Automated and Flexible Systems for Wastewater Aeration
The aerobic degradation of organic and oxidizable substances in water requires oxygen that can be introduced into the wastewater via compressed air. Next to supplying the necessary oxygen, systems for wastewater aeration provide the intermixing of wastewaters or sludge to avoid sedimentation inside the tank.
Reasons for Wastewater Aeration
Aeration measures in wastewater treatment plants help increase the system’s operational safety and degradation capacity. The goal when aerating the wastewater is always to achieve the oxygen’s fastest possible phase transition from gas to fluid. This can be attained by either increasing the air mixture’s oxygen concentration or with a mechanical solution that creates an optimal bubble. Depending on the assignment, DAS Environmental Experts integrate a suitable solution into each client’s wastewater treatment system. For instance, should the wastewater
aeration be linked with intermixing the biomass, active system immersion rotor aerators have been established as the best solution. In passive systems such as perforated tubes, membranes or jet aerators are the preferred method. Perforated tubes that provide medium-sized bubble aeration are used for uncomplicated wastewaters in high-load stages (MBBR). When the laboratory analysis reveals the wastewater to have a low lime content, we preferably equip activation systems with membrane aerators.
Flexible Wastewater Aeration with Jet Aerators
When the wastewater treatment goal is to remove lime as well as large solid substances and sludge, while at the same time provide separately operated intermixing and aeration, jet aerators are preferable. The degradation of nitrate nitrogen, for instance, requires the intermixing of the wastewater without an air supply.
DAS Environmental Experts specializes in flexible solutions for wastewater aeration. Our jet aerators can be removed during ongoing system operation which makes system maintenance possible without turning off the entire wastewater treatment.
- Strong circulation and efficient air introduction (controlled separately)
- Specific nozzle design effectively preventing bottom sludge accumulation while keeping solid substances in suspension; independent of the introduced oxygen amounts
- No moving parts requiring particular maintenance
- Ideal for use in MBBR or Activated Sludge Systems
- Mobile solution allows maintenance during ongoing operation
The Use of Jet Aerators in the Paper Industry
Jet aerators are beneficial for the treatment of calcareous wastewaters as they occur in used paper-processing. Calcifications clog membrane aerators typically located at the reactor’s bottom, causing them to operate at a high performance level to offset a loss in pressure. Replacing the membranes by jet aerators eliminates this problem. Jet aerators introduce higher amounts of oxygen into the water, which significantly increases the COD decomposition at the same wastewater volumes.