The water obtained after separation is recycled, and the disposal of sand washing wastewater is simply the separation of mud and water. Reuse it in sand washing. Sand washing wastewater is usually used to separate the mud by flocculation sedimentation with anionic polyacrylamide. Due to the large amount of sand in the sand washing wastewater, it is necessary to use the natural settlement of the initial sedimentation tank to precipitate the fine sand, and then control the solid content entering the dosing flocculation link, so as to achieve the purpose of reducing the cost of the agent. Then, the flocculant such as polyaluminum chloride and anionic polyacrylamide is added to form particle precipitation, the supernatant enters the clear pool for reuse, the lower sludge enters the sludge dewatering equipment, and the mud cake is transported and disposed of.
Anionic polyacrylamide is mainly used in industrial solid-liquid separation process, anionic polyacrylamide as flocculant. Including precipitation, clearance, concentration and sludge dewatering. The main applications are: rural sewage treatment, paper industry, food processing industry, petrochemical industry, metallurgy industry, mineral processing industry, printing and dyeing industry, sugar industry and all walks of life waste water disposal. For municipal sewage, meat, poultry, food processing wastewater disposal sludge precipitation and sludge dehydration. The positively charged groups in the sludge neutralize the negatively charged organic colloids in the sludge. The polymer’s excellent bridging and cohesion function causes colloidal particles to aggregate into large flocs and separate them from the suspension. The effect is obvious and the dosage is small.
Natural sand is facing the pressure of resource reduction and environmental protection. As an important source of building sand, sand washing waste water refers to the waste water produced by sand and stone production enterprises in the process of sand washing. Sand and gravel is one of the basic materials of construction. As the demand for sand and stone increases from time to time. Washed sand will enter the building materials market. Washed sand can be widely used in concrete, mortar and products. Modern construction projects are increasingly showing good market prospects. The gradual replacement of natural sand in quality and quantity is one of the signs that artificial sand production line has entered the new era of development.
