传统与加载絮凝工艺处理铜镍废水的污泥特性对比研究

COMPARATIVE STUDY OF SLUDGE CHARACTERISTICS BETWEEN CONVENTIONAL AND LOADING FLOCCULATION PROCESS FOR TREATING COPPER-NICKEL WASTEWATER

以高浓度铜镍废水为研究对象,分别采用传统絮凝和加载絮凝工艺,探究了聚合氯化铝(PAC)投加量、阴离子聚丙烯酰胺(APAM)投加量、回流污泥量对出水效果、污泥的脱水性能和沉降性能的影响。结果表明:加载工艺比传统工艺处理效果更好,更节省药剂投加量,对药剂投加量的波动变化适应性更强;PAC的投加量对同种工艺下污泥CST值的影响明显,传统和加载絮凝两种工艺中,不同PAC投加量对应的CST差值最大分别达到9.4 s和8.6 s;不同APAM投加量下,加载工艺产生的污泥CST值总体比传统工艺的小8~9 s,表明加载工艺的污泥脱水性能普遍优于传统工艺;药剂投加量相同时,加载絮凝工艺得到污泥的沉降性能比传统工艺更好;结合出水效果、污泥脱水性能、污泥沉降性能和处理成本,确定采用加载工艺处理铜镍废水,其最佳工艺条件为:PAC=20 mg/L,APAM=4 mg/L,污泥回流量=100 mL。

Taking high concentration copper-nickel wastewater as the object,conventional flocculation and loading flocculation process were used respectively. The influence of dosage of polyaluminium chloride（PAC） and anionic polyacrylamide（APAM）,sludge back flow quantity on the water yield,the settlement and the dewatering performance of sludge were investigated. Results indicated that： Compared with the traditional flocculation process,the loading flocculation process saved the dosage of chemicals,showed stronger adaptability to fluctuation,and had better effect on the treatment of copper and nickel wastewater; the dosage of PAC had an obvious influence on the sludge CST value in the same process,the maximum difference of CST value between different PAC dosage in traditional and loading flocculation process was 9. 4 ~ 8. 6 s,respectively; under different APAM dosage,the CST value of sludge produced by loading flocculation process was smaller than that of traditional process to 8 ~ 9 s,which showed that sludge dewaterability of loading process was generally superior to traditional process; at the same dosage,the sludge settling property of loading flocculation process was better than the traditional process; under the optimum settlement condition,the sedimentation volume of sludge in 10 min in the loading flocculation process was 33% lower than that in the traditional process,and the maximum sedimentation rate was 56% higher,the optimum process conditions for loading flocculation process was as follows： PAC = 20 mg/L,APAM = 4 mg/L,sludge discharge = 100 mL;