Compact systems for waste water treatment

AMV Package Sewage Treatment Plants consists of one or more prefabricated units that can be readily assembled and installed at project site. 

• PROCESS
  General ACTIVATED SLUDGE process is used to design these compact units in 3 renowned categories:

1. Conventional Activated Sludge (CAS) 
   Moderate operation and space requirement, active excess sludge

2. Contact Stabilization (CS)
   Moderate operation, rather active excess sludge, minimum space required

3. Extended Aeration (EA) 
   Easier operation, lower active excess sludge, not sensitive to shock loads, but needs larger tanks.
    

• PROCESS REQUIREMENT
  The plants are designed for small communities from about 400 to 6000 inhabitants up to max. 20000 population.
   

  Process	BSB Rem. Eff.	MLSS	Sludge Age
  	[%]	[mg/l]	[d]
  CAS	85-95	1500-3000	5 – 15
  CS	80-90	1000 - 3000	5 – 15
  EA	80-95	3000 - 6000	20 – 30

   

• TREATED WATER QUALITY & USAGE
  The treated sewage quality::

  BSB5	mg/l	< 20
  CSB	mg/l	< 50
  Feststoffgehalt	mg/l	< 25

  The treated sewage can be used for irrigation of farm lands or disposed in the surface waters. Excess sludge of the package units is used usually as fertilizer for farm lands.
  
   

• MEMRANE TECHNOLOGIES - SBR and MBR 

  AMV also provides recent technologies in the package sewage treatment plants, based on biological treatment process, but with new modifications as follows:

1. Sequencing Batch Reactor (SBR). The SBR (Sequential Batch Reactor) process is a sequential biological wastewater treatment method, essentially divided into five treatment steps in batch mode. The filling stage involves only mixing or aeration to facilitate the biological reaction with the incoming wastewater. The aerobic stage is where the biomass consumes nutrients under controlled conditions. Sedimentation follows, separating solids from the liquid phase, and then the discharge/decanting of the treated wastewater occurs, followed by a resting phase. To achieve continuous operation, the SBR compact system can be modified by dividing the system into two parallel lines, with one line in the filling mode and the other, staggered, in the emptying mode.

2. MBR Membran Bio Reaktor: In this system, the sewage treatment package plant consist of an aeration tank, containing very high MLSS, Instead of secondary settling tank ,there is an immersed ultra filter assembly inside the aeration tank separating activated sludge from the treated waste water. In this case the effluent quality can be achieved as follows:

   BSB5	mg/l	< 5
   Turbidity	NTU	< 1*

   * ... expressed in Sliica scale (mg/l SiO₂)