本文關(guān)鍵詞：非均相臭氧—光催化氧化高鹽含氰廢水的工藝研究　出處：《天津大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 氰根 氨氮 臭氧 活性炭 光催化 三相流反應(yīng)器 氯化鈉

【摘要】：含氰、氨氮廢水廣泛存在于制造業(yè)、采礦業(yè)和日常生活,排放到水體,會對環(huán)境安全和生物生存造成極大危害。本課題以氰化鈉-氯氣法合成三聚氯氰工藝廢水為研究模型,本著 沒有不能利用的垃圾,只有放錯(cuò)位置的資源‖的理念,提出了 三聚氯氰-廢水處理-氯堿化工‖區(qū)域經(jīng)濟(jì)耦合構(gòu)想,使含氰、氨氮的高鹽廢水經(jīng)處理后直接用于氯堿化工,氯堿工業(yè)的產(chǎn)品又可用作三聚氯氰的原料,實(shí)現(xiàn)系統(tǒng)的能量降低和廢水零排放。根據(jù)實(shí)驗(yàn)研究探討了廢棄物的原位處理法,提出氰化物與氨氮分步處理的理念,采用非均相臭氧氧化氰根、非均相光催化降解氨氮及產(chǎn)生的硝酸氮的綜合處理方法,對過程的反應(yīng)器設(shè)計(jì)、流程設(shè)計(jì)、操作參數(shù)優(yōu)化、廢水處理效果及反應(yīng)模型展開研究,主要研究成果和結(jié)論如下:采用非均相催化臭氧化對廢水中CN~-、NH_4~+進(jìn)行處理,設(shè)計(jì)了適于過程的三相流反應(yīng)器,考察了活性炭粒徑、活性炭濃度、臭氧濃度、pH值等因素對CN~-、NH_4~+的降解影響,發(fā)現(xiàn)活性炭與臭氧有明顯的協(xié)同效應(yīng),協(xié)同因子為1.36,當(dāng)活性炭用量為10g/L,pH=10,混合氣體(臭氧/氧氣)流量為3.2L/min,臭氧加入量為30mg/min,此時(shí)臭氧濃度為9.4mg/L,控制溫度30℃時(shí),氰根去除率為99.8%,處理過的水中殘余氰含量為0.3mg/L。研究了非均相光催化氧化-還原體系對廢水體系的處理效果,為了提高過程還原能力,設(shè)計(jì)了連續(xù)三相流化床光催化反應(yīng)器,以活性炭為載體,制備了負(fù)載型顆粒狀A(yù)C/TiO_2催化劑,在pH=11,紫外燈功率為12W,空床流速40mL/s,反應(yīng)溫度60℃,停留時(shí)間120min時(shí),總氮的去除率達(dá)98.02%,剩余總氮量只有0.7mg/L,優(yōu)于氯堿行業(yè)4mg/L的上限。為提高光催化速率及非均相臭氧化過程與光催化過程的相互耦合,在連續(xù)三相流化床光催化反應(yīng)器中,研究了光催化與臭氧的協(xié)同效應(yīng),協(xié)同因子為1.58,當(dāng)紫外燈功率為12W,AC/TiO_2催化劑投加量10g/L(w(TiO_2)=1.92%),臭氧流量20mg/min,pH值為11,水力停留時(shí)間50min時(shí),總氮脫除率在90%以上,殘留總氮在2.6~3.3mg/L之間。研究了非均相臭氧-光催化過程的反應(yīng)機(jī)理,明確了活性炭富集體系中的底物,為反應(yīng)過程提供場所的作用,本文的光催化臭氧化過程是AC/TiO_2吸附臭氧、臭氧直接氧化與紫外光催化臭氧產(chǎn)生·OH自由基和AC/TiO_2激發(fā)·OH自由基間接氧化、AC/TiO_2的導(dǎo)帶電子還原過氧化產(chǎn)物共同作用的結(jié)果。
[Abstract]:Wastewater containing cyanide and ammonia nitrogen is widely used in manufacturing, mining and daily life, and is discharged into water body. It will do great harm to environmental safety and biological survival. This project takes sodium cyanide-chlorine gas synthesis process wastewater as the research model, and there is no waste that can not be used. The concept of regional economic coupling of melamine cyanide-wastewater treatment and chlor-alkali chemical industry is put forward, so that the high-salt wastewater containing cyanide and ammonia nitrogen can be directly used in chlor-alkali chemical industry after treatment. The products of chlor-alkali industry can also be used as raw materials of cyanuric chloride to reduce the energy of the system and zero discharge of waste water. Based on the experimental study, the in-situ treatment method of waste materials is discussed, and the idea of treating cyanide and ammonia nitrogen step by step is put forward. The process reactor design, process design and operation parameters optimization were adopted in this paper, including heterogeneous ozone oxidation, heterogeneous photocatalytic degradation of ammonia nitrogen and nitrate nitrogen. The effect of wastewater treatment and the reaction model were studied. The main results and conclusions were as follows: heterogeneous catalytic ozonation was used to treat CNG-NH _ 4 ~ in wastewater. A three-phase flow reactor suitable for the process was designed. The effects of the particle size of activated carbon, the concentration of activated carbon and the pH value of ozone concentration on the degradation of NH _ 4N _ 4 ~ were investigated. It was found that the synergistic effect of activated carbon and ozone was 1.36. When the amount of activated carbon was 10 g / L ~ (-1) pH ~ (10), the flow rate of mixed gas (ozone / oxygen) was 3.2 L / min. The amount of ozone added is 30 mg / min, and the ozone concentration is 9.4 mg / L, and the removal rate of cyanide is 99.8% when the temperature is 30 鈩，

本文編號：1388023