6. Zero wastewater discharge technology-Yangzhou Jiaming Environmental Protection Technology Co., Ltd.

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6. Zero wastewater discharge technology

We have always been committed to the research and development and promotion of acid and environmental protection technologies. The developed zero-discharge wastewater technology, high-temperature cracking and recovery of refractory waste acid, high-arsenic ore treatment and arsenic recovery, and sulfur downstream product production technology have been widely used in the industry. The promotion and application of these technologies have enabled the project device to meet the strict national emission standards and also achieved the goal of energy saving and consumption reduction.

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Zero discharge technology of wastewater from sulfuric acid system

At present, in the domestic dry sulfuric acid production process, the purification section (unit) will produce a large amount of dilute sulfuric acid, which greatly increases the sewage costs of enterprises. At the same time, the absolute dry flue gas at the outlet of the sulfuric acid absorption tower will absorb a large amount of water when it is desulfurized, resulting in a large amount of water replenishment for the desulfurization tower. Sulfur dioxide in flue gas is removed by alkali liquor absorption and becomes sulfate. This has caused a lot of waste of resources, but also increased the processing costs of production enterprises. Due to the purification of dilute sulfuric acid concentration is not high, the current domestic basic lye neutralization. Or sent to the sewage treatment plant for centralized treatment.

Yangzhou Jiaming Company uses the dry sulfuric acid absorption tower of the dry sulfuric acid device to be heated, so that most of the wastewater water discharged from the dry sulfuric acid device becomes water vapor, and the sulfuric acid in the wastewater returns to the system, thus realizing zero discharge of wastewater in the system. The flue gas is also humidified and exhausted to the atmosphere.

The process reduces the amount of sewage in the sulfuric acid system and reduces the amount of makeup water in the desulfurization unit. Concentrated waste water and dilute sulfuric acid generated by tail gas recovery are returned to the system, which greatly saves resources and reduces the treatment cost of production enterprises. It has obvious environmental and economic benefits.

The attached drawing shows the process flow chart of zero discharge of wastewater in the dry sulfuric acid system.