Purifying treatment and recycling process for high-salt-content reclaimed water

Abstract

The invention discloses a purifying treatment and recycling process for high-salt-content reclaimed water, which comprises the following steps: flowing high-salt-content reclaimed water into a recycling water tank, then pumping into an adsorption and neutralization reactor through a lifting pump, adding lime to clarify, and then flowing into a uniform granule filter tank; flowing the water subjected to clarification and filtration in the previous step into a clean water tank, pumping into a nano filter through a clean water pump, performing further purifying treatment, feeding the water which has passed through the nano filter but still has excessive pressure into a hyperbranching catalytic adsorber to remove pollution factors which can cause membrane blocking easily, and then feeding into an intermediate water tank; pumping the water in the intermediate water tank into a cartridge filter through an intermediate water pump, pumping into an electrically driven membrane filter through a high-pressure pump, feeding the fresh water subjected to deep desalination of the electrically driven membrane filter into a fresh water tank, and feeding to a user for recycling through a fresh water pump; and feeding the residual thick water into the recycling water tank to realize zero discharge, or feeding into a P / F remover and then flowing into a BAF tank to remove COD (chemical oxygen demand) and NH3-N so as to realize up-to-standard discharge. By adopting the scheme of the invention, the sewage recycling rate can be up to 80% or above, and the treatment cost is low.

Description

technical field [0001] The invention relates to sewage treatment, in particular to a process for reuse of high-salt neutral water discharged up to standard after treatment of industrial waste water and domestic sewage. Background technique [0002] my country is a country with a shortage of water resources. With the rapid development of various fields such as industry and agriculture, the demand for water resources has also increased sharply, resulting in rivers being cut off, exploitable groundwater resources are becoming less and less, and industrial and agricultural water costs. Higher and higher. With the scarcity of water resources, water supply has become a restrictive factor for business expansion. [0003] In order to ensure that the discharge standard is met, industrial wastewater treatment often adds excessive lime and other treatment chemicals, resulting in high salt content and high hardness after treatment. Direct use in agricultural irrigation will caus...

AI Technical Summary

Problems solved by technology

[0003] In order to ensure that the discharge standard is met, industrial wastewater treatment often adds excessive lime and other treatment chemicals, resulting in high salt content and high hardness after treatment. Direct use in agricultural irrigation will cause soil salinization, and use in industry will cause negative effects such as scaling and blockage. Affect its use, often direct discharge

In the existing technology, the method of reclaimed water reuse is through biological treatment + sedimentation + filtration. This process not only has a relatively high infrastructure cost, but also has a poor treatment effect, which affects the scope of reclaimed water reuse. At the same time, the process of this process The operability is also relatively poor, and the effect of biological treatment needs to be controlled

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