SBR反应器内碳基好氧颗粒污泥的培养及其稳定运行特性

Cultivation and Stable Operation Performance of Carbon-Based Aerobic Granular Sludge in SBR

为探究粉末活性炭和钙离子的投加对污泥颗粒化进程的影响,在300 L SBR(序批式反应器)中接种普通絮状污泥,投加1.0 g/L粒径约75μm的PAC(粉末活性炭)及35 mg/L的Ca^(2+)以促进污泥颗粒化进程,并研究其稳定运行特性.结果表明:常温下反应器在14 d内开始形成具有良好沉降性能的AGS(好氧颗粒污泥),至第18天污泥颗粒化程度达到80.0%左右;在此后运行的100 d内,AGS基本能保持其结构完整性.同时,反应器内ρ(MLSS)(污泥浓度)由接种时的3 300 mg/L升至4 050 mg/L,污泥SVI(体积指数)由接种时的120 m L/g变为35 m L/g.w(PS)(PS为胞外多糖)较少且变化量小;w(PN)(PN为胞外蛋白)在反应器启动及稳定运行阶段内都在提高,最终达到240 mg/g(以每g MLVSS中含PS的质量计),PN/PS(质量比)最终稳定在15.00左右.稳定运行期间,反应器对污水中CODCr、TN、TP的平均去除率分别达到82.0%、76.5%和96.0%.研究显示,投加的PAC与普通絮状污泥间的吸附作用,促进了污泥的颗粒化进程;同时,PAC作为AGS的惰性成核物质,避免了AGS因内源呼吸从颗粒内部解体,提高了AGS的稳定性.

A new method to accelerate the granulation process by inoculating 1. 0 g/L powder activated carbon( PAC) with particle size 75μm together with 35 mg/L of Ca^(2 +)in sequencing batch reactor( SBR) was studied,as well as the pilot scale cultivation and stable operation performance of carbon-based aerobic granular sludge( AGS). The results showed that aerobic granular sludge with a good settling performance was formed within 14 days in the reactor,and the degree of sludge granulation reached 80. 0% in 18 days at normal temperature. During the stabilization phase of 100 d,AGS could mainly remain in complete forms. At the same time,the mixed liquor suspended solids( MLSS) ranged from 3300 mg/L to 4050 mg/L,and the slugged volume index( SVI) changed from 120 m L/g to 35 m L/g. In addition,polysaccharides( PS) content was low and changed little,but the proteins( PN) concentration kept improving in the cultivation period and stable operation phases,finally reaching 240 mg/g MLVSS,andthe PN/PS remained at approximately 15. 00.Meanwhile,during the whole stable operation phase,the average removal rate of chemical oxygen demand,total nitrogen and total phosphorus reached 82. 0%,76. 5% and 96. 0%,respectively. The results showed that the adsorption and shear force between ordinary flocculent sludge and PAC accelerated the granulation process; meanwhile,the PAC acted as an inner core which kept the AGS stable and prevented it from being disintegrated.