Introduction:-

• The first step to which residual water is subjected when entering a Sewage Farm is a pretreatment. Big solids, sand and grease are removed. 
• Next, water undergoes the so-called primary treatment. Easily settled suspended solids and part of the organic matter are removed. 
• The rest of organic matter, dissolved and suspended, and the rest of solid particles that have not been removed in previous treatments are removed by the so-called “Aerobic Wastewater Treatment Biological Processes”, which is the secondary treatment of the water line. 
• The “Aerobic Wastewater Treatment Biological Processes” can be defined as those processes carried out by a specific group of microorganisms that in presence of oxygen act on the dissolved, suspended and colloid organic and inorganic matter existing in wastewater. 
• They transform that matter into gases and cells that can be easily separated by settling.

 
 General Description:-

• The objective of the Aerobic Digester, is to study and understand aerobic digestion processes and to analyze their main parameters.
• The unit consists of a 20 l capacity reactor vessel with a tubular membrane made of plastic inside to separate the sludge. Wastewater to be treated enters the vessels pumped by a peristaltic pump. 
• This unit includes a thermostatic bath to heat water up to 60 ºC. That water is driven by a pump through a coil inside the reactor. A suitable temperature for the microorganisms population employed in the aerobic digestion will be obtained. 
• The greater amount of oxygen available in the environment in the aerobic digestion, the quicker the bacteria involved in the process will grow. Therefore, a compressor introduces a specific air flow into the reactor through a diffusion plate. 
• The aerobic reactor includes a portable temperature, pH and dissolved oxygen meter to monitor the digestion.

Specifications:

• Bench-top unit.
• Anodized aluminum frame and panels made of painted steel. 
• Main metallic elements made of stainless steel. 
• Diagram in the front panel with distribution of the elements similar to the real one.
• 20 l reactor vessel with a tubular membrane inside. 
• Lid for the reactor with a manual valve and the respective holes. 
• Heating or cooling coil. 
• Thermostatic bath (up to 60 ºC ), 6 l capacity, 600 W. 
• Pump for hot water circulation of the thermostatic bath. 
• Air compressor, range: 0 – 5 l/min. 
• Diffusion plate for the air inlet. 
• Air flow meter, range: 0.4 – 5 l/min. 
• Peristaltic pump, range: 0 – 0.05 l/min. 
• Water flow meter, range: 0.004 – 0.05 l/min. 
• Membrane, muds separation. 
• Overflow for the outlet of filtered water. 
• Valve on the bottom for mud extraction. 
• Temperature, pH and dissolved oxygen meter to monitor the digestion. 
• Control panel, including: 
  • Switch for pump for the hot water circulation. 
  • Switch for peristaltic pump. 
  • Switch for air compressor. 
  • Main switch. 
• Cables and Accessories, for normal operation. 
• Manuals: This unit is supplied with the following manuals: Required Services, Assembly and Installation, Starting-up, Safety, Maintenance & Practices Manuals.