Demonstration Project Study On The Treatment Of Reservoir Water Derived From Yellow River By Combined Process Of Flotation As Main Technolgy

This study is the the Sub-topics of "Research and Demonstration of Strengthening Conventional Process Integration Technology to the Yellow River Reservoir with High Algae", which is from the third topic of" the Research and Demonstration of the Drinking Water Security Technology System" of "Major Science and Technology Program for Water Pollution Control and Treatment", named " the Research and Demonstration of the Drinking Water Security Technology in the Lower Reaches of Yellow River". This paper is part of the research of "the Research and Demonstration of Flotation Technology as the Core of the Integration ".The raw water of Jinan Yuqing water plant is Yellow River Reservoir (Yuqing Lake Reservoir)water. The water quality characteristics of the the raw water are low temperature and low turbidity, high algae and micro-contamination. Combined with the research results, water plant implement technological transformation. Based on characteristics of the raw water,through optimizing and choosing water treatment procedures,"Pretreatment-flotation-sedimentation tank-activated carbon filter" is identified as the new water treatment process.This study include the following aspects:(1)raw water quality analysis and the anality of the technical transformation necessity of Yuqing water plant;(2) water purification process optimal selection;(3)the study of design parameters of the new water treatment process;(4) the study of treatment effect of the new process;(5) demonstration engineering analysis of Xinan water plant.The raw water quality is better, but it is presented significant seasonal changes. The original process of Yuqing Water Plant is the conventional process and Water treatment effect is poor. So the technological transformation of water treatment process is is very necessary and urgent.According to analysis of the removal methods of algae, organism and taste and odor,"Pretreatment-flotation-sedimentation tank-activated carbon filter" is identified as the new water treatment process. Yuqing water plant changes the two of four groups of procedures:To create a new pretreating chemicals dosing system; To replace the existing pipeline mixing by mechanical mixing; To replace sedimentation tank by flotation-sedimentation tank on the basis of the original horizontal sedimentation tank; To replace sand filter by activated carbon filter on the basis of the original sand filter; To create a new ultraviolet disinfection system. The article describes in detail the design parameters of the main processing unit, and summarizes the advantages of the layout and design of the new process.In November and December of2011, production tests were conducted in the old and new processes. The effect of turbidity, CODMn, UV254, algae and other pollutants removal in the new process was tested. The whole process of the new technology resulted in average removal of turbidity, CODMn, UV254and algae of96.45%,43.56%,57.58%and96.07%, respectively. The data show that:the new process solve the micro-pollution problems of the raw water of Yuqing water plant effectivelyFlotation-sedimentation tank and activated carbon filter are the main treatment units of the removal of turbidity, taste and odor; activated carbon filter is the main treatment units of organic removal; flotation-sedimentation tank is the main treatment units of algae removal. The main treatment units coordinate each other, and can remove algae, organic, taste and odor and other pollution problems of raw water.The removal rate of turbidity, CODMn, UV254and algae of activated carbon filter are0.43%,11.76%,19.59%,6.23%and30.32%higher than those of the sand filter; The removal rate of THMFP, activated carbon filter is15.01%higher than that of the sand filter; The removal rate of turbidity, CODMn, UV254, algae, taste and odor of flotation-sedimentation tank are5.84%,4.89%,14.19%,11.84%and40.51%highter than those of horizontal sedimentation tank. These suggests that the new water treatment process is superior to the old one.In the pretreating chemicals of choice, Potassium permanganate composite is superior to chlorine, chlorine dioxide, activated carbon.Finally, The article describes the floating-movable hood filter process in Dongying Shengli Oilfield Xin’an water plant, and analyse the treatment effect that after transformation, The results showed that the water treatment process based on floating-movable hood filter process run stably, the effluent can meet the national "Drinking Water Health Standards "(GB5749-2006).