印染工业园区污水厂提标改造关键技术中试研究

Pilot Testing of Key Technologies for Upgrading of a Wastewater Treatment Plant in a Printing and Dyeing Industrial Park

钱塘江流域某印染工业园区污水厂处理量为30×10^(4)m^(3)/d,具有水量大、水质变化大、工业废水比例高、B/C值低、处理难度大等特点,采用间歇膨胀水解+好氧+脱色混凝组合工艺对其进行处理,取得了理想效果。在进水COD为1084.2 mg/L、色度为173倍、TP为10.20 mg/L和NH_(3)-N为38.98 mg/L的条件下,出水COD达到95.3 mg/L、色度达到14.5倍、TP达到0.44 mg/L、NH_(3)-N达到11.52 mg/L,符合《污水综合排放标准》(GB 8978—1996)一级标准。间歇膨胀水解池对COD的去除率达到27.9%,B/C值增幅为11.2%,可生化性明显提高;可替代初沉池达到同样的COD去除效果,同时还具有停留时间短、污泥产量小等特点,污泥量约为现有系统的80.7%。新型脱色混凝剂的脱色率为79.6%,COD去除率为41.0%,替代传统混凝药剂具有更好的色度和COD去除效果。

The treatment capacity of a wastewater treatment plant in a printing and dyeing industrial park in the Qiantang River basin is 30×10^(4)m^(3)/d.The wastewater exhibits characteristics such as large flow rate,significant fluctuations in water quality,a substantial proportion of industrial wastewater,a low biochemical oxygen demand to chemical oxygen demand(B/C)ratio,and challenges in treatment.A combined process involving intermittent expansion hydrolysis,aerobic treatment and decolorization and coagulation was implemented for its treatment,yielding optimal results.Under the influent conditions of COD at 1084.2 mg/L,chroma at 173 times,total phosphorus(TP)at 10.20 mg/L,and ammonia nitrogen(NH_(3)-N)at 38.98 mg/L,the effluent COD,chroma,TP and NH_(3)-N was 95.3 mg/L,14.5 times,0.44 mg/L and 11.52 mg/L,respectively,complying with the classⅠlimit specified in Integrated Wastewater Discharge Standard(GB 8978-1996).The COD removal efficiency of theintermittent expansion hydrolysis tank reached 27.9%,while the B/C ratio increased by 11.2%,indicatinga significant enhancement in biodegradability.It could serve as a substitute for the primary sedimentationtank,achieving equivalent COD removal efficiency while exhibiting characteristics of reduced residencetime and minimal sludge production.The resulting sludge volume was approximately 80.7%of thatproduced by the existing system.The decolorization efficiency of the new decolorization coagulant was79.6%,while its COD removal efficiency was 41.0%.This new coagulant demonstrated superiorperformance in both chroma and COD reduction compared to traditional coagulants.