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How to Choose Nutrient Removal Equipment for Industrial Wastewater
Updated: Sep 9
Overview
Nitrogen and phosphorus are common nutrients in industrial wastewater. If too much reaches rivers or lakes, it can cause heavy algae and plant growth, which can lower oxygen levels in the water. Industries may need special treatment stages to control these nutrients before discharge. Choosing nutrient removal equipment for industrial wastewater depends on the type of wastewater, nitrogen and phosphorus levels, discharge limits and the existing treatment plant. This blog explains the main equipment used for nutrient removal, how biological and chemical methods differ, and what operators should check before selecting a treatment system for an industrial wastewater plant.
Table of Contents
Why Do Nitrogen and Phosphorus Need to Be Removed?
Industrial wastewater can contain nitrogen and phosphorus from raw materials, cleaning operations, food processing, chemicals and other production activities.
The amount that can be discharged depends on the rules that apply to the site. Meeting nutrient discharge compliance may require extra treatment when the existing ETP cannot reduce these nutrients enough.
Before choosing wastewater treatment equipment, test the wastewater for ammonia, nitrate, total nitrogen, phosphate and total phosphorus. COD, BOD, pH and temperature should also be checked because they can affect biological treatment.
These results help operators decide how to reduce nitrogen and phosphorus in industrial wastewater.
For a broader overview of the available approaches, see our guide to nutrient removal in wastewater treatment, including biological and chemical methods.
Equipment Used for Nitrogen Removal
Nitrogen removal usually involves two biological steps: nitrification and denitrification.
During nitrification, certain bacteria convert ammonia into nitrate. The aeration tank, blowers and diffusers are important parts of nitrification equipment because the bacteria need oxygen.
Denitrification comes next. In a denitrification system, other bacteria convert nitrate into nitrogen gas under low-oxygen conditions.
Denitrification also depends on having enough biodegradable carbon available, so understanding the role of a carbon source for wastewater treatment can help when assessing the process requirements.
The treatment plant may need separate aerobic and anoxic tanks, mixers, pumps and internal recirculation lines.
When choosing nitrogen removal equipment, operators should consider ammonia levels, total nitrogen, wastewater flow, temperature and available tank space.
Where an external carbon source is required, the comparison of starch vs liquid carbon source for wastewater treatment can help operators assess their options.
Equipment Used for Phosphorus Removal
Phosphorus can be removed through biological or chemical treatment.
Enhanced biological phosphorus removal uses certain microorganisms that take up more phosphorus than they normally need. The process usually requires carefully controlled anaerobic and aerobic conditions.
Chemical phosphorus removal equipment works differently. Chemicals containing iron or aluminium are commonly used to form phosphorus-containing solids that can then be separated from the water.
Dosing pumps, chemical storage tanks, mixing equipment and settling or filtration units may be required.
The right phosphorus removal equipment depends on phosphorus concentration, discharge limits, sludge handling and the existing plant design.
Biological vs Chemical Nutrient Removal Equipment
The choice between biological vs chemical nutrient removal equipment should be based on wastewater testing rather than choosing one method for every plant.
A biological nutrient removal system uses microorganisms to remove nitrogen and, in some plant designs, phosphorus. Maintaining the right microbial conditions is also important, as micronutrient deficiency in wastewater treatment can affect biological activity and nutrient removal performance. It requires suitable tank conditions and careful control of oxygen, pH, temperature and organic matter.
Chemical treatment can remove phosphorus without depending on biological uptake, but it requires chemical storage and dosing and can produce extra chemical sludge.
Some plants use both methods.
For example, biological treatment may handle most nutrient removal, while chemical treatment may be used when lower phosphorus levels are required.
What Equipment Is Used for Nutrient Removal in Wastewater Treatment?
When asking what equipment is used for nutrient removal in wastewater treatment, think about the complete treatment process rather than one machine.
An industrial nutrient removal system may contain aeration tanks, anoxic tanks, anaerobic zones, blowers, diffusers, mixers, recirculation pumps, chemical dosing units and clarification equipment.
Instrumentation is also useful. Dissolved oxygen, pH, ammonia, nitrate and phosphate measurements can help operators see how the treatment process is behaving.
Some plants may need tertiary wastewater treatment after biological treatment. Filtration or another polishing stage can help the plant meet stricter discharge requirements.
Supporting Biological Nutrient Removal
Microorganisms carry out the main reactions inside a biological nutrient removal system.
BactaServe Nutrient Removal is a microbial culture intended to support the removal of nitrogen and phosphorus in wastewater treatment systems.
A microbial product should be used alongside correct plant operation. Different biological treatment requirements may call for different wastewater treatment biocultures, depending on the plant conditions and treatment objective. Poor aeration, unsuitable pH, very short retention time or unsuitable wastewater conditions can still affect treatment.
The condition of the biological tank should be checked before changing the microbial programme.
Which Nutrient Removal System Is Best for Industrial Wastewater?
There is no single answer to which nutrient removal system is best for industrial wastewater.
Start with the incoming nitrogen and phosphorus levels and the discharge limits the plant must meet. Then check wastewater flow, COD, BOD, pH, temperature, available space and the condition of the existing ETP.
This is the practical basis of how to choose nutrient removal equipment for industrial wastewater.
For industrial plants requiring biological support, industrial wastewater treatment biocultures can be selected according to the characteristics and treatment requirements of the effluent.
Plants with suitable biological conditions may use nitrification, a denitrification system and enhanced biological phosphorus removal. A pharmaceutical ETP ammoniacal nitrogen removal case study can also provide a practical example of how biological nutrient removal is applied in an industrial treatment system. Other plants may need chemical phosphorus removal or tertiary wastewater treatment.
Where microbial support is needed, BactaServe Nutrient Removal may be considered as part of the biological treatment programme.
Conclusion
Choosing nutrient removal equipment for industrial wastewater starts with knowing what is in the wastewater and what discharge limits must be met.
Nitrogen removal may require suitable nitrification equipment followed by denitrification. Phosphorus may be removed biologically, chemically or through a combination of methods.
A well-planned industrial nutrient removal system should match the actual wastewater load and the existing ETP. Regular testing also helps operators check nutrient discharge compliance and decide how to reduce nitrogen and phosphorus in industrial wastewater without adding treatment stages that the plant does not need.
Frequently Asked Questions
How to choose nutrient removal equipment for industrial wastewater?
The best approach is to evaluate wastewater characteristics, nutrient levels, treatment capacity, and discharge standards. Choosing equipment that matches your process will deliver better long-term performance.
What equipment is used for nutrient removal in wastewater treatment?
Common wastewater treatment equipment includes biological reactors, aeration tanks, clarifiers, nitrification equipment, denitrification systems, phosphorus removal equipment, and tertiary treatment units.
How to reduce nitrogen and phosphorus in industrial wastewater?
The most effective way is to use a biological nutrient removal system that supports nitrification, denitrification, and biological phosphorus removal. In some cases, chemical treatment may also be used to achieve lower discharge limits.
Which nutrient removal system is best for industrial wastewater?
For most industrial applications, a biological nutrient removal system offers the best combination of treatment efficiency, lower operating costs, and long-term reliability.
Biological vs chemical nutrient removal equipment: Which is better?
Biological systems are generally preferred for long-term operation because they use fewer chemicals, produce less sludge, and remove both nitrogen and phosphorus efficiently. Chemical systems are often used as a secondary treatment when stricter phosphorus limits need to be achieved.
