Phosphate removal in a chemical manufacturing plant in Madhya Pradesh
Background

A prominent chemical manufacturing unit situated in MP near Ratlam is our existing client to whom we provided technology to treat high COD and TDS effluent. They again approached us due to their experience working with us. They wanted to treat an effluent stream with high phosphate content upto 1500-2000 ppm. They asked us to use their old ETP, revive it , commission and make it efficient for phosphate treatment.

👉 Looking to optimize your ETP for phosphate treatment, COD, or BOD removal? Contact us to explore the right biological phosphorus and removal technologies for your industry!

1st Phase: Scrutiny

Our team of experts visited the factory to introspect and identify scope of improvements.

OLD ETP details:

The ETP had primary treatment, biological treatment (Anaerobic), and then a tertiary treatment.

Flow (current)350 KLD
Type of processUASB
No. of UASBR1
Capacity of biological tank950 KL
Parameters of the stream with Phosphate:

Parameters Avg. Inlet parameters(PPM)
COD4300
Phosphate Content1500-1800
TDS3000
2nd Phase : The Blueprint

After scrutiny and brainstorming with our R&D, we concluded to transform the old ETP apparatus into an EBPR unit, i.e., Enhanced Biological Phosphorus removal unit, which involves the introduction of PAOs (polyphosphate-accumulating bacteria) into the biological system along with physico-chemical treatment in primary and tertiary systems, respectively, of the old ETP.

ETP process optimization:

An efficient EBPR unit requires anaerobic as well as aerobic system, as in anaerobic the RbCODs get transferred into VFAs, which are then absorbed by PAOs for efficient phosphate uptake, which is dispersed during the anaerobic process. The PAOs then absorb the phosphate rapidly in the aerobic system. Hence, biomass with phosphate-absorbed PAOs is allowed to settle in the clarifier, and then WAS is removed.

In this scenario, the ETP had a UASB system, but no Aeration system, hence:

  1. We utilized a spare tank of capacity 300 KL located next to USABR, and transformed it into an aeration tank by installing diffusers.
  2. After our recommendation, the industry installed a 50 KL FRP clarifier after the sedimentation system.

Thus, we converted the old ETP into a facultative EBPR unit with integrated biological phosphorus removal capability.

3rd Phase : Technology and Execution

1. Selecting biocultures:

For UASB:

T1B Anaerobio: 

T1B Anaerobio bioculture solutions for phosphate treatment

The perfect solution for an Anaerobic system consists of robust bacteria that can efficiently work in anaerobic conditions, leveraging efficiency in terms of:

  • COD reduction
  • Biomass Generation
  • Methane Generation
  • F/M ratio optimization

Here, since our goal was phosphate treatment and reduction, we amalgamated PAOs as well, which made the product extremely effective to be used in the developed EBPR system.

For Aerobic Tank:

T1B Aerobio:

T1B aerobio bioculture solutions for phosphate treatment

Equipped with highly robust and selective strains of bacteria which when combined with PAOs, made T1B Aerobio the best-suited weapons to remove phosphate levels, thereby increasing the efficiency of the EBPR unit.

2.Dosing:

Initially, we provided a dosing schedule for 60 days, in which 1st 30 days was loading dose, with a higher product quantity, and the second  30 days dose was maintenance dose, which was 1/4th of the loading dose.

ProductT1B AnaerobioT1B Aerobio
Loading Dose100 kgs60 kgs
Maintenance dose40 kgs20 kgs
Point of additionUASBAerobic Tank
3.Process optimization:

Our target was to achieve MLSS of 3500-4000 in the first 15 days. After that, the WAS was wasted at 15 KLD, and RAS was recirculated at 5 KLD.

Results:

After 60 days of implementation:

Parameters Primary OutletUASB OutletClarifier Outlet
COD39001900800
Phosphate1300-1500850-900180
COD Reduction10 %~ 55 %82 %
Phosphate reduction %8-10%~ 65 %~85-90%
Conclusion

With the combined effect of T1B Anaerobio and T1B Aerobio bioculture and process optimization, the client achieved an 85-90 % reduction through the biological system, which further increased after tertiary system. This translated into:

  • Improved microbial activity and settleability.
  • Stable effluent quality, meeting compliance standards.
  • Biocultures are effective in phosphate removal.

This case demonstrates how biology-driven solutions, coupled with system know-how, can deliver tangible performance and cost benefits in industrial wastewater treatment.

👉 Want similar results at your facility? Let’s talk! Contact us now to implement sustainable, biology-based solutions.

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Phosphate Removal with Biocultures
The menace of Phosphate- How to deal with it using Biocultures?

Phosphates are one of the prominent water pollutants, as designated by the NGT in 2019. A Suo-motu cognizance was also taken by the NGT on detergents and especially phosphate accumulation in rivers and water bodies, causing toxic foam, algal deposition, and eutrophication. Phosphates also exert odour and color. Strict limits have been issued to control phosphate accumulation. However, at the wastewater treatment levels, phosphate removal is a bit tough job as it requires multiple stages, effective bioculture solutions, and technical expertise to do so. 

Although chemical and physical separation are essential, it is the bioculture that act as  game changers in phosphate reduction.👉 Want to know how to integrate biocultures in your treatment process? Contact Us to learn more.

Let’s explore the effectiveness and correct mechanism of phosphate removal using biocultures:

1.What are Phosphates?

Phosphates (PO₄³⁻)  are chemical compounds that contain phosphorus.  In industry, mostly chemical intermediates and food processing units have a high amount of phosphates.

2.Why is it a problem for ETP/STP?

  • Poor effluent quality: NGT and most pollution control boards are very stringent in the phosphate levels in the final outlet. If the criteria are not met, it may lead to a bad ESG report and even shutdowns.
  • Eutrophication: Phosphates promote excessive algal deposition and plant growth, leading to depletion of oxygen in receiving water bodies.
  • Effect on biological treatment: High phosphate content may disturb the biological/microbial population. It leads to even growth of filamentous bacteria, leading to sludge bulking, poor biomass settling, and compromising the efficiency of BOD/COD removal.
  • Increased Chemical Dosing costs: High phosphate = higher chemical use → higher sludge production → more dewatering and disposal costs.
  • Risk of Struvite Scaling:  in systems with high phosphate and ammonia, struvite (MgNH₄PO₄) may precipitate, causing scaling in pipes, pumps, and digestors, increasing OPEX and CAPEX.
3. Enhanced biological phosphorus removal (EBPR)

Enhanced biological phosphorus removal (EBPR) processes are designed to culture communities of microorganisms in MLSS that have the Phosphorus Treatment and Removal Technologies. It involves use of specific microbial strains and put in ETP as biocultures. The strains absorb phosphate and are PAOs (polyphosphate-accumulating organisms). These are likely to comprise a variety of bacterial subpopulations, including Acinetobacter, Rhodocyclus, and some morphologically identified coccus-shaped bacteria.

An ideal EBPR process starts with:

  • Anaerobic Zone: The PAOs are first subjected to an Anaerobic environment where Biodegradable COD is fermented into VFA (Volatile Fatty Acids), particularly acetate and propionate, which serve as food for PAOs. PAOs thus metabolize polyphosphate reserve and release phosphorus.
  • Aerobic Zone: In the Aerobic zone, the PAOs take up the released phosphates by multiplying and oxidizing carbon reserves built in the anaerobic phase. Here, WAS (Waste Activated Sludge ) and RAS (Return Activated Sludge) play a very important role.
Critical factors for the success of EBPR:

  • Influent Characteristics:  a minimum influent BOD:P ratio of 25:1 is necessary in order to provide adequate conditions for PAOs to thrive. Note that this ratio is applicable to the influent of the anaerobic phase of the EBPR process.
  • Integrity of the Anaerobic zone: Establishing and maintaining strict anaerobic conditions in the anaerobic zone is critical for PAOs to be able to consume VFAs and store carbon compounds. The presence of oxygen or nitrates will disrupt the process by placing PAOs at a competitive disadvantage with other bacterial populations.
  • Variability: Variability in flows can result in variable anaerobic and aerobic contact times, which can disrupt the process. Flow and load variability can also impact the influent BOD:P ratio. 
  • Dissolved Oxygen: Excessive dissolved oxygen should not travel back to the anaerobic zone hence, DO should be maintained between 0.5 to 1.0 mg/l at the end of the aeration zone.
Conclusion: 

Phosphate removal is different from conventional ETP operations. It requires the right microbes, technical know-how, and physical and chemical treatments. And when physical and chemical treatments are combined with biocultures, can enhance phosphate removal by up to 90%, and also improve microbial population management in wastewater.Ready to revolutionize your wastewater treatment system with biocultures? Contact Us today for customized solutions.

Inference: Phosphorus Treatment and Removal Technologies

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