Combined enhanced treatment process for low-turbidity high-alga raw water

Abstract

The invention discloses a combined enhanced treatment process for low-turbidity high-alga raw water. The treatment process is characterized in that according to raw water, the turbidity in winter is about 5NTU, and temperature less than 5 DEG C, or one liter of raw water contains more than one million algae in summer, and the treatment process comprises the following steps of: settling under the conventional condition by using a flocculation horizontal sedimentation tank or a high-efficiency sedimentation tank, performing air floatation by using an air floatation tank to remove algae, allowing outlet water to flow through an ultra filter membrane further to reduce turbidity and remove algae, adjusting storage by using a clear water tank, and feeding into a water distribution network by using a water feeding pump house. According to the low-turbidity and high-alga characteristics of the water quality of the raw water, the conventional coagulating sedimentation, air floatation, filter and ultra filtration processes are optimized and combined, and the utilization of geothermal resources of plant areas is fully considered, so that an enhanced conventional treatment system is formed. The combined process has the advantages that used land can be saved, the process can be optimized, the geothermal resources can be fully utilized, the production management can be simplified, and the water quality of the outlet water has obvious advantages.

Description

technical field [0001] The present invention is a water treatment combined enhanced process involved in water supply engineering, specifically a combined enhanced treatment process for raw water with low turbidity and high algae, which uses combined and enhanced conventional treatment for raw water with low temperature and low turbidity in winter and high algae in summer to achieve high-efficiency treatment The goal. Background technique [0002] The quality of surface water varies greatly in my country, and the difficulty of treating low-turbidity and high-algae raw water represented by lakes and large reservoirs is no less than that of high-ammonia nitrogen and high-organic matter micro-polluted water sources. During the low turbidity period in winter, the effect of coagulation and sedimentation is poor, causing the turbidity of the effluent water in the sedimentation tank to sometimes even be higher than that of the influent water, which increases the burden on the filtra...

AI Technical Summary

Problems solved by technology

During the low turbidity period in winter, the effect of coagulation and sedimentation is poor, causing the turbidity of the effluent water in the sedimentation tank to sometimes even be higher than that of the influent water, which increases the burden on the filtration process; After the pond, the surface of the filter material is blocked and the filter layer penetrates, causing algae to enter the clean water reservoir and the pipe network

[0003] At present, tap water plants with low-turbidity and high-algae raw water as drinking water sources adopt general conventional treatment processes. When the winter turbidity is around 5 NTU and the temperature is lower than 5°C, and the summer algae exceeds 1 million per liter, it is difficult to reach the new factory. Water quality standards that require a combination of intensive conventional treatment measures

Recently, with the improvement of drinking water quality standards, in some areas, the turbidity of factory water has been paid more and more attention as an important control index of factory water quality. The standard of modern water plants in Zhejiang Province has raised the turbidity requirement to below 0.1NTU. It is difficult to achieve such a high water discharge requirement

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