Date: Jun. 26, 2021
Sand washing wastewater refers to the wastewater generated during sand washing in the production process of the sand washing plant. Sand and gravel are some of the basic materials of construction. With the increasing demand for sand and gravel, natural sand is facing the pressure of resource reduction and environmental protection. As an important source of construction sand, washed sand will enter the building materials market.
The main pollution factors of sand washing wastewater are chemical oxygen demand and suspended matter, and the content of suspended matter is large, the concentration is about 3000mg/L, and a large amount of mud water is formed. The characteristics of the mud depend on its composition and geological conditions. The general characteristics of mud sewage are that the appearance is earthy yellow, uniform, and viscous, and does not stratify for a long time. If the sludge wastewater is not treated in a timely and effective manner, it will not only waste a large number of water resources, pollute water quality, affect road traffic, and the normal production and life of nearby residents, but will even intensify social conflicts and add disharmony factors to the society.
LZZG has developed environmentally friendly zero-discharge equipment to solve the problems that sand washing wastewater recycling and mud purification treatment. The zero-emission system is mainly composed of a fine sand recovery machine, chamber filter press, and three hydrogen purification equipment. The treatment of sand washing wastewater is nothing more than sediment separation, which is separated by physical methods. Since the sand washing wastewater contains a large amount of sediment, the fine sand is first settled by the natural settlement method of the primary sedimentation tank, and then the solid content entering the dosing and flocculation link is controlled to achieve the purpose of reducing the cost and investment of the medicament. Then by adding a flocculant to form particle precipitation, the supernatant enters the clean water tank for reuse, the lower sludge enters the chamber filter press for sludge dewatering, and the sludge cake is transported for disposal.
The wastewater in the sewage transfer pool is pumped by the vertical pump (4/3) into the trihydrogen purification body (S-6000). The thick mud after the trihydrogen purification body flows into the mud transfer tank by itself. Then it is pumped by the special pump of the filter press, pumped into the chamber filter press, filtered by the filter press into a mud cake, and discharged. At the same time, the trihydrogen purification body overflows the clean water, and the clean water filtered by the filter press is returned to the clean water rotating tank, to realize the recovery and efficiency of fine sand, the dry disposal of solid waste, and the recycling and reuse of water resources.
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