BIOCONSULTING Dr. I.Pascik

Compact effluent treatment plant (WWTP)

with minimized excess sludge generation

Kompaktkläranlage mit minimierter Schlammproduktion

High-performance effluent treatment plant
using adsorbing, porous LEVAPOR-carrier

The problem
Mode of operation
Advantages of the technology
Conventional CWWTP are efficient, however
  • they require too much energy for aeration and
  • produce too much excess sludge, treatment of which is expensive.
The solution
High-performance CWWTP, realized as fluidized bed reactor, with integrated clarifyer and highly efficient fine bubble membrane aeration using
  • adapted microorganisms,
  • immobilised on 12 vol.% of porous, adsorbing, easily fluidised LEVAPOR-carrier cuboids.
The mechanically preteated effluent will be treated under aerobic conditions by immobilised microorganisms, whereby COD and ammoniacal nitrogene will be oxidized nearby completely.
Under special conditions the produced nitrate can be converted simultaneously into molecular nitrogene (simultaneous denitrification under aerobic conditions).
The immobilization of the biomass results in a remarkably lower generation of excess sludge.

Fields of application

Biological treatment of
  • municipal effluents in smaller communities
  • industrial effluents
  • contaminated groundwater and landfill leachates
  • decentral treatment of single industrial effluent streams
  • The IMMOBILISATION
of biomass results in faster and better buildup of the „biology“ and buffering of toxic effects.
  • The icrease of biomass concentrations results in higher
  • process stability
  • volume-time-yield and in higher
  • sludge ages.
  • Considerably lower degree of filling of the reactor with LEVAPOR, compared with similar techniques
  • existing reactors can be upgraded easily
  • optimal mass transfer within the carrier cubes
  • simple retention of the carrier in the reactor
  • a special sludge removal from carrier is not required
  • lower energy consumption
  • sufficient oxygene input
  • simplicity and easy operation


Flow-chart of a compact aerobic WWTP


 
inhabitant equivalents Effluent flow O2-input Volume of buffer BIOREACTOR CLARIFYER LEVAPOR
m³/day Kg/day Vol. (m³) height (m) F (m²)
50 10,0 8,7 3,4 3,0 2,5 0,52 0,45
100 20,0 17,4, 6,7 6,0 2,5 1,0 0,90
250 50,0 43,5 16,6 15,0 3,7 2,5 2,20
500 100,0 87,0 33,3 30,0 4,9 5,0 4,50
750 150,0 130,5 45,0 45,0 5,4 7,5 6,80
1000 200,0 174,0 65,0 60,0 6,8 10,0 9,00

Tab. 1: Technical data of compact, high-efficiency aerobic effluents treatment plants


Results achieved in the practice
Comparison of two parallely operated municipal CWWTP´s
Influent = mechanically pretreated municipal sewage effluent
plant I.E. H(mm) V(m³) FNK LEVAPOR
A 25 1.500 3,12 0,65m² no
B 25 1.500 3,12 0,65m² 310 Liter

Tab. 2: Technical Data of CWWTP


Anlage Q LV COD (mg/L) LVN NH4-N (mg/L) NO3N
m³/hr kg/m³x d infl. effl. % El. kg/m³x d infl. effl. % El. mg/L
A without 0,3-0,36 0,5-0,7 215-300 100*-135 37,8-53,5 0,1-0,14 33,0-51,0 2,4-9,6 77,7-92,7 17,3-28,7
B with carrier 0,3-0,36 0,5-0,7 215-300 8,0-15,0 95,0-96,3 0,1-0,14 33,0-51,0 0,1-1,3 97,6-99,8 7,0-14,1
* floating, bulking sludge

Tab. 3: Removal efficiency of WWTP with (B) and without (A) LEVAPOR


plant Q LV COD (mg/L) LVN NH4-N (mg/L) NO3N
m³/h kg/m³x d infl. effl. % El. kg/m³x d infl. effl. % El. mg/L
A without 0,4 1,4 458 114 75,1 0,15 48,7 0,1 99,8 50,4
B mit 0,4 1,4 458 25,6 94,4 0,15 48,7 0,5 99,0 16,1

Tab. 4: Test Nr.2: Removal efficiency of WWTP with (B) and without (A) LEVAPOR

This side is part one Framesets