水解酸化SBR工艺处理污泥的研究

为了提高污泥水解酸化产酸率,采用SBR工艺处理污水厂污泥,研究了不同水力停留时间时间隔排泥天数(决定生物固体停留时间)对污泥水解酸化过程的影响。结果表明,在HRT 6.6d和HRT 3d时,污泥产酸率随着排泥间隔天数的增加而增加。排泥间隔天数2d时达最大,分别为135.62mg/g、125.61mg/g;排泥间隔天数3d时,污泥产酸率稍有下降。HRT 4.4d,污泥产酸率随着排泥间隔天数的增加而增加。排泥间隔天数3d时,污泥产酸率达57.88mg/g。所以,最优工况为HRT6.6d、排泥间隔天数2d的运行方式。

Research on sludge hydrolysis acidification in sequencing batch reactor process

In order to solve difficult problem of low acid yield of sludge hydrolysis acidification, a new method of using sequen- cing batch reactor process to treat sludge is proposed. Different ways of discharging sludge, which determines the biological solids retention time, are studied under different hydraulic retention time （HRT）. The results shows that sludge acid yield increases with the interval days of discharging sludge increases under the conditions of 20 ℃ of temperature. Providing 3 d and 6.6 d of HRT, 15 g/L of feed VS, 6 of pH, sludge acid yield reaches the maximum, 203.41 mgVFA/gVS, 125.61 mgVFA/gVS at 2 of interval days of discharging sludge respectively. Sludge acid yield decreases slightly at 3 of interval days of discharging sludge. Sludge acid yield increases with the interval days of discharging sludge increasing under 4.4 d of HRT. Sludge acid yield reaches the maximum, 57.88 mgVFA/gVS at 3 of interval days of discharging sludge. Optimum conditions of sludge hydrolysis acidification in sequencing batch reactor process is 6.6 d of FIRT, 2 of interval days of discharging sludge.