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1 材料与方法
1.1 初沉污泥
Table 1 Properties of primary sludge
总化学需氧量(TCOD)/(mg·L−1) | 总氮(TN)/(mg·L−1) | 总磷(TP)/(mg·L−1) | 污泥浓度(MLSS)/(g·L−1) | 挥发性污泥浓度(MLVSS)/(g·L−1) | 溶解性化学需氧量(SCOD)/(mg·L−1) | 氨氮(NH4+-N)/(mg·L−1) | 磷酸盐(PO43−-P)/(mg·L−1) |
37 200±500 | 1 534.4±299.7 | 338.2±149.7 | 46.1±5.2 | 22.0±5.3 | 1 470±300 | 176.1±40.3 | 25.3±10.2 |
1.2 实验装置及过程
1.3 分析方法
2 结果与讨论
2.1 不同碱剂混合比对厌氧发酵的影响
2.1.1 不同碱剂混合比对发酵液中SCOD溶出的影响
Fig. 1 Effect of different alkali agent volume ratios on SCOD dissolution

2.1.2 不同碱剂混合比对污泥产酸性能的影响
Fig. 2 Effect of different alkali agent volume ratios on TVFA dissolution

Table 2 Effect of different alkali agent volume ratios on composition of volatile acids in fermented broth
NaOH与Ca(OH)2比例 | 乙酸/% | 丙酸/% | 异丁酸/% | 丁酸/% | 异戊酸/% | 戊酸/% |
4:0 | 50.49 | 17.26 | 6.89 | 10.76 | 11.10 | 3.51 |
3:1 | 51.61 | 16.76 | 6.95 | 10.26 | 10.73 | 3.68 |
2:2 | 51.85 | 15.07 | 6.72 | 11.79 | 11.09 | 3.48 |
1:3 | 52.35 | 14.93 | 6.50 | 10.62 | 11.81 | 3.78 |
0:4 | 49.69 | 14.37 | 6.33 | 14.11 | 11.81 | 3.70 |
对照组 | 46.11 | 23.49 | 4.66 | 12.94 | 8.06 | 4.74 |
2.1.3 不同碱剂混合比对发酵液中PO43−-P溶出的影响
Fig. 3 Effect of different alkali agent volume ratios on PO43−-P concentration
Fig. 3 Effect of different alkali agent volume ratios on PO43−-P concentration

2.1.4 不同碱剂混合比对发酵液中NH4+-N溶出的影响
Fig. 4 Effect of different alkali agent volume ratios on NH4+-N concentration
Fig. 4 Effect of different alkali agent volume ratios on NH4+-N concentration

2.1.5 不同碱剂混合比对污泥脱水性能的影响
Fig. 5 Effect of different alkali agent volume ratios on CST and Zeta potential
Fig. 5 Effect of different alkali agent volume ratios on CST and Zeta potential

2.2 沸石对污泥碱性发酵的影响
Table 3 Effect of different zeolite dosages on fermented broth characteristics and sludge dewatering performance
沸石投加量/ (g·L−1) | SCOD/ (mg·L−1) | TVFA/ (mg·L−1) | NH4+-N/ (mg·L−1) | PO43−-P/ (mg·L−1) | CST/ s |
0 | 6 240 | 2 989.0 | 516.2 | 2.7 | 378.2 |
20 | 6 240 | 2 914.9 | 364.9 | 3.9 | 301.4 |
40 | 5 840 | 2 867.0 | 222.9 | 4.3 | 290.8 |
80 | 4 960 | 2 898.1 | 106.1 | 3.1 | 273.9 |
160 | 4 740 | 2 781.2 | 67.0 | 3.5 | 266.1 |