Effluents generating from different industrial activities contain persistent, difficult to biodegrade pollutants in it. These pollutants have complex molecular structure and varying degree of biodegradability. The wastewater matrix is also of challenging nature due to presence of high salinity, toxic inhibitory substances which reduces biological activities of micro organisms a lot resulting in lower removal rates.

Biodegradation of persistent organic pollutants under such inhibitory and suboptimal conditions poses a serious problem as complex molecules require typically a consortia of micro organisms having different roles and tasks to perform for the biodegradation of the target molecule. Often these organisms have non flocculating nature and thus their retention in the reactor is a challenging task due to frequent wash out because of poor settling. This wash out results in very low removal rates, lower process stability and thus lower reactor loading rates for suspended growth only systems resulting in very large reactor volumes associated with bulking and other problems.

biodegradation of persistent organic pollutants

Levapor Carriers: An Ideal Habitat For Non Flocculating Organisms

Due to very high adsorption capacity of Levapor carriers resulting in very high surface area, the non flocculating microorganisms responsible for the degradation of complex molecules can be immobilized on Levapor carrier surface and thus can be retained within the biological reactor. The inner porosity of Levapor carriers also facilitate growth of microorganism within the inner pores which protect them against toxic shock loads and thus their complete wash out and inhibition can be prevented.

Reversible Adsorption: A Unique Feature Of Levapor Carriers

Due to impregnation of PU foam matrix with activated carbon, Levapor carriers offer a unique advantage of Powdered Activated Carbon Technology (PACT) in combination with attached growth process.

When a toxic organic substance enters Levapor based reactor, it initially gets adsorbed on the carrier material due to activated carbon. This adsorption reduces the bulk liquid concentration of the toxic substance significantly which reduces its toxic effect on the suspended growth microorganisms.

Moreover, the carrier material also allows higher growth of microorganisms responsible for the biodegradation of the attached pollutant. Thus, the attached pollutants are effectively and efficiently biodegraded by the microorganisms reducing the concentration of adsorbed pollutant. This degradation of pollutants regenerates the activated carbon restoring the adsorption capacity of the carrier material termed as “reversible adsorption and regeneration’’ . It is unique feature of Levapor carriers offering remarkable process stability against toxic shock loads and effective biodegradation of toxic substances present in the industrial effluents.

As shown in the above figure, when high amount of 2 Chloro Aniline (2CA) is added to Levapor reactor, within few minutes of addition, its concentration in the liquid phase is reduced a lot confirming adsorption on the carrier and reducing its toxicity in the liquid phase. Over next few hours, the biodegradation of 2CA is initiated which is confirmed by the release of Chloride ion in the liquid phase.

Advantages of Levapor Carriers

  • Efficient biodegradation of persistent pollutant
  • Higher COD removal efficiencies
  • Higher loading rates resulting in smaller reactor volumes
  • Remarkable process stability against toxic shock loads and wide range of reactor conditions

We can offer you complete process engineering solution which includes from problem analysis to commissioning of the process for your complex effluent treatment requirement. Get in touch with Levapor team for further action on developing optimal solution for your complex effluent treatment. 

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Amit Christian, having MSc degree in Environmental Science from UK university has more than 20 years of experience in the field of water and wastewater treatment. He has expertise in MBBR and IFAS process design, engineering and process start up /commissioning.