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Comment PDF Water Treatment

Purifying Coke-Cooling Wastewater

By Zhi-shan Bai, Shang-Tung Tu and Hua-lin Wang,  East China University of Science and Technology |

The delayed coking process is a fundamental part of the petroleum refining and petrochemical industries, and is among the main technical means for transforming inexpensive heavy oil into more valuable, light-oil products. Delayed coking units are common in petroleum refineries, and the process has been developed significantly as a heavy oil processing method in many countries, including China and the U.S. Figure 1. Typical coke-cooling wastewater treatment system. 1–coke drum; 2–gravity settling pit; 3–cooling tower; 4–hot coke-cooling water pump; 5–water storage tank; 6–high-pressure pump; 7–coke settling pit   The importance of delayed coking and its advanced development has not, however, eliminated certain disadvantages. The process uses high-sulfur heavy oil as its raw material, and requires a large amount of cooling water. This wastewater is referred to as “coke-cooling wastewater.” The large volume of wastewater produced by a delayed coking process at a typical petroleum refinery not only contains solid coke breeze (residue from screening heat-treated coke) and liquid heavy oil, but also contains organic and inorganic sulfides — all potential sources of environmental pollution. The problem…
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