Low-temperature low-turbidity period filter tank backwashing waste water coagulation reuse technical method

Abstract

The invention discloses a low-temperature low-turbidity period filter tank backwashing waste water coagulation reuse technical method. The method comprises the following steps: S1) regularly flushing a raw water filter tank, respectively passing the backwashing waste water in the raw water filter tank through a first flow pump and a second flow pump and conveying the waste water to a first backwashing waste water pool and a second backwashing waste water pool for storage; S2) stirring the backwashing waste water; S3) detecting the turbidity value; S4) setting a turbidity preset value of mixed water by a controller system and calculating the frequency of a reflux pump in the first backwashing waste water pool or the second backwashing waste water pool; S5) controlling the reflux ratio Phi of the backwashing waste water in the first backwashing waste water pool or the second backwashing waste water pool into a horizontal mixed sedimentation tank by the reflux pump; S6) performing coagulation; and S7) detecting the turbidity value of the mixed water in the horizontal mixed sedimentation tank, if the turbidity value of the mixed water is qualified, discharging water to the users by a water plant, and if the turbidity value of the mixed water is unqualified, performing secondary coagulation. The technical method solves the difficult control problem of the low-temperature low-turbidity period water turbidity, reinforces the low-temperature low-turbidity period water treatment effect, and guarantees the water quality.

Description

technical field [0001] The invention belongs to the technical field of water treatment in a filter tank of a water purification plant, and in particular relates to a technical method for coagulation and reuse of backwash wastewater from a filter tank in a low-temperature and low-turbidity period. Background technique [0002] Since the raw water quality has a period of low temperature and low turbidity for 3 to 4 months every year, it is more difficult to control the water quality of the water purification plant, especially the control of turbidity. However, the existing backwash wastewater reuse method in water plants only considers the recycling of wastewater to reduce the impact of wastewater discharge on the environment. It adopts a treatment method in which the backwash wastewater is separated and returned to the supernatant after sedimentation, without consideration To the enhanced coagulation of backwash wastewater on low-temperature and low-turbidity water, that is, ...

AI Technical Summary

Problems solved by technology

However, the existing backwash wastewater reuse method in the water plant only considers the recycling of wastewater to reduce the impact of wastewater discharge on the environment. To the enhanced coagulation of backwash wastewater on low-temperature and low-turbidity water, that is, after 30 minutes of sedimentation, the supernatant is returned to the raw water pipeline in front of the mixing tank, and the sediment at the bottom of the tank is scraped to the mud tank by a mud scraper The sludge return pump is transported to the sludge balance tank for treatment. In this reuse method, the water quality of the supernatant is better, and the turbidity is generally around 10NTU, which has little impact on the raw water quality. The strengthening effect of low turbidity water is limited, and the solid content of the sludge at the bottom of the tank is low, which has a great impact on the sludge dewatering system

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