本文關鍵詞：剩余活性污泥對重金屬鉛、鎘的吸附特性研究　出處：《長安大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 活性污泥 吸附 重金屬 鉛、鎘

【摘要】：隨著我國城市的飛速發(fā)展和污水處理廠的建設,生活污水以及工業(yè)污水的處理排放很大程度上解決了水污染問題,但隨之而來的是污水處理廠處理污水所產(chǎn)生的大量的剩余活性污泥,而對剩余活性污泥的處置往往需要耗費大量的資金,若處置不當,很有可能造成二次污染,利用剩余活性污泥吸附重金屬廢水,以廢治廢,既對污泥進行了資源化利用,又提高了經(jīng)濟效益。本論文主要研究了剩余活性污泥對典型重金屬離子鉛、鎘的吸附,探討了污泥吸附鉛、鎘的影響因素,比較污泥對鉛、鎘的吸附能力差異,研究了污泥吸附鉛、鎘熱力學及動力學特性,并計算了污泥吸附鉛、鎘的熱力學參數(shù)及動力學參數(shù)。在污泥吸附重金屬的基礎上初步研究了污泥中重金屬的去除。研究發(fā)現(xiàn),剩余活性污泥對重金屬鉛、鎘的去吸附都較高,且對鉛的親和力大于鎘;吸附量受吸附時間、污泥投加量、吸附體系的初始pH值的影響較大,溫度的影響很小。鉛鎘共存吸附體系中,鉛鎘吸附相互抑制,且鉛的競爭吸附對鎘的抑制作用更強。活性污泥吸附鉛、鎘的吸附更符合Langmuir吸附模型,污泥對鉛、鎘的吸附過程都是吸熱過程,且吸附都是自發(fā)進行的,其中對鉛的吸附自發(fā)趨勢比鎘強�；钚晕勰鄬︺U、鎘的吸附動力學規(guī)律更符合用準二級動力學方程來描述。鹽酸、檸檬酸和EDTA對鉛、鎘的去除效果差異較大,檸檬酸的解吸效果最好,認為可采用檸檬酸對高重金屬含量的污泥進行解吸,來提高污泥的資源化利用率。
[Abstract]:With the rapid development of cities and the construction of sewage treatment plants in China, the treatment and discharge of domestic sewage and industrial sewage to a large extent solve the problem of water pollution. However, there is a large amount of surplus activated sludge produced by sewage treatment plant, and the disposal of surplus activated sludge often costs a lot of money. If the disposal is not proper, it may cause secondary pollution. The utilization of excess activated sludge to adsorb heavy metal waste water and treat it with waste water not only reused the sludge but also improved the economic benefit. This paper mainly studied the effect of excess activated sludge on the typical heavy metal ion lead. The adsorption of lead and cadmium by sludge was studied. The adsorption capacity of lead and cadmium by sludge was compared. The thermodynamic and kinetic characteristics of adsorption of lead and cadmium by sludge were studied and the adsorption of lead by sludge was calculated. The removal of heavy metals from sludge was studied on the basis of adsorption of heavy metals by sludge. It was found that the removal of lead and cadmium from excess activated sludge was higher than that of activated sludge. And the affinity to lead is higher than that of cadmium. The adsorption capacity was influenced by adsorption time, sludge dosage, initial pH value of adsorption system, and little effect of temperature. In the system of co-adsorption of lead and cadmium, the adsorption of lead and cadmium inhibited each other. The adsorption of lead by activated sludge is more consistent with the Langmuir adsorption model. The adsorption of lead and cadmium by sludge is an endothermic process. The adsorption of lead was more spontaneous than that of cadmium. The kinetics of adsorption of lead and cadmium in activated sludge was more consistent with the quasi-second-order kinetic equation. Hydrochloric acid. The removal efficiency of lead and cadmium by citric acid and EDTA was different, and the desorption efficiency of citric acid was the best. It was suggested that citric acid could be used to desorb sludge with high heavy metal content in order to improve the utilization ratio of sludge.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

【共引文獻】

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