Eldyasti, Ahmed2018-03-012018-03-012017-08-012018-03-01http://hdl.handle.net/10315/34342Microorganisms metabolic rate is the ultimate operational basis of diverse biological treatment processes. A variety of assorted factors can affect the biological wastewater treatments metabolic rate. One of the prominent means, is the use of supplements such as trace metals and vitamins. Both batch and continuous experiments have been used to study the effect of a variety of trace metals solution (named biostreme solution) and vitamins solution on biological organic removal process. The results show that, in average addition of 500 ppm of the biostreme had the highest rate of organic removal. The colloidal removal was enhanced by a rate of between 65 to 75% in specific batch tests. When the wastewater was supplemented with concentrations of biostreme individually and in a mixture with the vitamins solution, chemical oxygen demand fractionation showed a significant decrease in the colloids, however there is a different effect observed when returned activated sludge was used as the seed.enAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.BiochemistryElectronic Thesis or Dissertation2018-03-01Wastewater treatmentBiological wastewater processesBiological organic removalAdditivesTrace metalsVitaminsBiostremeEnvironmental friendlySupplementation