Industrial wastewater zero discharging technology for phytoextraction industry

Abstract

The invention discloses an industrial wastewater zero discharging technology for the phytoextraction industry. The technology comprises the steps of 1, rough filtration, wherein rough filtration is conducted on wastewater; 2, pH adjustment, wherein pH adjustment is conducted on wastewater with acid or alkali to enable the pH of water to be 4-9; 3, electric flocculation reaction, wherein wastewater with the pH adjusted is introduced into an electric flocculation system for reaction; 4, solid-liquid separation, wherein water discharged after electric flocculation enters a solid-liquid separating system so that solid slag and electric flocculation clear liquid can be obtained; 5, ultrafiltration treatment, wherein electric flocculation clear liquid is introduced into an ultrafiltration system to generate ultrafiltration concentrated solution and ultrafiltration dialyzate, and ultrafiltration concentrated solution is returned for electric flocculation reaction; 6, reverse osmosis treatment, wherein ultrafiltration dialyzate is introduced into a reverse osmosis system for reverse osmosis treatment, then reverse osmosis dialysis water is reused for production, and reverse osmosis concentrated solution is returned for ultrafiltration treatment. The technology has the advantages that structural design is scientific, technological process is short, produced water is reused, cleaner production is realized, and industrial wastewater zero discharging is realized.

Description

technical field [0001] The invention relates to the field of wastewater treatment in the plant extraction industry, in particular to a zero discharge process for production wastewater in the plant extraction industry. Background technique [0002] The plant extraction industry wastewater is the wastewater produced by the relevant plant extraction companies in the process of extracting the required active ingredients from plant branches, leaves, fruits, tubers, flowers, etc. The main characteristics of wastewater from the plant extraction industry are large water volume, high chroma, high COD, strong acid, alkalinity, and large changes in water quality. The plant extraction industry needs 50-80 tons of water for processing 1 ton of dry matter, of which more than 90% becomes wastewater. Wastewater contains pigments, cellulose, alkaloids, high COD, acids, alkalis, inorganic salts, etc., which are difficult to treat industrial wastewater. [0003] The main methods used in the ...

AI Technical Summary

Problems solved by technology

However, the traditional treatment process cannot well grasp the characteristics of the wastewater in the plant extraction industry to make a breakthrough

The traditional process still has many limitations in the treatment of wastewater in the plant extraction industry: 1. The process is cumbersome and occupies a large area; 2. It relies too much on biochemical treatment, and the characteristics of large changes in water quality will bring instability and processing pressure to biochemical treatment. 3. A large amount of chemical drugs need to be added, resulting in an increase in the salinity of the water body, which increases the load on the recycling system, makes the system clean frequently, cannot normally meet the recycling requirements, and has high operating costs, etc.

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