Effect of Mineral Carrier Flocculation on Sedimentation Performance of High Alkali and High Turbidity Wastewater
The discharge of high-alkali and high-turbidity wastewater generated during tunnel construction will seriously endanger the ecological environment.In order to solve this problem,the pH,SS,COD,TOC and other water quality conditions of the water body were studied by taking the inclined tunnel face wastewater of a tunnel in Hongla Mountain,Tibet as the object.The pH adjustment reagent of the water body was explored,and the best pH adjustment reagent was selected.The effect of bal-lasted flocculation of different mineral materials on the sedimentation performance of water body was studied,and the influen-cing factors were explored.The results show that the pH and SS of the water body far exceed the emission standard.The main components of the solid suspension are calcium carbonate and silica.The best pH adjustment reagent is sodium bisulfate.Yang-zhou bentonite(Bentonite produced in Yangzhou area,the main component is montmorillonite)has the most significant effect on promoting the flocculation and sedimentation of water body.The possible factor is that Yangzhou bentonite has the best parti-cle size.In the process of sedimentation,mineral material particles can bridge with flocs to form larger flocs,and can also accel-erate the sedimentation of flocs by gravity.When the addition amount of Yangzhou bentonite is 80%of the SS content of the water body,the promotion effect on the sedimentation performance of the water body is the best.The research results provide new ideas and methods for the treatment technology of high alkali and high turbidity wastewater.
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