In construction, the construction piling slurry contains a large amount of suspended liquid of fine mud particles, which has a certain viscosity and is difficult to stratify even after standing for a long time. Therefore, it needs to be treated before it can be discharged or recycled. Flocculant for construction mud treatment.
At present, the most commonly used method of construction mud treatment is to use polyacrylamide flocculant as a mud-water separator. The flocculant is a water-soluble polymer. When it is mixed with mud water, the flocculant has bridging, netting, The functions of adsorption and electrical neutralization can destroy the stability of the mud water, and make the mud particles agglomerate and settle quickly from the water, thereby achieving the effect of mud water separation.
The sedimentation tank method used in the industry in the past has a large area, long processing time, difficult extraction of sludge, more difficult to settle, and serious pollution of the water body by direct discharge; the high cost of the tanker truck method cannot fundamentally solve the problem.
In recent years, most of this process system has been used in mud collection tanks, coagulation tanks, clear liquid tanks, sediment separation systems, dosing systems, drainage systems, and slag discharge systems.
Its working principle is: the mud is collected through the pipeline and flows into the hand settling tank, pretreated by the mud dehydrator, removing most of the fine sand and part of the mud in the mud water, and the filtrate enters the second settling tank through the drainage system. The second settling tank must be treated with flocculants. After the mud water is processed by the dehydrator, the water in the clear liquid tank can be directly returned to the system, truly zero discharge. When the sludge concentration is high, the mud dewatering process is directly carried out. Generally, a coagulant needs to be added to increase the filterability of the sludge and to ensure sufficient dispersibility of polyacrylamide in the mud, which can improve the flocculation and sedimentation effect and better promote Mud and water separation.
In infrastructure construction, anionic polyacrylamide or cationic should be selected according to the characteristics of the mud. The mud in different regions should be selected by small-scale experiments to select the polyacrylamide products suitable for the customer's on-site use. According to the summary of our company's long-term experiments, most of the anionic polyacrylamide flocculants used in construction mud treatment have a degree of hydrolysis between 25-40%, and the mud flocculation treatment effect is better.