English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The purpose of this research is to study the effect of Fe concentration as a trace metal on the quality and quantity of biogas produced from the fermentation of palm oil mill effluent (POME). Raw POME as feed was obtained from one of the palm oil mills belong to PTPN IV, other materials used were hydrochloric acid, sodium bicarbonate, and trace metals. Observed variables were volume of biogas, concentration of Fe in raw POME and biodigester, degradation rate of total solid (TS) and volatile solid (VS), M-Alkalinity, pH, H 2 S and CO 2 concentration in biogas at hydraulic retention time (HRT) 6 days. Before HRT of 6 days reached, initial trace metal compositions were 25.2 mg/L of Fe, 0.42 mg/L of Co, and 0.49 mg/L of Ni. After that, composition of trace metal were consisted only Co and Ni. The results showed that Fe as a trace metal did not affect the production or quantity of biogas. When Fe concentration reached over to 330 mg/L then concentration of CH 4 , total solid (TS) and volatile solid (VS) decreased. Moreover, the higher the Fe contents the smaller of H 2 S production. Fe content in POME from the same mill had different concentration, as the consequence biogas with different H 2 S concentrations were produced as well. Thus, Fe in the trace metals is no longer required if high concentration of Fe already existed in POME because it can reduce the formation of H 2 S. In addition, too high concentration of Fe in POME can be toxic for microorganism in the fermentation of biogas.

The Effect of Fe Concentration on the Quality and Quantity of Biogas Produced From Fermentation of Palm Oil Mill Effluent