污泥负荷与污泥容积指数的关系研究

THE RELATION BETWEEN SLUDGE LOAD AND SLUDGE VOLUME INDEX

以苏打法纸浆废水为试样,进行完全混合活性污泥室内试验。测定污泥负荷与SVI值,污泥沉降速度、处理效果及其参数。试验结果表明,污泥负荷在0.3～0.5kgBOD/kgMLSS·d和SVI值低时,其BOD去除率、污泥的凝聚性及沉降性均较佳;负荷超出此范围,SVI均较高。最适宜的范围。MLSS为5000～7000mg/l;曝气时间8小时以上。但本法对木质素去除效果很差。完全混合式活性污泥处理工艺的设计参数为,BOD去除率系数,第一槽K=0.000143(h^(-1)),第二槽K=0.000257(h^(-1)),污泥增殖系数a=0.6,自动氧化系数b=0.17。

This paper dealt with the results of shop experiment on the activated sludge treatment process of waste from soda process of paper mill. The test model was of complete-mix flow type. The aim of the experiment was to measure process parameters such as sludge load rate, SVI, sludge settling velocity and treatment efficiency. It was shown that when the sludge load rate was at the range of 0.3～0.5 kg BOD/kg MLSS·d,the SVI was at lowest value, the flocculance and settling property of sludge were good and BOD removal rate was high; while beside this range, SVI would be higher. The optimum MLSS concentration and aeration time were 5000-7000mg/l and over8h respectively. The design parameters of the complete-mix activated sludge treatment process for soda pulp waste were proposed to be as follows:coefficent of BOD_5 romoval rate 0.000143 and 0.000257h^(-1)respectively, coefficient of sludge growth rate 0.6 and coefficient of endogenous metabolism 0.17.