Carbonera - SCENA

Carbonera - SCENA

 

SMARTech n 4a:

SCENA: Short-Cut Enhanced Nutrients Abatement

Objectives:

Biological nitrogen removal and P-bioaccumulation via-nitrite during the treatment of anaerobic supernatant

Challenges:

To enable the integration of conventional biogas recovery from sewage sludge with sidestream energy-efficient and compact nitrogen removal and phosphorus recovery.

Integration within WWTP:

Smartech 4a is implemented in the sidestream of the anarobic digester of Carbonera WWTP

Key enabling process(es):

Biotechnology

SMART-product(s):

 

P-rich Sludge, VFA

Partners involved:

1. University of Verona

2. Alto Trevigiano Servizi SpA

3. SCAE Srl

4. Università Politecnica delle Marche

DESCRIPTION:

SMARTech 4a applies the SCENA system which integrates the following processes: (o) optional upstream concentration of cellulosic sludge,(i) fermentation of dynamic thickened sewage sludge to produce VFAs as carbon source, and (ii) via nitrite nitrogen and phosphorus removal (by P-bioaccumulation) from sludge reject water using an SBR. In this configuration, nitrogen is removed through the bioprocesses of nitritation/denitritation, and Enhanced Biological Phosphorus removal (EBPR) via nitrite using the VFAs from sludge fermentation liquid as carbon source 

IMPACT:

The full-scale demo application developed in the WWTP of Carbonera (Italy) was treating the total flowrate of reject water resulted from the dewatering of the anaerobic digestate (around 40-50 m3/day). Smartech 5 allowed the recovery of 7-8 kg P-rich sludge per capita per year and the electrical energy savings of 20-30% for the treatment of sludge reject water.

Highlights and main results

  • Smartech 4a (SCENA) was validated under real enviromental conditions
  • Average and phosphorus removal was 78-80%, operating at vNLR up to 0.7 kgN/m3 per day
  • VFAs productivity was 0.9 kgCODVFA/capita per year, treating 25% of the sewage sludge
  • P recovered as P rich sludge was 0.8-1.0 kg P rich sludge per capita per year
  • ETV final report was delivered to RINA for the submission to the European portal

Impact

  • ATS has already considered the scale-up of SMARTech 4a in the final project design of the Castelfranco “Sludge Centre”.
  • Integration of SMARTech 4a in the sludge line of Sesto San Giovanni (SSG) and Robecco sul Naviglio (RSN) WWTPs, owned by the water utility CAP holding.

scena storage tank 1
scena storage tank 2
scena storage tank 3
scena storage tank 4
scena storage tank 5

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SMART-Plant scales-up in real environment eco-innovative and energy-efficient solutions to renovate existing wastewater treatment plants and close the circular value chain by applying low-carbon techniques to recover materials that are otherwise lost.

Seven plus two (7+2) pilot systems were optimized for more than two years in real environment in five municipal water treatment plants, including also two post-processing facilities. The systems were automatized with the aim of optimizing wastewater treatment, resource recovery, energy-efficiency and reduction of greenhouse emissions. A comprehensive SMART portfolio comprising biopolymers, cellulose, fertilizers and intermediates were recovered and processed up to the final commercializable end-products.

Dynamic modeling and superstructure framework for decision support was developed and validated to identify the optimum SMART-Plant system integration options for recovered resources and technologies.

The integration of resource recovery assets to system wide asset management programs were evaluated in each site following the resource recovery paradigm for the wastewater treatment plant of the future, enabled through SMART-Plant solutions. The project proved the feasibility of circular management of urban wastewater and environmental sustainability of the systems, through Life Cycle Assessment and Life Cycle Costing approaches as well as the global benefit of the scaled-up water solutions.

Global market deployment was achieved as right fit solution for water utilities and relevant industrial stakeholders, considering the strategic implications of the resource recovery paradigm in case of both public and private water management. New public-private partnership models were also explored connecting the water sector to the chemical industry and its downstream segments such as the construction and agricultural sector, thus generating new opportunities for funding and potential public-private competition.