采用热重分析法研究掺混比和升温速率对市政污泥和油茶壳混燃特性的影响,使用FlynnWall-Ozawa(FWO)和Kissinger-Akahira-Sunose(KAS)2种方法对样品的燃烧动力学进行建模,计算了各类样品的稳燃性指数和综合燃烧特性指数,分析了燃烧过程...采用热重分析法研究掺混比和升温速率对市政污泥和油茶壳混燃特性的影响,使用FlynnWall-Ozawa(FWO)和Kissinger-Akahira-Sunose(KAS)2种方法对样品的燃烧动力学进行建模,计算了各类样品的稳燃性指数和综合燃烧特性指数,分析了燃烧过程中混合燃料成分间的交互作用。结果表明:污泥掺混油茶壳后,混合燃料的燃尽温度明显降低,燃烧稳定性能和综合燃烧特性有明显改善;随着油茶壳掺混质量比从20%升至80%,燃尽温度从590℃下降到532℃,燃尽程度也逐渐变大,失质量由63.13%增加到92.19%,稳燃性指数和综合燃烧特性指数分别增加1.66和2.32倍;随着升温速率的增加,混合样品的燃尽温度、稳燃性指数和综合燃烧特性指数均提高,而燃尽程度变小,且着火温度无明显变化;污泥与油茶壳混合燃烧各组分间发生了交互现象,在挥发分燃烧阶段表现为抑制作用,而固定碳燃烧阶段表现为促进作用;FWO法和KAS法计算污泥的平均表观活化能分别为122.32、118.08 k J/mol,油茶壳的平均表观活化能分别为166.46、164.94 k J/mol,混合样品的平均表观活化能随着油茶壳掺混质量比的增加而增大。展开更多
磷在生物体尤其是农作物生长中起到了重要作用,而磷资源在当下呈现短缺的状态,从市政污泥中回收磷也就成为了未来污水处理的必然之路。污泥中的磷含量在1%~3%左右,主要以正磷酸离子等无机磷形式存在,回收磷具有可行性。回收的原理主要...磷在生物体尤其是农作物生长中起到了重要作用,而磷资源在当下呈现短缺的状态,从市政污泥中回收磷也就成为了未来污水处理的必然之路。污泥中的磷含量在1%~3%左右,主要以正磷酸离子等无机磷形式存在,回收磷具有可行性。回收的原理主要是加入钙、镁等离子进行沉淀回收。目前,现有投入使用的污泥磷回收技术可以分为在溶液中沉淀的湿化学反应法和加热沉淀的热处理法,二者分别存在回收率低和成本、耗能高的问题。未来磷回收将结合“双碳”战略目标,走向节能减排之路,可行的发展方向包括浓缩污泥回收、结合生物处理以及源分离技术,它们都可以降低能耗、减少成本并提高回收率。Phosphorus plays an important role in the growth of organisms, especially crops, and phosphorus resources are in a state of shortage at present. Recovering phosphorus from municipal sludge has become an inevitable way for future sewage treatment. Phosphorus content in sludge is about 1%~3%, which mainly exists in the form of inorganic phosphorus such as orthophosphate ion, so it is feasible to recover phosphorus. The main principle of recovery is to add calcium and magnesium plasma for precipitation recovery. At present, the existing sludge phosphorus recovery technology can be divided into wet chemical reaction method of precipitation in solution and heat treatment method of heated precipitation, which have the problems of low recovery rate and high cost and energy consumption respectively. In the future, phosphorus recycling will be combined with the “Carbon peaking and carbon neutrality” strategic goals and move towards the road of energy conservation and emission reduction. Possible development directions include concentrated sludge recovery, combined biological treatment and source separation technologies, all of which can reduce energy consumption, reduce costs and increase recovery efficiencies.展开更多
文摘采用热重分析法研究掺混比和升温速率对市政污泥和油茶壳混燃特性的影响,使用FlynnWall-Ozawa(FWO)和Kissinger-Akahira-Sunose(KAS)2种方法对样品的燃烧动力学进行建模,计算了各类样品的稳燃性指数和综合燃烧特性指数,分析了燃烧过程中混合燃料成分间的交互作用。结果表明:污泥掺混油茶壳后,混合燃料的燃尽温度明显降低,燃烧稳定性能和综合燃烧特性有明显改善;随着油茶壳掺混质量比从20%升至80%,燃尽温度从590℃下降到532℃,燃尽程度也逐渐变大,失质量由63.13%增加到92.19%,稳燃性指数和综合燃烧特性指数分别增加1.66和2.32倍;随着升温速率的增加,混合样品的燃尽温度、稳燃性指数和综合燃烧特性指数均提高,而燃尽程度变小,且着火温度无明显变化;污泥与油茶壳混合燃烧各组分间发生了交互现象,在挥发分燃烧阶段表现为抑制作用,而固定碳燃烧阶段表现为促进作用;FWO法和KAS法计算污泥的平均表观活化能分别为122.32、118.08 k J/mol,油茶壳的平均表观活化能分别为166.46、164.94 k J/mol,混合样品的平均表观活化能随着油茶壳掺混质量比的增加而增大。
文摘磷在生物体尤其是农作物生长中起到了重要作用,而磷资源在当下呈现短缺的状态,从市政污泥中回收磷也就成为了未来污水处理的必然之路。污泥中的磷含量在1%~3%左右,主要以正磷酸离子等无机磷形式存在,回收磷具有可行性。回收的原理主要是加入钙、镁等离子进行沉淀回收。目前,现有投入使用的污泥磷回收技术可以分为在溶液中沉淀的湿化学反应法和加热沉淀的热处理法,二者分别存在回收率低和成本、耗能高的问题。未来磷回收将结合“双碳”战略目标,走向节能减排之路,可行的发展方向包括浓缩污泥回收、结合生物处理以及源分离技术,它们都可以降低能耗、减少成本并提高回收率。Phosphorus plays an important role in the growth of organisms, especially crops, and phosphorus resources are in a state of shortage at present. Recovering phosphorus from municipal sludge has become an inevitable way for future sewage treatment. Phosphorus content in sludge is about 1%~3%, which mainly exists in the form of inorganic phosphorus such as orthophosphate ion, so it is feasible to recover phosphorus. The main principle of recovery is to add calcium and magnesium plasma for precipitation recovery. At present, the existing sludge phosphorus recovery technology can be divided into wet chemical reaction method of precipitation in solution and heat treatment method of heated precipitation, which have the problems of low recovery rate and high cost and energy consumption respectively. In the future, phosphorus recycling will be combined with the “Carbon peaking and carbon neutrality” strategic goals and move towards the road of energy conservation and emission reduction. Possible development directions include concentrated sludge recovery, combined biological treatment and source separation technologies, all of which can reduce energy consumption, reduce costs and increase recovery efficiencies.
