Treatment method for zero discharge of high-hardness high-salinity wastewater
A treatment method and high-salt technology, applied in the field of water treatment, can solve the problems of inability to achieve high-level reuse and zero discharge, achieve the effects of improving recycling rate, stabilizing effluent water quality, and solving environmental pollution
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[0021] Combine below figure 1 The present invention will be further described with specific embodiments.
[0022] A zero-discharge treatment method for high-hardness and high-salt wastewater, using such as figure 1 The device shown comprises the following steps:
[0023] 1) The high-hardness wastewater discharged by the paper mill meets the standard, the main water quality indicators are COD=60-80mg / L, hardness=800-1000, conductivity=5000-6000uS / cm, and the hardness and suspended solids are reduced by the first-stage pretreatment device 1 Content and COD pretreatment, the pretreatment device in the first section adopts pretreatment multi-media filter 19, coagulation and dosing slant plate sedimentation, and ozone treatment combination. After pretreatment, the main water quality indicators reach: COD=30mg / L, hardness= 200;
[0024] 2) The wastewater pretreated in step 1) enters the ultrafiltration device 2 of the first section and the reverse osmosis device 4 of the first se...
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