Graded filtration water treatment system and water treatment process

Abstract

The invention discloses a graded filtration water treatment system and a water treatment process. The water treatment system is used for filtering raw water to be treated to obtain produced water, and the water treatment system comprises a first filtering unit, a second filtering unit and a concentrated water recycling unit; the first filtering unit comprises an ultrafiltration membrane assembly; the second filtering unit communicates with the first filtering unit so as to obtain produced water through filtering, the second filtering unit comprises a nano-filtration membrane assembly, a sealing ring is arranged at the end of the nano-filtration membrane assembly, and a fracture part is arranged on the sealing ring; and the concentrated water recycling unit is connected with the second filtering unit and is used for recycling concentrated water formed after filtering. According to the invention, energy consumption can be reduced, water recovery rate is high, operation cost is reduced, cleaning is convenient, part of bivalent mineral ions are retained in produced water, and drinking water quality is improved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a water treatment system and a water treatment process of graded filtration. Background technique [0002] Water resources are resources that human beings rely on in production and life. However, people's excessive consumption and industrial pollution have led to a serious shortage of water resources, posing a serious threat to the already extremely scarce fresh water resources. Facing such a severe situation, it is imminent to seek an efficient and energy-saving water resource regeneration technology. [0003] At present, the commonly used process in the water production process of the drinking water industry is the reverse osmosis membrane process. This process is widely used in seawater and brackish water desalination, industrial wastewater treatment, ultra-pure water preparation and other fields. It can effectively remove bacteria harmful to the human body. Microorga...

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Problems solved by technology

However, people's excessive consumption and industrial pollution have led to a serious shortage of water resources, posing a serious threat to the already extremely scarce fresh water resources. Facing such a severe situation, it is imminent to seek an efficient and energy-saving water resource regeneration technology

[0003] At present, the commonly used process in the water production process of the drinking water industry is the reverse osmosis membrane process. This process is widely used in seawater and brackish water desalination, industrial wastewater treatment, ultra-pure water preparation and other fields. It can effectively remove bacteria harmful to the human body. Microorganisms, but at the same time, due to the addition of a large amount of chemicals, such as chlorine-containing disinfectants, the content of mineral ions in the filtered water becomes very small, which cannot meet the needs of high-quality drinking water, and due to repeated use, it will cause membrane Pollution phenomenon, reduced flux, and reduced water treatment performance. At the same time, the reverse osmosis membrane process has the problems of high overall energy consumption, high operating costs, and low system recovery rate. What is more serious is that the existing reverse osmosis membrane process has problems The dense water sealing ring of the device is in the shape of a bell mouth, so the direction of water flow can only flow from left to right, so the cleaning effect is not thorough during chemical cleaning

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