Fertilizer draw solution forward osmosis water and fertilizer integrated irrigation system based on RO concentrated water treatment

Abstract

The invention designs a forward osmosis water and fertilizer integrated irrigation system for a fertilizer draw solution based on RO concentrated water treatment. The forward osmosis water and fertilizer integrated irrigation system comprises an RO concentrated water circulation system, a fertilizer draw solution dilution system, a forward osmosis membrane assembly and an irrigation system, upper and lower threshold values of fertilizer and moisture required by crops in soil are set on the electric cabinet, when the fertilizer and moisture required by the crops are lower than the lower threshold value, the first electromagnetic valve and the second electromagnetic valve are opened at the same time, and the fertilizer and the moisture are automatically mixed in proportion according to the requirements of the crops and then irrigated to the roots of the crops; in the process, the RO concentrated water passes through a forward osmosis membrane assembly, pure water permeates into the fertilizer absorbing solution, and along with continuous circulation of the RO concentrated water and the fertilizer absorbing solution, the RO concentrated water is gradually concentrated, and the fertilizer absorbing solution is gradually diluted. The manufacturing process is simple, manpower and material resources are saved, RO concentrated water is recycled through a permeation method, on one hand, water pressure is relieved, and on the other hand, water and fertilizer are irrigated integrally to achieve the effect of saving water and fertilizer.

Description

Technical field: [0001] The invention relates to the fields of irrigation and water treatment, in particular to a fertilizer extraction liquid forward osmosis water and fertilizer integrated irrigation system based on RO concentrated water treatment. Background technique: [0002] Ningxia is located in the northwest region of my country, far away from the sea, and there is a serious shortage of water resources. How to recycle RO concentrated water (RO concentrated water refers to the high-salt wastewater generated in the process of reverse osmosis desalination) is based on Ningxia water. It is an important means to effectively solve the shortage of water on the basis of the shortage of resources and poor water quality. At present, the widely used water treatment methods mainly include thermal method and membrane method. Among them, reverse osmosis (RO) membrane water treatment technology has been studied earlier and has been developed more maturely. However, due to its high e...

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Problems solved by technology

At present, the widely used water treatment methods mainly include thermal method and membrane method. Among them, reverse osmosis (RO) membrane method water treatment technology has been studied earlier and has been developed relatively maturely. Disadvantages such as large area and easy fouling of the membrane limit further development

[0003] At the same time, the Ningxia Plain area adopts extensive irrigation methods such as flood irrigation and large-scale drainage in agriculture. The drainage ratio is as high as about 0.58, which leads to salinization of the land, lowers grain production, and intensifies soil pollution due to improper fertilization. , the traditional agricultural irrigation separates water and fertilizer, which is time-consuming and labor-intensive

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