Zero-discharge method for coke oven wastewater

Thread Content

Methods for zero discharge of coke oven wastewater: 1. Methods to eliminate coke oven wastewater involve using heat to evaporate all the remaining wastewater. A high-temperature spray dryer is employed to enable reaction between flue gas and wastewater in an atomized state, resulting in the complete vaporization of the wastewater; a small amount of the concentrated wastewater is then incinerated for decomposition. A combustion igniter is used to ignite the raw gas, while coke oven dust is introduced into the coal burning chamber for combustion, which yields an excellent effect in reducing smoke and dust. The high-temperature flue gas generated is then treated by spraying it with dilute ammonia water, whereby most of the dilute ammonia water evaporates into water vapor. The remaining ammonia water simplifies the treatment process, allowing it to be processed biologically or reused. 2. The “non-recycling coke oven” process is being used; currently, many such coke ovens have been built in China. Main advantages: (1) Simple coking process; (2) No wastewater or benzene, etc.; (3) A negative pressure exists inside the furnace during coking, so there is no significant leakage of dust; (4) Waste heat can be utilized to generate electricity; (5) Low initial investment, making it suitable for building independent coke plants; (6) The drawbacks are high energy consumption, poor quality of coke, and some residual waste gas pollution, but this method is advancing rapidly and holds great potential. Some companies have already converted all their old coke ovens into “non-recycling coke ovens” to achieve zero discharge of coke oven wastewater.