Abstract:

The carboxyl nitrile hard glue wastewater contains raw materials, by-products and some auxiliary materials that are not fully involved in the reaction, and has the characteristics of high chemical oxygen demand (COD), high mass concentration of Pull apart powder（BX）, high viscosity and toxicity, resulting in the poor operation of the water treatment process. The pretreatment process with "air flotation, membrane separation and ozone oxidation" as the core was adopted to remove COD and decoking powder from carboxyl nitrile hard adhesive wastewater, so as to improve the biodegradability of wastewater. This pretreatment process had problems such as rubber caking and blocking, filter device blocking and so on, and the overall operation effect was poor. The pretreatment process was improved by increasing the influent flow rate to 105 m³/h, increasing the chemical backwash time and backwash frequency, adjusting the ozone quality concentration to 35 mg/L, and decreasing the height of the packing layer of the ozone catalyst layer to 650 mm. The results show that when the effluent COD is stable at about 1 100 mg/L, the mass concentration of BX is maintained at about 40 mg/L, and BOD/COD (BOD is the ratio of biological oxygen demand) is about 0.30, the influent conditions of the subsequent process can be met, and the stable operation of the system can be ensured.

Key words: Rubber wastewater, Carboxybutyronitrile rubber, Ozone catalysis, Pull apart powder

摘要：

羧基丁腈硬胶废水中含有未完全参与反应的原材料、副产品及一些辅助材料，具有化学需氧量（COD）和拉开粉（BX）质量浓度高、黏性和毒性大等特点，导致水处理工艺运行不畅。采用以“气浮、膜分离和臭氧氧化”为核心的全物化预处理工艺，针对性地降低了羧基丁腈硬胶废水中COD和BX的质量浓度，以提高废水的可生化性。此预处理工艺在运行过程中出现了橡胶结块堵塞、过滤装置堵塞等问题，整体运行效果不佳。对预处理工艺进行改进，将进水流量加大至105 m³/h，增加了化学反洗时间及反洗频率，调整臭氧质量浓度为35 mg/L，将臭氧催化剂层填充高度降至650 mm。结果表明，当出水COD稳定在1 100 mg/L左右、BX质量浓度稳定在40 mg/L左右、BOD/COD约为0.30时（BOD为生化需氧量），可满足后续工艺的进水条件，保证系统稳定运行。

关键词: 橡胶废水, 羧基丁腈橡胶, 臭氧催化, 拉开粉