Coagulation/Flocculation Process for Oily Wastewater Treatment

Abstract

Oily wastewater is one of the most dangerous forms of environmental pollution, it is large amount of water that is wasted petrochemical industries, oily waste water contains oil, suspended solids, and dissolved solids. The study investigates the treatment of real oily waste water that was collected from al-Dura refinery (Iraq) /Middle Refineries Company from oil and suspended solid contamination for re-use and environmental consideration using coagulation and flocculation processes. Coagulation /flocculation is a common method used as primary purification processes to oily wastewater treatment due to its usability, performance, and low cost. Coagulation experiments were completed by the Jar Test device. The additives coagulants of ferric sulfate and aluminum sulfate were in a range about (10- 25) ppm, as well as polyelectrolyte- (polyacrylamide) as an additional flocculent in the range (1-4) ppm. The results show that ferric sulfate was more efficient in removing turbidity than Aluminum sulfate under the same conditions, with the best removal of turbidity at dose concentration 20 ppm of Ferric sulfate and a flocculent dose concentration of 3 ppm of polyacrylamide, also with oil content decreasing from 288 ppm to 14.4 ppm and the turbidity removal from 187 to 8.5 NTU.

Natural Biosorbent for Oil Adsorption from Produced Water by Sedge Cane

“…Free energy change values were negative to see if oil adsorption was impulsive and thermodynamically viable; however, when the temperature increased to (-0.217, -0.335, -0.489, and -0.599) KJ/mol, the G° readings dropped even further. At higher temperatures, specifically (30,40,50, and 60 °C), there is a strong driving force and correspondingly greater adsorption capacity. The positive value of H° (0.694 KJ/mol) served as evidence for the endothermic adsorption process.…”

“…Adsorbent dose 0.5, 1, 2, 3, 4 and 5 g, temperature 30, 40, 50 and 60 °C, used Water bath, model WNB, Memmert Company. The variables under investigation were contact duration (15,30,60,90, and 120 min) and rotational speed of the mixer (250 rpm) with a hot plate with a magnetic stirrer. The TD-500 examined the materials' oil concentration.…”

The Iraqi Petroleum Refining Industry: A Review of Environmental Impact Assessment

“…There are other skimmers at the bo om of the basin in which stagnant solids are collected after pre-treatment. Second, chemical treatment, chemicals such as alum or polyelectrolyte, which act as agglomerates of pollutants, are added on the basis of the formation of nuclei for these agglomerates [53]. Therefore, after the agglomeration of the pollutants, they are removed by making them float on the surface with the help of a stream of pressurized oxygen through special devices to release air bubbles, lifting the agglomerated particles to the surface and then removing them through scrapers.…”