Bicar­bon­ate tester BC16

LONG TERM PROCESS CON­TROL FOR BIO­GAS PLANTS – THE IMPOR­TANCE OF BICAR­BON­ATE PARA­ME­TER

For effi­cient bio­gas pro­duc­tion, sludge bac­te­ria require a pH-val­ue in the range of about 6.5 to 8. A sta­bi­liza­tion of the pH-val­ue in this area is main­ly achieved (> 85) by the bicar­bon­ate (= buffer sub­stance) released in large quan­ti­ties dur­ing anaer­o­bic degra­da­tion.

Process dis­tur­bances reg­u­lar­ly lead to increased lev­els of free fat­ty acids (FFA) or decreas­ing bicar­bon­ate lev­els, as the acids con­sume bicar­bon­ate. How­ev­er, due to the buffer­ing effect of the bicar­bon­ate the pH-val­ue is ini­tial­ly hard­ly reduced.

Only when the dis­tur­bance lasts for a long time and the stock of bicar­bon­ate is large­ly exhaust­ed, it comes to a rapid drop in pH-val­ue and sub­se­quent­ly to a reduc­tion or in extreme cas­es to a fail­ure of bio­gas pro­duc­tion.

ADVAN­TAGES OF A PROCESS CON­TROL WITH THE BICAR­BON­ATE TESTER

  • In con­trast to an exclu­sive pH val­ue check, process faults are detect­ed much ear­li­er – leav­ing more time to avoid eco­nom­ic loss­es
  • Very sim­ple oper­a­tion
  • Results after 5 min­utes!
  • Data is easy to inter­pret
  • Mea­sur­ing tech­nol­o­gy does not require cal­i­bra­tion
  • Very low con­sump­tion costs
  • Robust, long term proven mea­sure­ment tech­nol­o­gy

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