【摘要】：本文采用有機(jī)絮凝劑陽(yáng)離子聚丙烯酰胺(CPAM)和無(wú)機(jī)絮凝劑聚合硫酸鐵(PFS)為代表,采用污泥比阻(SRF)為主要指標(biāo),同時(shí)考察上清液濁度、污泥沉降比、含水率和脫水率等為輔助指標(biāo)研究?jī)羲勰嗝撍堋Ｍㄟ^(guò)加入硝酸鈰(Ce(NO_3)_3)改變污泥性質(zhì),探討其對(duì)污泥脫水性能影響。通過(guò)對(duì)凈水污泥進(jìn)行EDX、XRD、SEM、FIRT等表征,研究其脫水機(jī)理。研究結(jié)果如下:(1)選用CPAM作為絮凝劑,探究混凝工藝參數(shù),CPAM投加量為70mg/L,污泥絮凝脫水實(shí)驗(yàn)攪拌參數(shù)為轉(zhuǎn)速200r/min、時(shí)間120s時(shí),污泥比阻為0.53*10~9·S~2/g,對(duì)比阻的去除率達(dá)到80.22%,污泥沉降比降至68%,濁度由21.4NTU降至10.87NTU,含水率降至81.7%,脫水率增至81.4%。(2)CPAM的絮凝效果較好。在1000 m L污泥中,當(dāng)CPAM投加量為80 mg/L候,污泥比阻降至0.48*10~9·S~2/g,比阻去除率達(dá)到82.0%,脫水效能最佳。PFS投加量在600 mg/L時(shí)達(dá)到最佳,污泥比阻降至0.45*10~9·S~2/g,比阻去除率達(dá)到83.2%。(3)表征分析:改性后凈水污泥特征衍射峰較尖銳,說(shuō)明改性后的污泥中SiO_2、Al_2O_3、Fe_2O_3的結(jié)晶度越好。(4)溫度和pH對(duì)改性污泥比阻有一定的影響,當(dāng)溫度為30℃時(shí),污泥比阻為0.42*10~9·S~2/g,比阻去除率達(dá)到84.33%。在最佳溫度(30℃)控制下,pH為7,污泥比阻為0.39*10~9·S~2/g,比阻去除率達(dá)到85.45%,污泥脫水效能較高。(5)改性絮凝法調(diào)質(zhì)與單獨(dú)使用絮凝劑調(diào)質(zhì)相比較,污泥比阻去除率提高10%,含水率降低了7%左右。
[Abstract]:In this paper, the organic flocculant cationic polyacrylamide (CPAM) and inorganic flocculant polyferric sulfate (PFS) were used as the representative, the sludge specific resistance (SRF) was used as the main index, the turbidity of the supernatant and the sludge sedimentation ratio were also investigated. Water content and dewatering rate were used as auxiliary indexes to study the dewatering efficiency of water purification sludge. The effects of cerium nitrate (Ce (NO_3) 3) on sludge dewatering were studied. The dewatering mechanism of purified sludge was studied by EDX,XRD,SEM,FIRT. The results are as follows: (1) using CPAM as flocculant, the coagulation process parameters are investigated. The dosage of CPAM is 70 mg / L, and the stirring parameter of sludge flocculation dewatering experiment is 200rmin, 120s. The specific resistance of sludge is 0.53 ~ 109S ~ (2 / g), the removal rate of contrast resistance is 80.22, the sludge settling ratio is down to 68, the turbidity is reduced from 21.4NTU to 10.87 NTU, the water content is reduced to 81.7 and the dehydration rate is increased to 81.4. (2) the flocculation effect of CPAM is better. In 1000 mL sludge, when the dosage of CPAM is 80 mg/L, the specific resistance of sludge is reduced to 0.48 ~ 109SU / g, the specific resistance removal rate reaches 82.0, and the dehydration efficiency is the best. When the dosage of PFS is 600 mg/L, the sludge specific resistance is the best. The specific resistance of the modified sludge was reduced to 0.45 ~ 109S ~ (2 / g), and the specific resistance removal rate was 83.2%. (3) characterization analysis: the characteristic diffraction peak of the modified sludge was sharp, which indicated that the crystallinity of SiO_2,Al_2O_3,Fe_2O_3 in the modified sludge was better. (4) temperature and pH had a certain effect on the specific resistance of the modified sludge. When the temperature is 30 鈩，

本文編號(hào)：2270198