Abstract
A large number of particles with small size and light density in mine water are difficult to remove by traditional separation equipment. In order to improve the efficiency of mine water treatment, a cone-plate clarifier is proposed in this paper. The particle size distribution and their fragmentation fractal dimension were studied in 15 sampling points of the cone-plate clarifier to elucidate the process of floc growth and settling. The influence of the tangential inlet velocity size distribution characteristics was also studied. The results showed that the cone-plate clarifier can effectively improve suspended solids and turbidity removal efficiency. The floc growth and settlement courses are shown in the charts. The cone-plate clarifier was divided into four zones: micro flocculation, floc growing, settlement, and exit pipe. Because the fluid enters the cone-plate clarifier tangentially, the value of the inlet velocity and the tangential velocity are equal at the inlet feed. With the increase in tangential velocity, the flocculation efficiency first increased and then decreased. Comprehensive analysis of the particle greater than 50 μm in the effluent showed that the optimal inlet was qual to 1.63 m/s. By fitting the equations, the optimal SS and turbidity removal efficiency reached the maximum values of 92.04% and 80.18% at the inlet velocity of 1.86 m/s and 1.77 m/s, respectively.
Highlights
In recent years, the problem of water pollution is becoming more and more serious, which has attracted the attention of many people [1,2,3]
Materials and Detecting Equipment in a cone-plate clarifier at different inlet velocities to study the effects of particle size distribution (PSD) and fragThe fractal coal mine water used in this research came from a mine in Ningxia, China
A cone-plate clarifier was proposed to remove the particles with small size and low density in mine water
Summary
The problem of water pollution is becoming more and more serious, which has attracted the attention of many people [1,2,3]. A large amount of mine water is pumped to the surface in the process of coal mining. The mine water contains a lot of particles such as coal powder, sand, and stone [4,5]. The aggregation of small particles into large particles is the key to removing suspended solids (SS), turbidity, and particle number in water treatment works [8,9]. Due to the small size, light specific gravity, and slow settling speed of particles in mine water, it is difficult to remove them [10]. It is very meaningful to study the aggregation and settlement mechanism of particles in mine water
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