How to solve the problem of excessive indicators in wastewater treatment?

Measures to reduce wastewater discharge include treating wastewater for reuse or even zero liquid discharge. Reverse osmosis, nanofiltration, ultrafiltration, and ion exchange technologies can be used in wastewater recovery for reuse. The chosen process may vary depending on the water quality required by the process.

1. Excessive Biochemical Oxygen Demand

When soluble organic matter is consumed by bacteria, it is converted into carbon dioxide and biological flocs, which then settle out of the effluent. Reducing the organic matter content of the effluent and improving BOD levels, the process mentioned (called biological oxidation) is a common method of control BOD achieved by promoting “ food ” and the right balance of organic matter. This can be achieved through proper aeration methods, where air is introduced into the effluent to increase the rate of this biological oxidation, which in turn increases the level of settleable solids, which can then be removed from the effluent by

2. Excessive Total Suspended and Dissolved Solids

Depending on the TSS and TDS levels in the wastewater and the different emission standard levels, the implementation methods will vary. The following methods are commonly used to reduce TSS treatment methods:

• Coagulation

• Flocculation

• Sedimentation

• Sand or carbon filtration

TDS reduction is a more complex process. If the pollutants are metal-based, such as calcium, magnesium, or iron, simple chemical additives can be added during the clarification process to reduce these pollutants. If it is sodium, chlorine, or other highly soluble ions, desalination or evaporation processes may be required.

3. Excess Nitrates and Phosphates

Nitrate Removal: Nitrates can be removed by several methods, including ion exchange, reverse osmosis, or conventional biological treatment and denitrification. Treatment is usually a combination of technologies, so it is important to work with Dio wastewater treatment experts to find the best solution.

Phosphate Removal: Effective methods for removing phosphates from wastewater streams are usually coagulation /chemical precipitation, depending on the type of phosphate present. Some biological treatments, such as the use of anaerobic reactors (which convert organic matter into methane and carbon dioxide) and aeration tanks (injecting oxygen to promote biological floc formation) are also useful.

4. Wastewater Containing Oil and Grease

Wastewater containing grease needs to be treated using a dissolved air flotation unit ( DAF). This unit removes oil by dissolving air in the water under pressure. As the bubbles float to the surface, they attach to the oil and grease, so they can be skimmed off from the top surface. Another method for successfully removing oil and grease includes certain types of filters, such as ultrafiltration or activated carbon.