1. Februar 2022
glow webteam
biosolids | Klärschlamm | Pflanzenkohle | Unkategorisiert

The waste­water asso­cia­tion Main-Taunus chooses a climate-protec­ting and cost-saving way to recycle phos­phorus from sewage sludge

With the PYREG PX 750, the Abwas­ser­ver­band Main-Taunus has commis­sioned the world­wide most advanced carbo­niz­a­tion and phos­phorus reco­very plant.

From now on, muni­cipal sewage sludge is sanitized and recy­cled into phos­phorus ferti­lizer on site in Lors­bach, a climate protec­ting and cost-saving manner.
In the applied PYREG process, the sewage sludge is first dried using the belt drying system from Eliquo Stulz and then carbo­nized by the PYREG reactor tempe­ra­ture of 500°C to 700°C. This carbo­niz­a­tion elimi­nates any organic pollut­ants such as critical phar­maceu­tical resi­dues, micro­plastics, PAH, PCDD/F, PCB and hormones. The resul­ting process gas is freed from dust and carbon parti­cles by a process gas filter and trans­ferred to the combus­tion chamber. Combus­tion takes place with a FLOX® burner at tempe­ra­tures of around 1,000 °C. The hot exhaust gases arising there heat the reac­tors indi­rectly via the outer shell of the reac­tors. It is there­fore an auto­thermal process and the gene­rated rene­wable energy is used for the drying of the sewage sludge.
The carbon contained in the sewage sludge is perma­nently bound in the gene­rated biochar from bioso­lids. Used as a phos­phorus ferti­lizer in agri­cul­ture that biochar closes the mate­rial cycle. And it further­more acts as a stable carbon sink for over 1000 years.
The PYREG PX 750 processes 5000 t of dewa­tered sewage sludge per year (or 16 t per day at 7500 opera­ting hours) with 25% dry matter, or 1250 t per year of dried sewage sludge. As a valu­able output, the asso­cia­tion gene­rates up to 625 t of biochar form bioso­lids per year with a phos­phorus content of about 15%.

With the commis­sio­ning of this plant, Abwas­ser­ver­band Main-Taunus is taking a resource-saving approach to the legally required reco­very of phos­phorus from sewage sludge. The goal is to use the reco­vered biochar form bioso­lids for agri­cul­tural purpose



2 Kommentare

  1. Dear ladies and gentlemen,
    The use of this mate­rial as a soil improver seems inte­res­ting, but I wonder how it relates to the release of heavy metals from the product into the soil. What are the criteria for the instal­la­tion and for its use as a fertiliser?
    Kind Regards,
    Chiel Landman
    HVC Groep

  2. Dear Mr. Landman,

    It will depend on the quality of the input mate­rial and its heavy metal concen­tra­tions, if the resul­ting Biochar product is passing the appli­cable heavy metals limits for its use. Those vary by appli­ca­tion and country.
    Addi­tio­nally, any organic pollut­ants (PFAS, phar­maceu­ti­cals, germs, micro­plastics, …) are comple­tely destroyed.
    The valu­able Phos­phorus remains plant avail­able is released slowly by the demand of the plant.
    We will be in touch shortly to discuss the details.
    Best Regards

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