本文選題：垃圾滲濾液RO濃水 + 混凝�。� 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)廢水排放標(biāo)準(zhǔn)的不斷提高,可以穩(wěn)定獲得高出水水質(zhì)的反滲透(RO)工藝越來越多的被應(yīng)用到垃圾滲濾液處理實(shí)際工程中。但與此同時(shí)產(chǎn)生的RO濃水是一類高有機(jī)物濃度、高色度、高鹽度且可生化性極差的有機(jī)廢水,已成為制約膜應(yīng)用的主要技術(shù)難題。因此研究開發(fā)一套高效經(jīng)濟(jì),實(shí)用可行的垃圾滲濾液RO濃水處理工藝勢(shì)在必行。本研究以廣州市李坑垃圾焚燒滲濾液RO濃水為研究對(duì)象,采用聚合硫酸鐵(PFS)混凝-Fenton-曝氣生物濾池(BAF)組合工藝對(duì)其進(jìn)行深度處理,并完成12 m3/d的中試應(yīng)用研究。混凝小試試驗(yàn)結(jié)果表明,PFS、聚合氯化鋁(PAC)和三氯化鐵(FC)三種絮凝劑均能有效去除RO濃水化學(xué)需氧量(COD)和色度,但PFS去除效果明顯優(yōu)于其他兩種混凝劑,且在反應(yīng)初始p H值為5.5,投加量為1000 mg/L獲得最佳去除效果,此時(shí)RO濃水的COD和色度去除率分別為57.1%和80.5%。聚鐵混凝后出水進(jìn)行Fenton-BAF深度處理。Fenton氧化工藝的最佳試驗(yàn)條件為:起始p H為3.92(混凝出水p H值),H2O2=80 mmol/L,n H2O2:n Fe2+=2,反應(yīng)時(shí)間60 min,分次投藥比為4:1,出水COD和色度的去除率分別為51%和92%,BOD5/COD由0.01提高至0.32。Fenton氧化出水進(jìn)入氣水比為4:1~6:1,停留時(shí)間為10~12 h的BAF,連續(xù)運(yùn)行10d后最終出水COD可穩(wěn)定低于300 mg/L,色度低于40倍。本研究對(duì)組合工藝各階段出水進(jìn)行紫外-可見光譜(UV-vis)和三維熒光光譜(EEM)分析。RO濃水經(jīng)組合工藝處理后E253/E203比值由0.497降至0.0313,說明有機(jī)物取代基經(jīng)處理后逐漸轉(zhuǎn)變?yōu)橐灾炬湠橹�。不同處理階段RO濃水可溶性難降解有機(jī)污染物(DOM)三維熒光光譜顯示,隨處理過程的進(jìn)行,類富里酸和類腐殖酸的含量逐漸下降,有機(jī)物的芳構(gòu)化程度普遍降低。中試運(yùn)行結(jié)果表明,在RO濃水日處理量12 m3/d,聚鐵投量1 kg/m3,雙氧水(27.5%)投量7.8~8 L/m3,n(H2O2)n(Fe2+)=2,BAF水力停留時(shí)間(HRT)12小時(shí)的條件下,出水COD≤300 mg/L,色度≤60倍,NH3-N≤10 mg/L。出水水質(zhì)滿足并優(yōu)于《水污染物排放限值》(DB44/26-2001)第二時(shí)段三級(jí)標(biāo)準(zhǔn)和《污水排入城市下水道水質(zhì)表》(CJ3082-1999三級(jí)標(biāo)準(zhǔn))。爐渣化學(xué)組成通過能譜分析(EDS)和X射線熒光光譜(XRF)分析,結(jié)果表明組合工藝出水可回用于爐渣冷卻。
[Abstract]:With the continuous improvement of wastewater discharge standards in China, reverse osmosis (RO) process, which can obtain high effluent quality stably, is more and more used in landfill leachate treatment projects. However, the RO concentrated water produced at the same time is a kind of organic wastewater with high organic concentration, high chroma, high salinity and poor biodegradability, which has become the main technical problem restricting the application of membrane. Therefore, it is imperative to develop a set of high efficient, economical, practical and feasible RO concentrated water treatment process for landfill leachate. In this study, the RO concentrated water from Likeng landfill incineration leachate in Guangzhou city was treated with polymeric ferric sulfate (PFS) coagulation-Fenton- aerated biological filter (BAF) combined process, and the pilot application of 12 m3 / d was completed. The results of coagulation experiment showed that PFS, PAC and FC could effectively remove COD and chroma of RO concentrated water, but the removal effect of PFS was better than the other two coagulants. When the initial pH value of the reaction was 5.5 and the dosage was 1000 mg / L, the removal rates of COD and chromaticity of RO concentrated water were 57.1% and 80.5%, respectively. The optimum conditions of Fenton-BAF advanced treatment. The COD of BOD 5 / 5 was increased from 0.01 to 0.32.Fenton oxidation effluent, the ratio of air to water was 4: 1: 6: 1, and the residence time was 10 ~ 12 h. After 10 days of continuous operation, the COD of the final effluent was stable below 300 mg / L, and the chroma was less than 40 times. UV-vis and three dimensional fluorescence spectra (EEM) were used to analyze the effluent from each stage of the combined process. The E253 / E203 ratio of the concentrated water was reduced from 0.497 to 0.0313, which indicated that the organic substituent was gradually converted to fat chain after treatment. Three-dimensional fluorescence spectra of soluble refractory organic pollutants (Dom) in RO concentrated water showed that the contents of fulvic acid and humic acid decreased gradually and the degree of aromatization of organic matter decreased with the process of treatment. The results showed that under the conditions of 12 m3 / d of RO concentration per day, 1 kg / m ~ (3) of polyiron, 7.8 L / m ~ (-3) H _ 2O _ 2 (H _ 2O _ 2) n (Fe _ 2) and 12 hours HRT, the effluent COD 鈮，

本文編號(hào)：2094952