Production Test Research On RJM Treatment Of Mudanjiang Source Water

Raw water quality of north area of china has the typical characteristics of low temperature and turbidity in winter and spring.The reduction of colloidal particles in lowtemperature reduces the chance of particles bumping into each other.Meanwhile the Zeta potential will go up at a lower temperature.It increases the repulsive potential of each other.And attenuation of Brownian motion makes the colloid difficult to elimination.The hydration of colloidal solids in low temperature and turbidity adverses to coagulation.Some of source water has micro pollution problems.And normal processing technology has been difficult to guarantee water quality which also has a waste of energy.Energy saving and reducing consumption is the difficulty of dealing with such water on the basis of effective control of pollutants.It is also important to develop efficient and economical equipment for the process of coagulation and precipitationRaw water quality of Mudanjiang city in Heilongjiang province has the typical characteristics of low temperature and turbidity,and it also has micro pollution problems of organic matter.According to the current situation of water supply system in the water treatment plant of this area.A enhanced conventional water treatment processes technology was studied to improve water quality with low coagulant and energy consumption.It is of great significance to improve the urban water supply safety in heilongjiang province.This project has developed a newly developed enhanced coagulation precipitation process called RJM and simulated mixing and flocculating process of it by software.And precipitation process was analyzed.The flocculant and coagulant aid of the water treatment plant was used during the reasch perioed.And the treatment efficiency was compared both in normal and low temperature period among four processes,such as the new enhanced coagulation precipitation process,the normal coagulation precipitation process of the productive system,the old and new technology system of water treatment plant.The removal capacity of turbidity and organic matters was conducted when the optimal coagulant dosage decrement of the new enhanced coagulation precipitation process was found.The energy consumption advantages of the enhanced coagulation precipitation process was investigated by the determination of head loss.And the project conducted a study of impact load of the new process both in normal temperature and low temperature period.The influence of different pre-ozone dosage and reaction contact time on the enhanced coagulation precipitation process was investigated,and the optimum preozone dosage and reaction contact time was confirmed to provide the basis for the later engineering modification.The study shows that the maximum coagulant dosage declines of the new enhanced coagulation precipitation process was up to 30% in normal temperature period and 25% in low temperature period in case of the same turbidity standard of treated water compared to the new process of water plant;The reason that the new enhanced coagulation precipitation process could optimize coagulant dosage was decided by the role of the enhanced spoiler mixer,hydraulic impeller flocculator and low pulsing precipitation which were developed by the submicroscopic micro vortex contact precipitation theory.The average tatal head loss of the new enhanced coagulation precipitation process was minimum,it was 81.9% of the normal coagulation precipitation process of the productive system,77.3%of the new technology system of water treatment plant,75.1% of the new technology system of water treatment plant.The RJM process showed better treatment efficiency and operational stability.The RJM process also Showed stabilized shock load performance both in normal and low temperature period.And the average sedimentation tank turbidity of the new enhanced coagulation precipitation process could be controled to be close to 1NTU while the organic matter removal rate was stable.When pre-ozone dosage was controlled at 0.8mg/L both in normal temperature and low temperature period,the average concentration of precipitation CODMn of the enhanced coagulation precipitation process could be removed the most,meanwhile the enhanced coagulation effectiveness of pre-ozone was optimum.When pre-ozone dosage was controlled at 1mg/L in normal temperature period and at 0.8mg/L in low temperature period,the average concentration of precipitation UV254 of the enhanced coagulation precipitation process could be removed the most.The precipitation treatment efficiency of the enhanced and the normal coagulation precipitation process showed minor decreasing tendency with the decreasing of pre-ozone reaction contact time.It was suggested that pre-ozone dosage could be controlled at 0.8mg/L and the optimum preozone reaction contact time could be controlled at 5.65 min in actual engineering for economic operation.