Method for preparing high-quality drinking water

Abstract

The invention provides a method for preparing high-quality drinking water, and belongs to the technical field of feed water advanced treatment. A conventional treatment process is combined with a membrane technology, wherein raw water enters a coagulating basin through a lifting pump, and after coagulation treatment, the raw water directly enters an immersed ultrafiltration membrane basin from anoverflow weir at the upper part of the coagulating basin for ultrafiltration treatment; ultrafiltration produced water enters the nanofiltration device, so that trace organic pollutants in the water are removed while inorganic salt is reserved; the nanofiltration device is of a one-stage three-section design with in-section internal reflux, and the nanofiltration produced water is high-quality drinking water. According to the method, the surface water is treated by adopting a coagulation-short process ultrafiltration-nanofiltration combined process, wherein trace organic matters harmful to a human body are removed, most of inorganic salt is reserved, and the produced water conforms to the current concept of healthy water; the system recovery rate is high, no chemical agent (scale inhibitor) needs to be added in the nanofiltration operation process, the produced water quality is stable, the technological process is simple, membrane method treatment is adopted, occupied land is saved, the device integration degree is high, the occupied area is small, and the operation cost is low.

Description

technical field [0001] The invention relates to the technical field of water supply advanced treatment, in particular to a method for preparing high-quality drinking water capable of effectively removing trace organic compounds (TrOCs) and retaining elements beneficial to human body. Background technique [0002] With the prominent environmental pollution problems, the complexity of drinking water sources increases, and the water sources vary greatly with the seasons, and there are continuous sudden drinking water pollution incidents. With the development of technology, people are increasingly concerned about the impact of trace organic pollutants (drugs and personal care products, endocrine disruptors, persistent organic pollutants, perfluorinated compounds, microplastics, etc.) With continuous improvement, local water quality standards are becoming increasingly stringent. For example, the Shanghai water quality standard stipulates that TOC≤3mg / L, and the drinking water sta...

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Problems solved by technology

[0005] Patents involving nanofiltration treatment of slightly polluted surface water as drinking water, such as the Chinese invention patent application number 201711079643.X, which discloses a solar-driven multi-purpose drinking water membrane separation system and the use of this system to treat polluted surface water and groundwater According to the method, the device can use four kinds of processes to combine micro-polluted water sources as drinking water, but the nanofiltration membrane used in this patent has a high removal rate and removes most of the inorganic salts. In the implementation example, microfiltration + ultrafiltration + nanofiltration Filtration combination process, influent water conductivity 247.4-625.7μs / cm, hardness 375-682mg / L, product water conductivity and hardness are very low, conductivity 8.53-12.7μs / cm, hardness 3.3-5.7mg / L, not in compliance healthy water concept

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