Large water volume: 70-200m³ of water are used for every ton of fabric produced, which is equivalent to 10-30 20m³ water trucks fully loaded to transport the dyeing and finishing water for this ton of fabric. The amount of water used for textile dyeing and finishing in the world is about 5×10⁹ cubic meters per year, which is equivalent to the capacity of 200,000 standard Olympic swimming pools. Such a huge amount of water determines that printing and dyeing factories must be equipped with large-flow collection pipe networks, equalization tanks and efficient treatment equipment to ensure that the dual goals of production and environmental protection are easily achieved.
High-color, high-concentration organic pollution: Dyes, auxiliaries, printing and dyeing slurries and other organic matter content is extremely high, chemical oxygen demand (COD) is usually above 2,000-5,000mg/L; biochemical oxygen demand (BOD₅) is 800-1,500mg/L; color can reach 500-2,000 degrees, and conventional biochemical treatment is difficult to completely remove.
High salt, high suspended solids: bleaching, color fixation and other processes produce a large amount of sodium salts, sulfates, and chlorides, which can make the conductivity exceed 6,000μS/cm; the suspended solids (SS) content can reach 200-500mg/L, which can easily cause membrane blockage and sedimentation system overload.
pH and temperature fluctuate violently: The pH range of process wastewater is often between 4.0-11.0, and the temperature can be as high as 40-60℃. Direct discharge will seriously damage the activity and efficiency of downstream biological treatment units.
Large fluctuations in water quality and obvious impact loads: With the dyeing batches and process switching, the wastewater volume fluctuations can reach a peak-to-valley ratio of more than 3:1, and the instantaneous COD concentration may exceed 10,000mg/L, which poses a great challenge to the stable operation of subsequent treatment facilities.
Based on online water quality monitoring and big data models, flexible configuration of combined processes such as "anaerobic-aerobic-advanced oxidation-membrane separation" to achieve COD, chromaticity, total phosphorus, SS and other indicators once reached.
Innovative introduction of anti-pollution ultrafiltration/reverse osmosis membrane components to intercept high-concentration organic micropollutants, achieve a chromaticity removal rate of more than 99%, effluent COD≤30mg/L, conductivity＜200μS/cm, suspended solids＜1mg/L, easily meeting local regulations and corporate reuse needs.
Through sludge resource technology, the sludge produced by treatment is converted into high-value-added building materials or organic fertilizers.
The whole plant is installed with an intelligent platform to monitor water quality parameters and equipment status in real time, automatically adjust the dosage of reagents and the aeration intensity of the fan, ensure the stable operation of the system 365×24h, and significantly reduce the operating cost.
General contracting
Daily wastewater volume8500t，Daily discharge volume2500t，Daily reuse volume6000t, Collecting tank → mechanical grille → cooling → equalization tank → coagulation and sedimentation → A/O process → MBR → ultrafiltration → RO → reuse
General contracting
Daily wastewater volume5000t，Daily discharge volume1900t，Daily reuse volume3100t, Collecting tank → mechanical grille → equalization tank → drum filter → air flotation → A/O process → MBR → ultrafiltration → RO → reuse
General contracting
Daily wastewater volume10000t，Daily discharge volume4000t，Daily reuse volume6000t, Collecting tank → mechanical grille → equalization tank → cooling → hydrolysis acidification → A/O process → MBR → ultrafiltration → RO → reuse
General contracting
Daily wastewater volume 800t，Daily discharge volume 200t，Daily reuse volume 600t, Collecting tank → mechanical grille → equalization tank → drum filter → intermediate water tank → air flotation → anoxic tank → aerobic tank → MBR tank → MBR water production tank → ultrafiltration → RO → reuse
General contracting
6,000 tons/day, daily discharge volume of 2,500 tons, daily reuse volume of 3,500 tons. Separation pretreatment + cooling + high-efficiency flocculation sedimentation + deep anaerobic biochemical + multi-stage AO biochemical treatment + high-efficiency flocculation sedimentation + MBR membrane treatment + ultrafiltration filtration + reverse osmosis technology
General contracting
3,000 tons/day, flotation + biochemical + sand filtration
General contracting
Daily treatment capacity 4,500 tons, daily standard discharge capacity 2,500 tons, daily reuse capacity 2,000 tons. Equalization tank-shallow pool flotation-cooling system-hydrolysis acidification-contact oxidation-secondary sedimentation tank-dissolved air flotation-MBR tank-ultrafiltration-reverse osmosis-reuse
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