摘要：

研究分析了某钢厂蒸氨废水中的有机物组成、主要离子等,测定了该废水在近、超临界水体系中钠盐的溶解度,并采用不同吸附剂进行了脱盐预处理探索,最后对该废水进行了超临界水氧化处理。结果表明,焦化废水中以Na+为主的金属盐因为在水临界点附近溶解度急剧降低,可能在初始汽化阶段析出而造成装置堵塞;硅胶做吸附剂对钠盐的脱盐效果较好;在非催化超临界水氧化条件下,焦化废水中的有机组分可以得到完全转化,但氨氮的转化率低,引入催化剂,可使氨氮得以彻底去除。

关键词: 焦化废水, 超临界水氧化, 钠盐溶解度, 盐沉积

Abstract:

Organic components，and major ions in distilled ammonia wastewater from a steel works have been analyzed. The solubilities of sodium salt in the coking wastewater under near-critical and supercritical water conditions are determined. Different adsorbents are used for desalinating pretreatment. At the end，the wastewater is treated by supercritical water oxdition process. The results show that the metal salts in the coking wastewater,which mainly consists of Na⁺, could result in plugging in the device in the initial vaporization stage，because the solubility decreases sharply near the water cretical point. Silica gel as adsorbent has better desalinating effect on sodium salt.Organic components in coking wastewater could be completely converted , under non-catalytic supercritical water oxidation conditions , but the conversion rate of ammonia nitrogen is very low. However, ammonia nitrogen can be removed completely by adding catalyst.

Key words: coking wastewater, supercritical water oxidation, solubility of sodium salt, salt precipitation

中图分类号: 

• X703

• TQ085