Fe^(2+)/S_2O_8^(2-)体系对污泥的破解性能的研究

Studies of Distinguish Performance of Sludge by Fe^(2+)/S_2O_8^(2-) System

以城市污水处理厂的储泥池高浓度的污泥作为研究对象,用Fe2+活化过硫酸钠(PDS)产生具有强氧化性的硫酸根自由基对污泥进行氧化破解。分别探讨同反应时间、初始p H、C(Fe2+)/C(S2O2-8)、PDS投加量以及不同的反应温度对污泥破解能力的影响。结果表明:当C(PDS)=15 mmol/L、C(Fe2+)/C(S2O2-8)=0.3、T=35℃、p H=3的较优条件下反应8 h,污泥比阻(SRF)从1.65e+11降到4.6e+10,溶解性COD(SCOD)从85 mg/L升高到550 mg/L。随着p H的增加,提高C(Fe2+)/C(S2O2-8)度均使污泥破解效果逐渐减弱,而升高温度有利于污泥破解。

The oxidative disintegration of sludge in wastewater treatment plant as main target by strong oxidizing sulfate radicals generated from sodium peroxydisulfate （ PDS） activated by Fe2＋ was studied. The effects of initial time, initial solution pH, mol ratio of Fe2＋and PDS C（ Fe2＋）/C（ PDS） , PDS dosage and reaction temperature were investigated. The results showed the sludge specific resistance decreased from 1. 65 e＋11 to 4. 6 e＋10 and soluble chemical oxygen demand （ SCOD） increased from 85 mg/L to 550 mg/L in 8 h under typical condition：C（ PDS）=15 mmol/L, C（ Fe2＋）/C（PDS）=0. 3, pH=3 and 35 ℃. The sludge disintegration effect decreased with the increasing pH and C（Fe2＋）/C（ PDS）. Moreover, increasing reaction temperature would promote sludge distinguish.