Effects of Self-purification of River Water on Laundry Wastewater

[Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater. [Method] The effects of laundry wastewater on the contents of total nitrogen(TN), total phosphorus(TP), suspended solids(SS), chemical oxygen demand(COD) and linear alkylbenzene sulfonic acid(LAS) were studied in 7 rivers of Shaoxing City. [Result](1) The contents of TN, TP, SS, COD and LAS increased by 92%, 99%, 340%, 351% and 923%, respectively, at the discharging moment of laundry wastewater; and(2) the five pollutional indexes significantly decreased over time, and especially 2 h after the discharge of laundry wastewater, compared with former the discharge of laundry wastewater, the contents of TN, TP, COD and LAS increased by 6%, 11%, 9% and13%, respectively,while the contents of SS still increased by 76%, i.e., SS required a longer time to achieve self-purification. [Conclusion] Laundry wastewater has some influence on thequality of river water, and the self-purification function of river water could effectively remove pollutants.

曝气量对生物流化床处理丙烯酸丁酯废水的影响

采用生物流化床处理丙烯酸丁酯模拟废水,考察了曝气量对废水处理效果的影响。结果表明,随着曝气量的减小,反应器内氧化还原条件变化显著,氧化还原电位(ORP)和溶解氧(DO)浓度下降,对废水特征污染物丙烯酸和对甲基苯磺酸的降解产生显著影响。当ORP为-272～-106mV,DO浓度为0.36～0.93mg/L时,丙烯酸平均去除率在97%以上。当ORP为-245mV以下时,丙烯酸中间降解产物乙酸和丙酸在出水中的浓度显著升高,由ORP为-128～-106mV时的乙酸9.42mg/L,丙酸未检出,增加到ORP为-272～-245mV时的乙酸65.3mg/L,丙酸296.0mg/L。当ORP为-128～-106mV,DO浓度为0.70～0.93mg/L时,对甲基苯磺酸平均去除率达87%,当ORP降至-179mV以下,DO浓度降至0.53mg/L以下时,对甲基苯磺酸去除率降为20%～24%。当ORP从-128～-106mV降至-272～-245mV时,废水溶解性有机碳(DOC)平均去除率由89.9%降至46.1%。

大孔树脂NG-13处理含β-萘磺酸废水的研究

采用新型大孔吸附树脂NG-13,对2-萘酚生产过程中产生的高浓度含β-萘磺酸废水进行吸附处理。结果表明,经树脂吸附处理后,废水中β-萘磺酸质量浓度由8 500 mg/L降低为1 000 mg/L以下,β-萘磺酸回收率大于87%,树脂经脱附后可重复使用。该处理工艺投资少、运行稳定、操作简便且已实现工业化。