精对苯二甲酸生产废水处理与CO_(2)协同利用技术的实践与展望

Practice and prospect of purified terephthalic acid production wastewater treatment and CO_(2) co-utilization technology

在全球变暖的严峻形势和我国“双碳”目标的大背景下,本文提出了“化工废水处理与CO_(2)协同利用”概念,选择精对苯二甲酸(PTA)生产废水处理与CO_(2)协同利用生产微藻生物质,开展了实验室研究和为期124天的中试试验。实验结果表明,实现了PTA生产废水COD去除率达到92%以上,对CO_(2)(体积分数10%)捕集率达到93%以上,CO_(2)捕集强度为9~11kg/t废水。产生的剩余生物质通过热裂解处理,生物质热裂解率>95%。通过闭环的碳转化,利用体系处理,利用废水、气体和固体中的碳,实现了从“无用碳”到“可用碳”的转化,为化工企业的碳中和目标提供了新的思路。

Under the background of global warming and China’s“double carbon”goal,the concept of“chemical wastewater treatment and CO_(2) co-utilization”is proposed in this paper,and purified terephthalic acid(PTA)production wastewater treatment and CO_(2) co-utilization are selected to produce microalgal biomass.Laboratory study and pilot test lasted for 124 days are carried out.The experimental results show that the COD removal rate is more than 92%,the CO_(2)(10%volume fraction)capture rate is more than 93%,and the CO_(2) capture intensity was 9—11kg/t wastewater.The residual biomass is treated by pyrolysis,and the pyrolysis rate of biomass is>95%.A closed-loop carbon conversion and utilization system is applied to treat and utilize carbon in wastewater,gases and solids.The conversion from“useless carbon”to“usable carbon”is realized,which provided a new way for the goal of carbon neutralization in chemical enterprises.