How to solve the high turbidity of the effluent from the inclined pipe settling tank

The reasons for the high turbidity of the effluent from the inclined pipe sedimentation tank may be as follows

First, the water distribution at the inlet is not uniform, near the inlet, the liquid movement appears serious turbulence or the water inlet speed is fast, resulting in the local liquid flow speed at the inlet being large so that the original sludge deposited on the inclined pipe rises again;

Second, the phenomenon of "short flow" in the local area affects the stability of the floc, resulting in the early formed floc being easy to re-break into small floc.

Third, to distribute water evenly, the opening range is small, often resulting in the flow rate through the hole being larger than the advective sedimentation tank, resulting in secondary crushing of the alum formed in the early stage, and it is easy to flush the dead mud deposited at the bottom of the water distribution hole, resulting in increased turbidity of the effluent.

The solution:

1. The inclined tube and the horizontal plane are placed at a 60° inclination Angle, and a row of fins are drawn below each inclined tube, and the horizontal plane is still at a 60° inclination Angle. The added fins can significantly reduce the Reynolds number of water flow, and significantly enhance the viscosity of water flow, which is conducive to precipitation. Moreover, the sedimentation path of particles is shortened, and the dense particles are conducive to precipitation.

Second, to ensure uniform water distribution, the use of perforated flower wall water distribution, the horizontal flow rate at the beginning of the water distribution area should be controlled between 0.010 and 0.018m/s.

3. A flat-flow rectifying section is added in front of the inclined tube sedimentation tank, so that the water from the weir does not immediately enter the inclined tube sedimentation tank, but first passes through the flat-flow rectifying section (accounting for 1/3 of the total length of the sedimentation tank). The additional advection section enhances the impact resistance of the sedimentation tank and further reduces the horizontal flow velocity. Strong impact load resistance. At the same time, the diversion wall is added in the advection section and the inclined pipe section, which increases the upward velocity of the inclined pipe and enhances the precipitation efficiency.

Henan Eco Environmental Protection Equipment Co., Ltd specializes in water and wastewater treatment devices and systems, which integrates product development, sales, engineering supporting, and technology consulting service.  Team experience over 8 years in exporting wastewater treatment machines.

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