STUDY ON SCREENING AND OPTIMIZATION OF MUNICIPAL SLUDGE DEEP DEWATERING CONDITIONERS

2014 32 65 3 1 4 1. 510640 2. 100049 3. 528000 4. 550081 SRF CST - 1 PAM 30 ~ 60 mg /L - 2 PAM 9 mg /L 30 g /L 30 g /L STUDY ON SCREENING AND OPTIMIZATION OF MUNICIPAL SLUDGE DEEP DEWATERING CONDITIONERS Liu Lirong 1 2 Luo Yanqiang 1 2 Peng Lisi 1 2 Gong Lifang 1 2 Ma Yinghui 1 2 Ye Tingjin 3 Chen Fanzhong 1 Li Gang 4 1. Guangzhou institute of geochemistry Chinese Academy of Sciences Guangzhou 510640 China 2. University of Chinese Academy of Sciences Beijing 100049 China 3. Foshan Water Group Foshan 528000 China 4. Guizhou Same Net Environmental Protection Technology Company Limited Guiyang 550081 China Abstract Taking the sludge of Foshan Zheng'an sewage treatment plant as research object and using sludge settling performance specific resistance to filtration SRF capillary suction time CST water content of sludge cake and dehydration rate as indexes it was investigated the different influence between adding single flocculant and organicinorganic compound flocculant to discussed the influence of coagulant-aid such as quicklime and fly ash on sludge dehydration. The results shows 1 Under single flocculant condition the cationic polyacrylamide PAM ' dewatering effect is the best the best additive quantity is 30 ~ 60 mg /L. Under organic-inorganic compound flocculant condition sludge dewatering performance shows obvious improvment compared with single flocculant condition. 2 Under flocculant plus coagulant-aid condition sludge dewatering performance shows obvious improvement and less flocculant additive amount compared with organic-inorganic compound flocculant condition. Within the scope of experiment the best sludge conditioner combination is 9 mg /L cationic polyacrylamide PAM 30 g /L quicklime 30 g /L fly ash. Keywords dehydration of urban sludge sludge settling performance specific resistance to filtration SRF capillary suction time CST water content of sludge cake 0 1 5 6 7 2 3 4

66 2014 32 specific resistance to filtration SRF capillary suction time CST 1 1. 1 4 C 1 1 ph /% / Pa s / g ml - 1 COD / g L - 1 SS / g L - 1 7. 91 99. 59 0. 921 10-3 0. 97 10. 31 16. 5 VSS / g L - 1 / g g - 1 DS - 1 / cm g - 1 CST /s MLSS / g L - 1 SVI 7. 261 0. 316 1. 46 10 12 29. 2 19. 9 41. 21 1 PAM PAM PAM 2 Polyaluminium Chloride PAC Basic Aluminium Chloride BAC 1. 2 1. 2. 1 100 ml 100 ml 30 min SRF = 2PA b μ c ( cm /g ) 2 P A b V 0 - V t / V 0 - V μ SRF SRF 9. 18 10 11 ~ 10 12 cm /g 3. 67 10 11 cm /g 10 100 ml 1 min 35. 5 kpa V 0 5 s 1 3 5 10 15 20 30 min V 1 V V V 0 SV = V 100% V 0 1 7 ~ 8 min 1. 2. 4 W 0 W 1 105 5 h 1. 2. 2 W 2 = 1 - W 2 - W ( 0 W 1 - W ) 100% 0 3 CST s 1 cm = Q r - Q c 100% Q r 4 CST Q r g Q c g CST 2 CST 2. 1 1. 2. 3 SRF PAM

2014 32 67 PMA PAM 30 ~ 60 mg /L PMA 30 ~ 60 mg /L PAM 8 PAM PAM 0. 3% 300 r /min 30 ~ 40 s 50 r /min 5 min 1 3 PAM 9 CST SRF 2. 2-1 10 PAM SRF 8. 81 10 11 cm /g CST 9. 9 s 3 PAC BAC PAM PAC BAC PAM PAC BAC PAM PMA PAM PAC BAC 4 5 6 PAC PAM CST SRF 2 PAM CST SRF 3 PMA 1 PMA 30 mg /L 2 PMA 30 mg /L SRF 1. 99 10 11 cm / g CST 11. 9 s 60 mg /L 4 PAM PAC

68 2014 32 5 6 PAM PAC CST SRF PAM PAC 4 PAC 1 g /L PAC 0. 5 g /L 2 g /L PAC 1 g /L PAM 30 g /L PAM 5 PAC PAM CST SRT PAC 0. 5 g /L PAM 60 g /L 90 g /L PAC 1 g /L PAM 60 g /L 90 g /L CST SRF 4 5 1 g /L PAC + 60 mg /L PAM 1 g /L PAC + 90 mg /L PAM 2 g /L PAC + 90 mg /L PAM SRF CST 11 SRF CST 6 PAC 1 g /L PAM 9 g /L 60 g /L PAC 1 g /L PAM 90 g /L 86. 61% 93. 71% 2 6-2 6 - /ml SRF / cm g - 1 CST /s /% 91 1. 46 10 12 29. 2 84. 81 90 mg /L PAM + 1 g /L PAC 50 2. 59 10 10 12. 5 93. 41 9 mg /L PAM + 1 g /L BAC 55 1. 38 10 12 24. 8 90. 78 30 mg /L PAM + 3 g /L 66 3. 92 10 11 14. 8 92. 20 30 mg /L PAM + 0. 5 g /L PAC 52 3. 24 10 11 37. 3 90. 36 60 mg /L PAM + 3 g /L BAC 69 2. 35 10 11 21. 9 91. 18 90 mg /L PAM + 1 g /L 65 5. 69 10 11 13. 9 90. 52 2 90 mg /L PAM 1 g /L 4 2. 3 30 mg /L PAM 0. 5 g /L CST 37. 3 s 7 29. 2 s PMA PAC

2014 32 69 7 8 9 PAM CTS SRF 9 PAM 7 PAM 8 PAM CTS SRF 9 mg /L PAM 30 g /L 30 g /L 8 SRF 2 PAM 9 mg /L CST PAM 9 mg /L CST PAM 9 mg /L 30 g /L 30 g /L SRF 6. 08 10 9 CST 12 s 9 3 9 mg /L PAM + 30 g /L + 30 g /L 59. 31% 89. 05% 9 mg /L PAM 30 g /L 30 g /L 7 1 12 3 6 - PAM 9 mg /L 3 PAM 3 6 - /ml SRF / cm g - 1 CST /s /% /% 9 mg /L PAM + 30 g /L + 30 g /L 42 6. 08 10 9 12 59. 31 89. 05 9 mg /L PAM + 30 g /L + 30 g /L 45 2. 54 10 10 12. 9 60. 49 91. 59 9 mg /L PAM + 30 g /L + 30 g /L 38 6. 39 10 9 11. 6 60. 64 90. 24 0. 5 g /L PAC + 30 g /L + 30 g /L 60 3. 25 10 10 15. 8 65. 72 89. 59 0. 5 g /L BAC + 30 g /L + 30 g /L 59 4. 73 10 10 14. 9 66. 40 87. 29 0. 5 g /L + 30 g /L + 30 g /L 72 1. 22 10 10 15. 1 69. 49 81. 11 77

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