Research and application of precise dosing method in pipe bag solidification and dredging mud process
In order to cut down the bottom mud pollution load of Gehu,optimize the geotechnical pipe bag fast curing slurry technology,the ecological dredging technology application research of Gehu was carried out.The optimal dosage was determined through experiments,and the precise dosing method for mud solidification was proposed and applied in engineering practice.The results showed that the optimal dosage for treating mud with a solid content of 10％-15％was 0.2％PAC to dry mud mass ratio and 0.4‰-0.6‰ PAM to dry mud mass ratio.The precise dosing system was applied in engineering practice,by calculating the required dosing flow rate based on real-time mud flow rate and concentration,and promptly instructing the dosing metering pump to adjust to the calculated dosing flow rate to achieve precise dosing.The error between actual and calculated flow rates did not exceed±5％.The average turbidity,total nitrogen,total phosphorus,ammonia nitrogen,and permanganate index of the effluent from the side of the geotechnical pipe bag were 26.8 NTU,6.29 mg/L,0.19 mg/L,1.02 mg/L,and 5.04 mg/L,respectively.Except for the sedimentation zone pipe that was first put into use,the solid content of the solidified mud in the other sedimentation zone pipe bags reached 40％after two weeks and 50％after six weeks.
pipe bag solidification and dredging mudoptimal dosageprecise dosing
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