科研之友
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摘要
A variety of solid-phase substances, including tar, sludge and salt, were produced during coking wastewater treatment process. These substances are pollutants, but also have the potential to be resources. At present, there is a lack of assessment on energy, economic and environmental aspects of solid-phase substances disposal technologies. In this study, the formation mechanism of three kinds of solid-phase substances was systematically proposed. A model for output calculation and treatment method evaluation was established. Taking the A/O/H/O (Anaerobic/Aerobic/Hydrolysis/Aerobic) fluidized bed process for coking wastewater treatment in Baowu Group Guangdong Shaoguan Iron & Steel Co., Ltd. as the research object, the actual production of solid-phase substances was estimated by using the engineering operation parameters and water quality statistical data. The yields of tar, inorganic sludge, biological sludge (moisture content is 80%) and salts were 0.186, 5.80, 4.24 and 1.97 kg?m-3, respectively. Based on the evaluation model, it was clear that tar incineration, sludge pyrolysis and salt purification and recovery were the best scheme for the disposal of solid-phase substances. In the disposal of solid-phase substances produced in a wastewater treatment plant with a treatment capacity of 60 m3?h-1, 1177 MWh energy might be generated annually, with an economic benefit of 1.35 million yuan and carbon dioxide emissions of 627.0 tons, showing the co-occurrence of energy recovery, economic benefits and environmental impact.
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