Difference between revisions of "B3 - Test run"

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Line 26: Line 26:
 
Tests include both chemical, physical, and ingredient analyses.
 
Tests include both chemical, physical, and ingredient analyses.
 
The following contaminants/contrary materials are measured (relative to the organic fraction)
 
The following contaminants/contrary materials are measured (relative to the organic fraction)
−
* Organic
+
* Putrescible
 
* Plastics
 
* Plastics
 
* Metals
 
* Metals
Line 43: Line 43:
 
* surnatants
 
* surnatants
  
−
Foreseen adjustment of the prototype considering the case of piston extruder technology can be done acting mainly on the following:
+
Main process data monitored are:
−
* pressure;
+
* Chemical composition of OFMSW and WAS influent (average monthly)
−
* distance between piston (or screw) an cylinder (chamber);
+
** TS, g/kg
−
* screen patterns (hole diameter and distribution).
+
** TVS, %TS
 +
** TCOD, mgO2/l
 +
** TKN, mgN/l
 +
** Ptot, mgP/kgTS
 +
** Alkalinity, mgCaCO3/l
 +
** pH
 +
* Operational conditions in the reactor
 +
** Feed caracteristics
 +
*** Material
 +
*** TS feed, %
 +
*** TVS feed, %TS
 +
** Operational conditions
 +
*** OLR (kgTVS/m3reactor day)
 +
*** HRT (days)
 +
*** Digester temperature, °C
 +
** Process parameters
 +
*** pH
 +
*** Alkalinity (@pH 6), gCaCO3/l
 +
*** Alkalinity (@pH 4), gCaCO3/l
 +
*** Volatile fatty acids, mgCOD/l
 +
*** TS reactor, %
 +
*** TVS reactor, %TS
 +
** Yields
 +
*** GP, m3biogas/twaste
 +
*** GPR, m3biogas/m3reactor day
 +
*** SGP, m3CH4/kgTVSfeed
 +
*** SGPsludge, m3CH4/kgTVSfeed
 +
*** SGPofmsw, m3CH4/kgTVSfeed
 +
*** CH4, %
 +
*** TVS removal, %
  
−
While pressure regulation can be done continuously, changes in distance between piston and cylinder and subtitution of screens must be off-line, with mechanical operations.
 
  
 +
Foreseen adjustment of the prototype considering the case of extruder technology can be done acting mainly on the following:
 +
* extruder piston pressure (or cochlea speed);
 +
* distance between piston (or cochlea) and the head of extrusion chamber;
 +
* screen patterns (hole diameter and distribution).
  
 +
While pressure regulation and feeding can be done continuously, changes in distance between piston and cylinder and subtitution of screens must be off-line, with mechanical operations.
  
−
Process data monitored are those in table 1 and 2 <ref name="processdata"> Table 1 – Characteristics of OFMSW influent (average monthly) and Table 2 – Average monthly total VSS and COD load of sludge (PS+WAS) and OF-MSW </ref>
+
Adjustments on mixer are about rotation speed and the height of suction pump.
−
 
 
−
 
 
  
 +
Ajustments on digester are about 
  
  
Line 77: Line 109:
 
== Notes and References ==
 
== Notes and References ==
 
<references />
 
<references />
−
 
−
 
−
Table 1 – Characteristics of OFMSW influent (average monthly)
 
−
 
−
 
−
{| class="wikitable"
 
−
| '''Date'''
 
−
| '''COD'''
 
−
| '''(mg/l)'''
 
−
| '''Average'''
 
−
| '''Quantity'''
 
−
| '''(m3/day)'''
 
−
| '''VSS Load'''
 
−
| '''(kg/day)'''
 
−
 
−
|-
 
−
| Month 1
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
 
−
|-
 
−
| Month 2
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
 
−
|-
 
−
| ...
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
 
−
|}
 
−
Table 2 – Average monthly total VSS and COD load of sludge (PS+WAS) and OF-MSW
 
−
 
−
 
−
 
−
{| class="wikitable"
 
−
| '''Date'''
 
−
| '''Total VSS inserted (kg/day)'''
 
−
| '''Total COD inserted (kg/day)'''
 
−
| '''Total VSS inserted (kg/day)'''
 
−
| '''Total COD inserted (kg/day)'''
 
−
| '''Total VSS inserted (kg/day)'''
 
−
| '''Total COD inserted (kg/day)'''
 
−
 
−
|-
 
−
| Month 1
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
 
−
|-
 
−
| Month 2
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
|
 
−
 
−
|-
 
−
| ...
 
−
|
 
−
|
 
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|
 
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|
 
−
|
 
−
|
 
−
 
−
|}
 
−
''Nomenclature''
 
−
 
−
CHP – Combined Heat and Power
 
−
 
−
COD – Chemical Oxygen Demand
 
−
 
−
HRT – Hydraulic Retention Time
 
−
 
−
OLR – Organic Loading Rate
 
−
 
−
OF-MSW – Organic Fraction of Municipal Solid Waste
 
−
 
−
PS – Primary Sludge
 
−
 
−
TSS – total Suspended Solids
 
−
 
−
VSS – Volatile Suspended Solids
 
−
 
−
WAS – Waste Activated Sludge
 
−
 
−
WWTP – Wastewater Treatment Plant
 

Revision as of 09:57, 15 July 2011

B3 - Test run
Batch digestion tests with controlled input
Calibration of COWS subsystem
Incremental optimisation of the full process
Test of operational limits
M - Validation of full scale COWS process
D5 - COWS performance report

Description and methods employed (what, how, where and when)

The main purpose of this action is to get:

  • optimal processing through the COWS pre-treatment prototype subsystem;
  • optimal overall performance of the plant

In order to achieve this goal adjustment and balancing of process parameters are to be done.

Adjustments of COWS pre-treatment prototype subsystem depend on the technology adopted; they are anyway similar in both cases of screw-press and piston-press (the most probable technologies). It would be different for hydro-mechanical separation.

We take as reference the extrusion process.

In order to evalute the performance of pre-treatment unit (COWS prototype) the presence of contaminants will be consider the principal factor. Tests include both chemical, physical, and ingredient analyses. The following contaminants/contrary materials are measured (relative to the organic fraction)

  • Putrescible
  • Plastics
  • Metals
  • Glass
  • Textiles
  • Wood
  • Paper
  • Inerts

Adjustments should consider the performance of each stage and the effects on subsequent steps. Characterization will be made at each step on residuals and in-flow materials, starting from influent OFMSW characterisation. Following steps are:

  • after pre-treatment, out of the press/screw system;
  • mixer content (floating, pulp precipitate, pulp outflow);
  • digester (fermentation values and digestate)
  • surnatants

Main process data monitored are:

  • Chemical composition of OFMSW and WAS influent (average monthly)
    • TS, g/kg
    • TVS, %TS
    • TCOD, mgO2/l
    • TKN, mgN/l
    • Ptot, mgP/kgTS
    • Alkalinity, mgCaCO3/l
    • pH
  • Operational conditions in the reactor
    • Feed caracteristics
      • Material
      • TS feed, %
      • TVS feed, %TS
    • Operational conditions
      • OLR (kgTVS/m3reactor day)
      • HRT (days)
      • Digester temperature, °C
    • Process parameters
      • pH
      • Alkalinity (@pH 6), gCaCO3/l
      • Alkalinity (@pH 4), gCaCO3/l
      • Volatile fatty acids, mgCOD/l
      • TS reactor, %
      • TVS reactor, %TS
    • Yields
      • GP, m3biogas/twaste
      • GPR, m3biogas/m3reactor day
      • SGP, m3CH4/kgTVSfeed
      • SGPsludge, m3CH4/kgTVSfeed
      • SGPofmsw, m3CH4/kgTVSfeed
      • CH4, %
      • TVS removal, %


Foreseen adjustment of the prototype considering the case of extruder technology can be done acting mainly on the following:

  • extruder piston pressure (or cochlea speed);
  • distance between piston (or cochlea) and the head of extrusion chamber;
  • screen patterns (hole diameter and distribution).

While pressure regulation and feeding can be done continuously, changes in distance between piston and cylinder and subtitution of screens must be off-line, with mechanical operations.

Adjustments on mixer are about rotation speed and the height of suction pump.

Ajustments on digester are about


Constraints and assumptions

Indicate what may prevent you from implementing the action as planned and what will be done to address this risk. Please ensure that these constraints and assumptions are in line with those indicated on Form B5.

Beneficiary responsible for implementation

Please indicate which of the project's beneficiaries will be in charge of the implementation of each action. Should more than one beneficiary be implicated, please give full details of which beneficiary is responsible for what.

Expected results

Please indicate (preferably in bullet points) the quantified/measurable results/outputs from the action. Please indicate whether they will be used in other actions and how.

Indicators of progress

Please indicate how progress of this action will be measured. The descriptions may be accompanied by explanatory graphs, tables or pictures which may be included in the forms by using the “Pictures” check box.

Notes and References

<references />

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