Glass ink manufacturers how to deal with water-based ink wastewater?

Glass ink manufacturers in the production of water-based glass ink and the use of the process, due to the cleaning of the equipment, will produce a certain amount of waste water. How to deal with water-based glass ink wastewater?

chemical oxidation-coagulation process

The composition of wastewater mainly includes water-based glass ink, starch and surfactant. Through the use of oxidation decolorant KMnO4, H2O2, NaClO, activated carbon selectivity test; Through the flocculant: Y-13, FSH7, FCH3, FO4248, AN910SH screening test and dosage and pH adjustment test. The results showed that under the best experimental conditions of adding the best oxidant NaClO15g g/L, the best coagulant FCH 30.2g/L and pH adjustment of 8.5, the CODcr removal rate reached 94% and the chroma removal rate reached 100.

ultrafiltration technology

After the wastewater passes through three groups of ultrafiltration modules, the COD removal rate reaches 92%, the solid content in the concentrated liquid reaches 99g/L (about 10%), and the turbidity of the permeable liquid is in the range of 0.13 ~ 0.4NTU. However, the removal rate of COD is closely related to the amount of soluble pollutants, which cannot be removed by ultrafiltration technology.

Coagulation Air Floatation-Contact Oxidation Combined Process

The combined process of coagulation air flotation and contact oxidation can achieve better results in the comprehensive treatment of water-based glass ink wastewater, canteen sewage and domestic sewage. Water-based glass ink wastewater is separated from large suspended solids and then coagulated and floated. After solid-liquid separation, it is mixed with canteen sewage and domestic sewage. After anaerobic adjustment, it is oxidized and aerated by secondary biological contact. The CODcr of effluent reaches 67mg/L and the chroma is less than 10 times. Ink wastewater raw water CODcr up to 182000mg/L, chroma 4000 times, through the flocculant basic aluminum chloride and coagulant caustic soda and polyacrylamide to make wastewater form alum flower after air flotation, COD removal rate can reach 47.6. The wastewater purified by air flotation with a daily displacement of 20 tons is mixed with 100 tons of canteen sewage and domestic sewage (COD<366mg/L), and then subjected to secondary biological contact oxidation treatment after anaerobic pretreatment adjustment. The biological contact oxidation tank A stays for 2.8 hours and B stays for 3.3 hours. This process combination has the characteristics of stable treatment effect and impact resistance.

Micro-electrolysis Process of Iron Scrap

After the pH value of the raw water is first adjusted with HCl, the COD is reduced from 6000~8000mg/L to 800~1000mg/L, and the chroma is reduced from opaque to 160 times. The effluent is then neutralized and precipitated by micro-electrolysis and lime milk. Through the static and dynamic tests of the main process parameters of micro-electrolysis: pH value, iron scrap amount, coke amount and reaction time, the best process conditions of micro-electrolysis are obtained: pH value is 4.0, iron scrap amount is 10%, coke amount accounts for 16.67 of filler amount, and reaction time is 60min. The COD of the wastewater was again removed by 50% and the chroma was removed by 90%. The COD removal rate of the raw water is 85% and the chroma removal rate is 95% by sedimentation pretreatment and iron microelectrolysis, which has a good effect.

chemical coagulation process

Glass ink manufacturers through the commonly used flocculants FeSO4 · 7H2O, FeCl3 · 6H2O, PAC, PFC, PAFC and coagulant cationic polyacrylamide, polyacrylamide, chitosan, dicyandiamide and pH value adjustment screening and dosage selection. At room temperature, the best conditions of coagulation process: FeCl3 · 6H2O is selected as the best flocculant, the dosage is 80mg/L, the best coagulation pH value is 4.0, the best coagulant aid is chitosan, and the dosage is 0.8mg/L. After treatment, the COD of raw water is reduced from 5638.2mg/L to 634.5mg/L, the removal rate is 87%; the chroma is reduced from 240 times to less than 10 times, the removal rate is 99%, and a good test effect is obtained.

Coagulation and air floatation-micro-electrolysis-SBR process

The CODcr of the raw water is 2805.5mg/L, and the chroma is 1562.5 times. After the precipitation and oil separation treatment, the CODcr removal rate reaches 20.4 and the chroma removal rate reaches 10%. After coagulation and air flotation treatment, the removal rate of CODcr reached 74.6%, and the removal rate of chroma reached 83.9%. Then, micro-electrolysis makes the COD removal rate reach 28.6% and the chroma removal rate reach 66%, which improves the biodegradability of the wastewater and the remarkable decolorization effect. Finally, SBR with a volume of 140 m3, BOD5 volume load of 0.18kg/m3 and charging rate of 30% achieves COD removal rate of 82.2 and chroma removal rate of 60%. The final effluent CODcr reached 71.9mg/L, the removal rate was 97.4, the color was 30.7 times, the removal rate was 98%. The treatment effect of the project is obvious, although the removal of COD and chroma mainly depends on coagulation and air flotation, but due to the use of micro-electrolysis process, the biodegradability of wastewater is improved, thus ensuring the stable operation of the SBR process unit.