Water treatment case study

Courtesy of LG Sonic

Wastewater is any water that has suffered in quality by human intervention. Often, wastewater is being treated for re-use as drinking water or for other purposes. As high levels of nutrition are available in these waters, algae may grow rapidly as well as other micro-organisms such as bacteria. Algae can compete for nutrients against the bacteria in charge of sludge reduction and can also clog complete systems. LG Sonic uses the newest ultrasound techniques to remove algae from wastewater treatment plants and reclaimed water reservoirs.

How does the LG Sonic technology work in wastewater?

The LG Sonic systems can be applied in several tanks from the wastewater system. The units are, for example being placed in DAF (dissolved air floatation) tanks, flocculation tanks, clarifiers and sedimentation ponds. In all tanks the units have their benefits.

Maintenance of the LG Sonic device only involves cleaning the transducer head once every 1 or 2 weeks.

Once in operation (in either one of these tanks) the LG Sonic units send out ultrasound of various, very specific frequencies. All these frequencies have been determined by years of research and have proven to be the most effective to control filamentous and floating green algae but also blue-green algae. The different frequencies of the LG Sonic cause certain sound pressures and oscillation of the algal cells, through which some compartments within the algal cells will rupture, for example the cell's vacuole and/or gas vesicles, Furthermore the sound frequencies of the LG Sonic suppress the growth of algae.

In addition, levels of physico-chemical components will be reduced by the LG Sonic solution. Examples are nitrates, phosphates, sulphates, ammonium, 5-days biological oxygen demand (BOD5), chemical oxygen demand (COD), total suspended solids (TSS) and pH-levels. These reductions seem to be a mixture of direct and indirect effects of the LG Sonic treatment.

By inhibiting the algae in their growth, they no longer consume the nutrients that the aerobic and anaerobic bacteria need. Furthermore, the ultrasound emitted by the LG Sonic causes a vibration that can help bacteria with their food finding efforts and speed up the nutrition process. Both phenomena have a positive effect on the growth and population of bacteria, which will speed up the reduction of sludge.

LG Sonic in DAF and Flocculation tanks:

TSS, especially in the DAF and flocculation tank, is of great importance to have a good reaction/interaction between bacteria (aerobic decomposition), chemicals and the waste to be degraded. Thus, the more solids in suspension, the more exposed interacting surface, the more efficient the reaction kinetics will be. In addition the ultrasound emitted by the LG Sonic, reduces large aggregates of solid components and induces declumbing of bacterial aggregates, thus a higher interaction between both solids and bacteria is established.

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