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The results show that nano-porous membrane is efficient for treatment of petroleum refinery waste water, so that total suspended solids, total dissolved solids, oil and grease content and chemical and biochemical oxygen demand are increased to 100%, 44.4%, 99.9%, 80.3% and 76.9%, respectively.
On the other hand, the oil and grease content affects the wastewater biodegradability in the same way that the organic matter content expressed as chemical oxygen demand: the lower oil and grease and organic matter concentrations, the lower the percentage of wastewater biodegradability.
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COD, BOD, TSS, oil and grease contents were analyzed with standard method (APHA 2005) and presented as percent reduction.
The pretreated influent of the raw wastewater was high in suspended solid, but it was low in oil and grease contents.
The grease separator content was sampled.
For this reason, the grease separator content was analyzed as described above.
This time, the grease separator content from a particular restaurant was suspected to be the cause of the problems.
The aluminum concentration in the grease separator content was indeed much lower at a value of 1.42 mg/L.
Thus, it is very possible that the combination of these two components caused excessive foaming in the biogas plant BP B. The analyses of the suspicious grease separator content showed no abnormalities as compared to other substrate samples (Table 6).
Nevertheless, the analysis of the grease separator content, which was suspected to be a cause of foam formation, showed a slightly enhanced concentration of aluminum (1.42 mg/L) and zinc (10.5 mg/L).
In addition, grease separator contents were fed into one of the digesters (D3).
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CEO of Professional Science Editing for Scientists @ prosciediting.com