Revolutionary Biological Treatment Technology

Sulfides Oxidation

Sulphide removal is one big challenge for refinery Effluent treatment. It requires usage of expensive chemicals like H2O2 which pose handling difficulties as well.

BPC supplied ACT technology as first stage biological treatment to a refinery in southern India and were asked to supervise the operations of the plant.

ACT bioreactor is capable of removing sulphides with the right design of retention and aeration. This was shown to a great extent even when the inlet sulphide fluctuations were 500 %.

ACT reactor successfully treated the fluctuations and gave sustainable output. The excellent performance of ACT resulted in eliminating the dosing of H2O2 and saving substantial operational expense.

Sulphide Reduction In Act

Date ACT Inlet ACT Outlet
01-09-2018 96 2.2
02-09-2018 24 4.5
03-09-2018 29 4
04-09-2018 32 1.6
05-09-2018 35 0.8
06-09-2018 110 9
07-09-2018 100 8
08-09-2018 68 23.2
09-09-2018 60 2.4
10-09-2018 38 4
11-09-2018 70 5
12-09-2018 34.7 2.8
13-09-2018 36 3.2
14-09-2018 45 1.2
15-09-2018 38 1.3
16-09-2018 36 2
17-09-2018 49.6 1.3
18-09-2018 35 1.2
19-09-2018 20 0.8
20-09-2018 124 2.8
21-09-2018 128 18
22-09-2018 55.5 4.8
23-09-2018 32 3.2
24-09-2018 36 1.6
25-09-2018 71.8 5.7
26-09-2018 48 4
27-09-2018 26 1.6
28-09-2018 34.8 2
29-09-2018 50 6.4
30-09-2018 30 3

Process Efficiency

90 - 99 %

Efficiency not

10 - 20 % of

Can work in high salinity levels (up to 4%, i.e. 40,000 ppm TDS)

20 %

Significant deduction in OPEX resulted through advanced automation.

0 %

Less Sludge generation when compared to conventional technologies.

0 %

Better resiliency & stable output performance against inlet shocks.

Why Choose

ACT Technology

Automated Chemostat Treatment (ACT) starts with selecting the most efficient bacteria cocktail from the process effluent on BPC’s labs, once this process specific bacteria cocktail is isolated and bacteria cocktail is prepared, the bacteria in delivered to the site as a one time starter. In the bioreactor itself the cells are maintained at a very low concentration inside the bio reactor (MLSS value of around 100-400 ppm dependence on the organic load in the system.

The bacteria concentration is distributed throughout the bio reactor and they act as single cell treatment units as no aggregates are formed; this ensures that the biological oxidation process is highly effective when compared with the concentration that has to be maintained within the bio reactor.

BPC’s ACT is a one flow system as there is no need of recalculating sludge to maintain the required bacteria population in the bio reactor, the rate of growth of the bacteria culture within the bio reactor is always maintained at a rate equal to or higher than the rate at which bacteria culture is being washed away with the out flowing effluent. The HRT for ACT is equal to the sludge retention time, as the bacteria age in the ACT bioreactor is low, the bacteria culture is maintained in its logarithmic growth phase, and this young bacteria population ensures higher bacteria activity and ensures that the process is highly efficient in consuming organic contaminations.

Complete automation and stability are two of the primary advantages of the BPC-ACT system. Each installation is monitored by a series of online sensors with real-time reaction capabilities.  Errors in the system are immediately detected by ACT and dealt with through automatic troubleshooting. Control systems notify operations personnel via SMS and email.  This ensures that BPC’s ACT is able to respond to any changes in the effluent parameters in real time.


The BPC-ACT process transforms water treatment into a more efficient, economical, and ecologically-friendly process using its patented technologies. The system can be applied to a wide range of sites.


Unmatched Stability

ACT Provides Unmatched Stability in face of upsets of organic load and contaminations in the system. This stability is due to a unique control system that automates the complete process of biological treatment (Aeration) which is available only with ACT.


Closed loop Automation

All system parameters are measured online and there is no requirement for laboratory based tests that take 2-3 days to give results. The system runs completely automatically without the need of constant human intervention, handling upsets as they happen.


Broad MLSS Spectrum

ACT is the only system in the world that can operate at a wide variety of MLSS (lowest 300ppm) and F/M ratio (varying between 2 to 20), which means ACT can manage higher inlet fluctuations (both high and low) in organic load than any other system.


Better Upset handling

Conventional systems are not able to perform for 2-3 weeks following an upset resulting in effluent which has parameters over the design limits. ACT is able to avoid most upsets and if an upset occurs, the recovery time is 2-3 days.


Better RO Downstream stability

With an RO system downstream the stability that ACT offers is very important. The RO uptime (operational) is maximized, with no need for dilution of RO make up stream due to ETP non performance during an upset and the recovery.


Better Effluent treatment

Investment in treating effluent that is above specifications is much higher at the RO (chemical precipitation and Ultra Filtration), when it is compared with the investment it takes in the ETP to ensure that effluent is treated properly.


ACT Technology



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