Detail publikace

Development of a novel vacuum evaporator for liquid digestate treatment

VONDRA, M. KONEČNÁ, E. MÁŠA, V. TOUŠ, M.

Originální název

Development of a novel vacuum evaporator for liquid digestate treatment

Typ

abstrakt

Jazyk

angličtina

Originální abstrakt

Vacuum evaporation is a proven technology for a liquid digestate treatment with the advantage of simple construction, robust operation and waste heat utilization. Evaporators are capable of significant dewatering of the liquid digestate up to the 15 % of dry matter content (without a stirrer). However, high investment cost, chemicals consumption and utilization of subsidized and thus expensive electricity are the main obstacles for its expansion in the Czech Republic. To be acceptable for plant operators, beside price and reliability, a vacuum evaporator must meet all requirements for its product’s (concentrate, separated water) quality. Separated water should be purified enough so it could be directly discharged. The concentrate should contain most of original nutrients and must be usable as a fertilizer. To meet rising demand for feasible digestate treatment technology in the Czech Republic, a multi-stage flash (MSF) evaporator has been subjected to an extensive development, which is further described in this study. The reasons for the choice of the MSF evaporator are as follows: low energy consumption, good operational experience in the field of desalination, its simple construction, modularity and evaporation outside the heat transfer surface. The MSF prototype, which is currently under development, consists of three evaporation chambers and is capable of a stable liquid digestate flow rate (0.4–0.5 m3/h) and continuous distillate production (5 to 10 kg/h). In the full-scale projection, the evaporator should consume approx. 14 kWhel and 240 kWhth per m3 of the distillate produced. To reach the desired product’s quality, the MSF evaporator had to be supplemented by a system for ammonia degassing and absorption. This study presents obtained experimental results as well as future work, which will consists mainly of the technology optimization and investment cost reduction.

Klíčová slova

liquid digestate; vacuum evaporation; waste heat; anaerobic digestion; ammonia recovery

Autoři

VONDRA, M.; KONEČNÁ, E.; MÁŠA, V.; TOUŠ, M.

Vydáno

16. 10. 2018

Místo

Schwäbisch Hall, Deutschland

Strany od

49

Strany do

49

Strany počet

1

BibTex

@misc{BUT152212,
  author="Marek {Vondra} and Eva {Konečná} and Vítězslav {Máša} and Michal {Touš}",
  title="Development of a novel vacuum evaporator for liquid digestate treatment",
  booktitle="Progress in the treatment and application of manure and digestate products - Abstracts booklet",
  year="2018",
  pages="49--49",
  address="Schwäbisch Hall, Deutschland",
  note="abstract"
}