Alternative Carbon Source

Carbon is required to facilitate the removal of both Nitrogen (N) and Phosphorous (P) in biological nutrient removal (BNR) systems. When WWTPs do not have sufficient organic carbon in their incoming wastewater, a consistent, supplemental source of carbon is used to ensure reliable performance.



LysteCarb Process Flow

Lystek hydrolyzed biosolids can be used as a safe, cost-effective alternative carbon source. We call this product LysteCarb®. Not only does LysteCarb contain a much higher COD:N:P ratio than raw wastewater, but the material is also much higher in concentrations of readily biodegradable COD. This product can replace costly conventional chemicals such as methanol, glycerol, or acetic acid.

When recycled in BNR systems, LysteCarb provides readily available carbon for denitrification and Enhanced Biological Phosphorus Removal (EBPR).

LysteCarb offers enhanced BNR system operations with a safer, cost effective source of carbon for enhanced biological denitrification and phosphorous removal.

Frequently Asked Questions

What is BNR?

Biological Nutrient Removal (BNR) refers to wastewater processes designed to remove nutrients, above the assimilative capacity of microorganisms. BNR involves two processes: biological nitrogen removal and enhanced biological phosphorus removal (EBPR).

A good BNR system can provide significant, positive impact on effluent water quality, by reducing solids, carbon, nitrogen (N), and phosphorus (P) concentrations in discharged water.

Why do WWTPs use BNR systems?

Eutrophication of lakes and estuaries due to the level of nitrogen (N) and phosphorus (P) in wastewater effluent discharges are a significant concern.

Many jurisdictional regulators are evaluating these effects and reducing the allowable levels of N and P in wastewater discharges. BNR systems reduce the amount of N and P discharged to water bodies from wastewater effluent. As a result, an increasing number of Biological Nutrient Removal (BNR) systems are being deployed at wastewater treatment plants (WWTPs).

How does LysteCarb remove N & P from the water stream if it contains N & P?

The ratio of COD:N and COD:P is such that there is a significant quantity of additional carbon that can be utilized for N/P removal.

The COD:N and COD:P ratios in LysteCarb will be dependent upon upstream processes at the plant. We will evaluate these facility specific ratios to determine LysteCarb refeed rates.

Since the Lystek‐processed biosolids could contain as much as 15% solids, how does this impact the BNR system in a WWTP’s operations?

In full‐scale demonstrations, we have returned up to 30% of the total LystekTHP processed to the plant's BNR with no operational issues observed.

Analysis should be performed to ensure there is adequate clarification capacity for the WWTP flows as additional inert solids will be returned to the BNR system. However, the relative quantity is small and there is often no negative impact expected for the BNR system.

Considering LysteCarb for your site?

Contact us or fill out a Facility Assessment form for a site-specific analysis of the potential benefits Lystek THP and LysteCarb can bring to your facility.