| 生物淋滤-PAC与PAM联合调理城市污泥 |
| 摘要点击 2373 全文点击 1490 投稿时间：2009-11-01 修订日期：2010-01-11 |
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| 中文关键词 城市污泥 生物淋滤 PAC PAM 脱水性能 |
| 英文关键词 sewage sludge bioleaching polyaluminum chloride (PAC) polyacrylamide (PAM) dewaterability |
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| 中文摘要 |
| 采用生物淋滤-聚合氯化铝(PAC)与聚丙烯酰胺(PAM)联合使用工艺对城市污泥进行了调理研究.结果表明,在固定单质硫投量为3g·L-1的条件下,投加亚铁离子能明显加快污泥生物淋滤速率;FeSO4·7H2O投量为8g·L-1时,污泥pH降至2约需1.5 d.生物淋滤显著改善了污泥的脱水性能,生物淋滤后使污泥比阻从6.45×1010 s2·g-1降到1.45×1010 s2·g-1,降低了77.52%,但污泥仍属于难脱水污泥.回调淋滤污泥pH至6,投加PAC及PAM对淋滤污泥进行强化调理.结果表明,单独使用PAC与PAM的最佳投量分别为200 mg·L-1和50 mg·L-1;联合使用PAC与PAM时,PAC与PAM的最佳投量分别为100 mg·L-1和25mg·L-1,污泥比阻和滤饼含水率分别为2.02×108 s2·g-1和74.81%,污泥属于易脱水污泥.与单独使用PAC与PAM相比,PAC与PAM联合使用调理污泥费用低、处理效果好. |
| 英文摘要 |
| Bioleaching-dual polyaluminum chloride (PAC) and polyacrylamide (PAM) addition was used to condition sewage sludge. The results showed that FeSO4·7H2O addition improved the bioleaching rate obviously with a fixed sulfur power dosage of 3g·L-1; when the FeSO4·7H2O dosage was 8g·L-1, the bioleaching lasted 1.5 d to decrease the sludge pH below 2. Bioleaching improved the sludge dewaterability significantly with a specific resistance to filtration (SRF) reduction of 77.52% from 6.45×1010 s2·g-1 to 1.45×1010 s2·g-1, but the bioleached sludge was still difficult to be dewatered. After adjusting the bioleached sludge pH to 6, PAC and PAM were used to enhance conditioning of the bioleached sludge. The results indicated that the optimal dosage was 200 mg·L-1 for PAC or 50 mg·L-1 for PAM when single chemical was used. When PAC and PAM were dually used, the optimal dosages of PAC and PAM were 100 mg·L-1 and 25mg·L-1, respectively; SRF and moisture of sludge cake reduced to 2.02×108 s2·g-1 and 74.81%, respectively, showing good dewaterability of the treated sludge. Compared with the single use of PAC and PAM, the dual use of PAC and PAM showed the advantages of lower cost and better conditioning effect. |
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