3 85.72 mg/g, adding 400 mg/g and 60 mg/g FeCl_3 desulfurization ash, the Wc fell to 70.70%, CST and Wc were decreased by 83.5% and 15.41%; the Ti/RuO_2 electrode, 4cm electrode spacing, 20V voltage, 0.100mol/L concentration of NaCl, electrolysis 40min , the dosage of 300 mg/g and 60 mg/g FeCl_3 desulfurization ash, the Wc fell to 70.50%, CST and Wc were decreased by 91.4% and 15.76%. will be used for cement admixture sludge conditioning and dewatering test is feasible, the best mixed sludge conditioning with 7.5%. verified this dosage, crystallization in samples of calcium silicate clinker three degrees increased significantly, and the emergence of a large number of intermediate phase, the burning performance of cement clinker is improved; sludge has no obvious effect on the strength of cement, the ettringite crystal more hydration, hydration products can be normal; chloride and heavy metals content in clinker are far below the national standard limit value in this research. For the desulfurization ash and sludge reduction, stabilization, harmless and resources to explore a way to provide a theoretical basis for utilization of desulfurization ash to improve sludge dewatering performance, to reduce cost of sewage treatment plant sludge dewatering Provide useful reference.

【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：X703

【參考文獻】

相關(guān)期刊論文 前10條

1 李斌斌;范海宏;馬增;武亞磊;;水泥熟料對污泥中重金屬的固化特性[J];硅酸鹽通報;2016年06期

2 王淑瑩;何岳蘭;李夕耀;賈方旭;郭思宇;;不同活性污泥胞外聚合物提取方法優(yōu)化[J];北京工業(yè)大學學報;2016年04期

3 宋秀蘭;石杰;吳麗雅;;過硫酸鹽氧化法對污泥脫水性能的影響[J];環(huán)境工程學報;2015年11期

4 張冬;董岳;黃瑛;張棟;姚一思;;國內(nèi)外污泥處理處置技術(shù)研究與應(yīng)用現(xiàn)狀[J];環(huán)境工程;2015年S1期

5 丁紹蘭;曹凱;董凌霄;;石灰調(diào)理對污泥脫水性能的影響[J];陜西科技大學學報(自然科學版);2015年04期

6 劉強;陳曉歡;傅金祥;張曉強;;粉煤灰與生石灰復(fù)合調(diào)理劑對市政污泥深度脫水性能的影響[J];環(huán)境工程學報;2015年07期

7 姜玲玲;孫蓀;;我國污泥處理處置現(xiàn)狀及發(fā)展趨勢分析[J];環(huán)境衛(wèi)生工程;2015年03期

8 王學魁;趙斌;張愛群;沙作良;;城市污水處理廠污泥處置的現(xiàn)狀及研究進展[J];天津科技大學學報;2015年04期

9 劉進強;劉姚君;汪瀾;;干法脫硫灰在建材領(lǐng)域資源化利用的研究進展[J];硅酸鹽通報;2015年04期

10 李輝;吳曉芙;蔣龍波;梁婕;李昌珠;袁興中;肖智華;郭晶晶;;城市污泥脫水干化技術(shù)進展[J];環(huán)境工程;2014年11期

，

本文編號：1355910