Heavily polluted wastewater streams come in direct contact with petroleum fractions and require serious treatment processes for purification. Hydrocarbons such as aromatic compounds and heteroatoms can be found in wastewater streams from distillation and different forms of cracking. There is a set of quality parameters to measure the treatment required for the wastewater processes including amount of suspended solids, hydrocarbon content, nitrogen content, phenols content, and acidity. Municipal wastewater treatment cannot handle treating the pollutants because the different streams need to be kept separate to reduce the load on the treatment units. The wastewater treatment constitutes a very significant supporting process for safe operation. Most municipal wastewater treatment facilities can only handle cooling water and sanitary sewage water after it has had minor treatments. The amount of refinery equipment and treatment processes require expensive machinery as well as many units for the processes that municipals may not be able to afford. Primary treatments are physical whereas secondary treatments are biological processes. Primary treatment of sour water contaminated with oils and solid particles involve the stripped of dissolved H2S using steam, separators, and settling tanks. After primary treatments are conducted typically water can be sent to municipalities for further treatment processes because they are at a acceptable level for municipalities to handle. Secondary treatments utilize microorganisms to further remove organic contaminants.