Flocculating Anionic polyacrylamide for construction piling mud

The random discharge of construction mud generated by construction projects can easily lead to river blockage and environmental pollution; reverse transportation by tank trucks can not only cause traffic congestion and road damage, but the mud unloading points will also have a certain impact on the environment. When pouring cast-in-place piles, a large amount of clay, including sand and gravel, etc. will be produced. The mud contains a large amount of suspended liquid of fine mud particles and has a relatively large consistency, so it is difficult to settle naturally. Polyacrylamide needs to be used as a mud-water separation agent, which can achieve a good flocculation effect.

The characteristics of mud depend on its composition and are related to local geological conditions. The specific agent to be used needs to be determined based on on-site sludge selection experiments. The more common ones are anionic polyacrylamide and nonionic polyacrylamide, which are also useful. Low ionicity cationic. Sometimes, in order to make the effluent clearer, it needs to be used together with inorganic flocculants such as PAC. Some commonly used mud-water separation and treatment equipment are mostly plate and frame filter presses, but belt filter presses and geotechnical pipe bags are also used.

In the past, the sedimentation tank method generally used in the piling mud industry occupied a large area, took a long time to process, was difficult to extract the sediment, had poor mud-water separation effects, and caused serious water pollution through direct discharge. In recent years, most of the piling mud industry has adopted a set of processes including system mud collection tank, coagulation tank, clear liquid tank, mud and sand separation system, dosing system, drainage system, and slag discharge system to handle piling mud. Its main working principle is: the mud is collected through pipelines and flows into the collection tank. It is pretreated by a mud dehydrator to remove most of the fine sand and part of the mud in the mud water. The filtrate enters the sedimentation tank through the drainage system, and anions for piling mud need to be added to the sedimentation tank. After the mud water is treated by the filter press, the water in the clear liquid tank can be directly returned to the system to achieve zero discharge.

When the sludge concentration is high, it is generally necessary to add coagulants to improve the water filterability of the sludge and ensure sufficient dispersion of polyacrylamide in the slurry. This can improve the flocculation and sedimentation effect and make it better. to promote mud-water separation. In piling mud, a small trial selection of anions for piling mud must be carried out according to the characteristics of the mud to determine which type of anion is most suitable for the mud that needs to be treated. Therefore, the selection is very important for the role and efficacy of polyacrylamide. Importantly, we cannot simply think that lower molecular weight is better or higher is better. It depends on the results of beaker experiment selection.

Zoomri can support you to choose the suitable modle of anonic polyacrylamide for construction mud.