铁铝盐复合硅酸钾调理污泥脱水性能试验研究

Experimental study on dewaterability by ferric salt and aluminum salt combined with potassium silicate conditioning sludge

研究了FeCl3、AlCl3、Al2(SO4)3、Fe2(SO4)34种调理剂单独调理污泥时投加量对污泥脱水性能的影响,以及这4种调理剂分别与K2SiO3复合调理时对污泥脱水性能的影响。结果表明,使用单一药剂调理污泥时,FeCl3、AlCl3、Al2(SO4)3、Fe2(SO4)3的最佳投药量分别为4%,8%,6%,8%。并且其中4%的FeCl3调理效果最佳,使污泥比阻(SRF)由5.033×10^6 s^2/g降低至2.688×10^6 s^2/g,毛细吸水时间(CST)由28.1 s降低至16.8 s;这4种调理剂分别与2%的K2SiO3复合投加时调理效果均优于单一药剂调理效果,其中效果最佳的是4%的FeCl3与2%的K2SiO3复合调理,使SRF降低至1.652×10^6 s^2/g,CST降低至12.2 s。调理剂在改善污泥脱水性能时,污泥粘度也会降低,且沉降性能也得到改善,但K2SiO3的使用会对污泥沉降性能产生微小的不利影响。

The effects of dosage of FeCl3,AlCl3,Al2(SO4) 3,Fe2(SO4) 3 on sludge dewaterability and the effects of these four conditioners combined with K2SiO3 on sludge dewatering performance were studied.The results showed that the optimum dosage of FeCl3,AlCl3,Al2(SO4)3,Fe2(SO4)3 was 4%,8%,6%,8%,respectively.And 4% FeCl3 had the best conditioning effect,which reduced specific resistance to filtration(SRF) from 5.033×106 s^2/g to 2.688×10^6 s^2/g and capillary sunction time(CST) from 28.1 s to 16.8 s.When these four conditioners were combined with 2% K2SiO3 respectively,the conditioning effect was better than that of single agent.The best one was the compound conditioning of 4% FeCl3 and 2% K2SiO3,which reduced SRF to 1.652×10^6 s^2/g and CST to 12.2 s.When the conditioner improves the sludge dewaterability,the sludge viscosity will also decrease,and the sedimentation performance will also be improved,but the use of K2SiO3 will slightly deteriorate the sludge settling performance.