本文選題：改性膨潤土 + 改性硅藻土�。� 參考：《鄭州大學》2015年碩士論文

【摘要】：水體中的磷是生物生長的必需元素,但磷的含量過高易引起水體富營養(yǎng)化,因此控制水體中磷的含量至關重要。利用礦物類粘土的特殊結(jié)構(gòu)對磷進行吸附研究是一種新興的處理技術,其具有除磷效果好、操作簡單、運營成本低等特點,雖然我國的礦物類粘土資源豐富,但在實踐工程方面還處于探索階段,在深度處理方面的應用更少,故需要進一步的深入研究,為該方法在實際工程中的應用提供技術支持。本文分別研究了膨潤土和硅藻土的改性條件及影響因素,利用掃描電鏡(SEM)、X射線衍射分析(XRD)等技術手段表征了改性前后二者的微觀結(jié)構(gòu)和形態(tài),并通過大量燒杯實驗考察了其除磷效果。將二者復配后,用于模擬廢水中磷的去除研究,投加到機械攪拌澄清池中對模擬二沉池出水進行深度處理,探索其最佳運行工況,為二沉池出水的深度處理及低濃度含磷廢水的處理提供了一些參考。主要結(jié)論如下:1.膨潤土原土的投加量為500mg/L時,除磷率為8%左右,除磷效果不理想;采用鹽酸質(zhì)量分數(shù)為5%,焙燒溫度為400℃時,除磷效果較好。通過大量的靜態(tài)燒杯試驗,結(jié)果表明在改性膨潤土的投加量為500mg/L、p H值為6~7、溫度為25℃左右、混合反應時間為15min、沉淀時間為30min,此時改性膨潤土的除磷率維持在50%左右。2.硅藻土原土的投加量為700mg/L時,除磷率為6%左右,除磷效果不理想;采用鹽酸質(zhì)量分數(shù)為10%,焙燒溫度為400℃時,除磷效果較好。通過大量的靜態(tài)燒杯試驗,結(jié)果表明在改性硅藻土的投加量為700mg/L、p H值為6~7、溫度為25℃左右、混合反應時間為15min、沉淀時間為30min,此時改性硅藻土的除磷率維持在48%左右。3.將改性后的膨潤土和硅藻土按照一定的質(zhì)量比例進行復配,通過大量靜態(tài)燒杯試驗,結(jié)果表明:在復配土的投加量為500mg/L,二者復配比例為60%:40%時,除磷效果較為理想,除磷率維持在76%左右。將復配后的改性土投加到機械攪拌澄清池中,深度處理并聯(lián)多級A/O二沉池出水,試驗結(jié)果表明:在投加量為500mg/L,機械攪拌轉(zhuǎn)速為25r/min,停留時間為2h時為最佳工況,此時總磷的去除率達到82%,出水中總磷濃度低于0.5mg/L,達到了國家一級A類的污水排放標準。4.根據(jù)大量文獻研究和市場調(diào)研,對復配土深度處理二沉池出水進行了技術經(jīng)濟分析,結(jié)果表明,復配土深度除磷具有高效、經(jīng)濟的特點,在理論和經(jīng)濟上是可行的。
[Abstract]:Phosphorus in water is an essential element for biological growth, but high phosphorus content can easily lead to eutrophication, so it is very important to control the phosphorus content in water. It is a new technology to study phosphorus adsorption by using the special structure of mineral clay. It has the characteristics of good phosphorus removal effect, simple operation and low operating cost, although the mineral clay resources are abundant in China. But the practical engineering is still in the exploration stage and the application in the advanced processing is even less, so it needs further research to provide technical support for the application of the method in the practical engineering. The modification conditions and influencing factors of bentonite and diatomite were studied in this paper. The microstructure and morphology of bentonite and diatomite before and after modification were characterized by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effect of phosphorus removal was investigated by a large number of beaker experiments. The mixture of the two is used to study the removal of phosphorus in simulated wastewater, and the effluent of the simulated secondary sedimentation tank is treated deeply by adding it to the mechanically stirred clarifier, and the optimal operating conditions are explored. Some references are provided for the advanced treatment of secondary sedimentation tank effluent and the treatment of low concentration phosphorous wastewater. The main conclusions are as follows: 1. When the dosage of raw bentonite is 500 mg / L, the phosphorus removal rate is about 8%, and the phosphorus removal effect is better when the mass fraction of hydrochloric acid is 5 and the calcination temperature is 400 鈩，

本文編號：2030247