PREPARATION OF PRELIMINARY DESIGN FOR HOMOGENIZATION OF STABILIZED SLUDGE – WWTP KUBRATOVO, QUARTER BENKOVSKI, TOWN OF SOFIA

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PREPARATION OF PRELIMINARY DESIGN FOR HOMOGENIZATION OF STABILIZED SLUDGE – WWTP KUBRATOVO, QUARTER BENKOVSKI, TOWN OF SOFIA

Employer/ Beneficiary: Sofiyska voda AD
Implementation period: 08/2018 – 11/2018

Design parameters:

  • Two existing sludge post-thickeners with (each of them with D = 40 m, H = 4,5 m, V = 5 000 m³), which are reconstructed and transformed into sludge silos with complete homogenization, according to the technical assignment;
  • Anaerobic stabilized sludge parameters:
    – Suspended solids 4÷7 %;
    – Organic compounds 50 %;
    – High fibrous content;
    – Residual biogas content.

Performed activities:

  • Survey of the existing situation and construction assessment of the existing reinforced concrete tanks;
  • Analysis of known methods for homogenization of stabilized sludge in accordance with best known practices and on the basis of parameters of stabilized sludge and on-site conditions – 7 options developed;
  • Options screening and selection of 5 basic options for more detailed evaluation, with data from different manufacturers;
  • Homogenization power analysis;
  • Analysis of the geometry of the tank and the optimal location of the intended equipment.
  • Presentation of the proposed design solutions and model studies;
  • Conceptual design of 2 of the selected options in all parts of the project;
  • Options comparison and recommendation for the choice of the final version;