How to reduce wastewater color intensity

1. Adsorption decolorization. 2. Flocculation decolorization. 3. Decolorization by oxidation. 4. Oxidation method. 5. Biological decolorization. 6. Decolorization by electrochemical method. 7. Decolorization by membrane separation. Wastewater is generally treated using a combined process of: physical-chemical sedimentation (or flotation) + anaerobic (or facultative anaerobic) treatment + aerobic treatment + physical-chemical sedimentation. It can be seen that for the first step of physical-chemical precipitation mentioned above, a flocculating decolorizing agent is used in combination with PAM as a coagulant aid; this approach not only enables the effective removal of over 40% of COD as well as other substances such as suspended solids and ammonia nitrogen through flocculation, but also, thanks to its unique decolorizing effect, the wastewater can be made colorless or light-colored already in the first step! The cost is just a few tenths of a yuan, laying the foundation for low-cost operation. After biochemical treatment of the wastewater, many companies manage to meet all other standards, but color remains an issue; the wastewater is usually light yellow or brown in color. For example: coking wastewater, printing and dyeing wastewater. Pulp-making wastewater, etc. Units with the necessary capabilities can use activated carbon filtration and adsorption, or oxidation with ClO2 and O3, or even membrane separation for decolorization. However, it is well understood that all of these involve high investment and operating costs! Through comparative testing, we selected a specialized biochemical decolorizing agent for wastewater treatment from a large number of available agents. Depending on the color intensity of the effluent, the dosage is adjusted to keep costs at a minimum while ensuring that the effluent color meets all specified standards.

Adsorption or membrane treatment, in the absence of large amounts of organic matter. All can be handled well.

First, it is necessary to determine whether it are organic substances or inorganic substances that cause coloration in water. If it are metal ions, they can be removed through recycling or precipitation; if it are organic substances, there are many possible methods, but cost is an issue. Generally, when coloration is caused by organic substances, the COD level of the raw water is not very low. Therefore, it is recommended to consider using resins, which can both remove color and lower the COD level. I have seen good results using such resins in the past, and if you need more information, I can share some materials for mutual learning.

It depends on the specific water quality. Floor 2 has already been covered in great detail.

This post was last edited by CoCo070563 on 2016-9-19 22:34. I have done this before; you can contact me via private message.

This post was last edited by CoCo070563 on 2016-9-19 22:35. It is recommended to use our titanium electrodes and try the electrochemical method. Contact via in-site message to discuss in detail