Error message

  • Deprecated function: Return type of DatabaseStatementBase::execute($args = [], $options = []) should either be compatible with PDOStatement::execute(?array $params = null): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2244 of /vz/drupal/drupal-7.23/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /vz/drupal/drupal-7.23/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /vz/drupal/drupal-7.23/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /vz/drupal/drupal-7.23/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /vz/drupal/drupal-7.23/includes/database/database.inc).
  • Deprecated function: Return type of DatabaseStatementEmpty::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in require_once() (line 2346 of /vz/drupal/drupal-7.23/includes/database/database.inc).

SIDERWIN Team: Sevasti Koutsoupa and Stavroula Koutalidi

Submitted by monica.serna on 2021, June 1 - 10:07

Our colleagues Sevasti Koutsoupa and Stavroula Koutalidi from the National Technical University of Athens (NTUA) show in this interesting video https://youtu.be/cPZfal7I0-o, 

NTUA-Team

developed for the Hydrometec Learning Course 2021 supported by EIT Raw Materials, how they proceed for the electrochemical recovery of metallic iron from bauxite residue in aqueous alkaline solutions.