印染废水生物处理工艺的影响因子探讨

Study on the influential factors of biological treatment of dyeing wastewater

以本源微生物菌为母菌接种于印染废水中,向改造后工艺复合生化池、接触氧化池中投加培养驯化后的复合微生物菌和生物铁填料,在稳定运行期研究了生物量、水力停留时间、溶解氧、pH、温度等因子对系统处理效果的影响,结果显示各控制因子的最佳值或范围是:在本源菌剂投加量为池有效容积的0.5%;水力停留时间复合生化池为38 h左右、接触氧化池为28 h左右;溶解氧启动初期为1.1～1.8 mg/L、稳定运行期为3.0～4.1 mg/L;调节池进水pH在9～10内;温度控制在35～38℃。在最佳处理条件下,排水口最终出水达标,出水色度13倍,去除率99.3%;出水COD 93 mg/L,去除率95.24%。

Origin microorganism bacteria, as mother bacterium, has been inoculated into dyeing wastewater. The domesticated compound microorganisms and biological iron filling are added into ameliorated compound biochemical pond and contact oxidation tank. During the steadily running period, the effects of some factors （biomass, hydraulic retention time, dissolved oxygen, pH and temperature） on the treatment efficiency are studied. The results reveal that the optimum value or range of the factors are as follows ： the origin microorganism bacteria added are 0.5% of the effective tank volume, hydraulic retention time for compound biochemical pond and contact oxidation tank are about 38 h and 28 h, respectively. DO is 1.1-1.8 mg/L at the starting stage, but 3.0-4.1 mg/L at steadily running stage. The pH of the inputted water of the regulating pond is in the range of 9-10, and the temperature is controlled 35-38 ℃. The quality of the dyeing wastewater after being treated under the optimized conditions reaches the stan- dard. The chroma and COD of effluent are 13 times and 93 mg/L respectively, and the removal of them are 99.3%, 95.24%.