AD Plant Rothmühle

Short Project Description

The AD Plant Roth­müh­le treats 25.000 t/y of source sep­a­rat­ed organ­ics col­lect­ed main­ly from pri­vate house­holds. The waste is split into two frac­tions, a course frac­tion >100 mm with leave and yard waste going into a dry AD process and the fine frac­tion <100 mm going into the wet AD. Bio­gas of both sys­tems is col­lect­ed and used in sev­er­al CHP. Fin­ster­walder designed the wet AD and the inte­gra­tion of wet and dry AD. Fin­ster­walder deliv­ered all tech­ni­cal equip­ment and instal­la­tions and com­mis­sioned the sys­tem. Fin­ster­walder super­vised but was not con­tract­ed to serve the civ­il works.

Inte­grat­ed FIN­STER­WALDER Technology

  • 2x Sep­a­ra­tion Press BS20
  • 1x Dou­ble tube heat exchang­er pas­teur­iz­er system
  • 1x Dou­ble tube heat exchang­er con­t­a­m­i­nants heating
  • 2x Floor Scraper
  • 1x Sed­i­ment Sep­a­ra­tor SA05
  • 2x Skim­mer­sys­tem
  • 1x Dou­ble Pis­ton Pump KV20
  • Con­trol system

Overview

Waste Treat­ment Process

Flow Sheet in Detail

(1) RECEIV­ING BUNKER
The receiv­ing bunker has 200 m³ Vol­ume. The waste is trans­ferred into the pre-treat­ment by an auto­mat­ed crane system.
(2) PRE-TREAT­MENT AND CON­T­A­M­I­NANTS REMOVAL
Waste is shred­ed with stan­dard tech­nol­o­gy. The shred­ded waste is dis­trib­uted into two Fin­ster­walder BS20 Biosqueeze units. The reject is going to com­post­ing, the sub­strate pum­pet into the Fin­ster­walder Pas­teur­iz­er (Dou­ble tube heat exchanger).
(3) HEAT­ING WITH DOU­BLE TUBE HEAT EXCHANGER
The dou­ble tube heat exchang­er heats up the­sub­strate to about 75°C.
(4) PUMP­ING TECHNOLOGY
The sub­strate is deliv­ered into the digesters by a Fin­ster­walder KV20 Ball Valve Pump. Usu­al pump tech­nolo­gies are not suf­fi­cient because of high total solids con­tent (20 %), tem­per­a­tures of up to 85°C and amounts of abra­sive sand com­ing with the sub­strate. (up to 10 % of pump­ing volume)
FIN­STER­WALDER SED­I­MENT REMOVAL
In each digester a Fin­ster­walder BR13 Floorscraper is imple­ment­ed (5) . This moves all sol­id sed­i­ments into an exter­nal sed­i­ment trap . The sed­i­ment trap (6) is emp­tied in nec­es­sary cycles. Cur­rent­ly there are 8 t/d of sand removed from the digesters. (7) With­out sed­i­ment removal sys­tem the digesters would be filled with sand with­in 250 days of operation.
FIN­STER­WALDER SKIM­MER UNIT
In each of the digesters a skim­ming unit is imple­ment­ed. (8) The skim­mer removes up-swim­ming mate­r­i­al like fibers and plas­tic pieces that oth­er­wise would form a mat. The sep­a­ra­tion is done by an exter­nal siev­ing machine. (9) The sol­id drop out con­tains fibers but also all the plas­tic. (10)
(11) ENER­GY USE
The wet AD plant pro­duces about 250m²/h bio­gas, the dry AD about 125 m³/h. Both gas streams are stored togeth­er in a 9000 m³ dou­ble mem­brane gas stor­age above the end stor­age tank. Ener­gy gen­er­a­tion hap­pens in sev­er­al CHP units on site. With imple­men­ta­tion of the wet AD sys­tem 800kWel. pow­er have been installed.
(12) USE OF DIGESTATE
In each of the digesters a skim­ming unit is imple­ment­ed. (8) The skim­mer removes up-swim­ming mate­r­i­al like fibers and plas­tic pieces that oth­er­wise would form a mat. The sep­a­ra­tion is done by an exter­nal siev­ing machine. (9) The sol­id drop out con­tains fibers but also all the plas­tic. (10)
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