二次纤维造纸污水厌氧处理技术研究

发布时间：2018-12-27 17:38

【摘要】：广西某造纸厂二次纤维造纸废水CODCr为900～1010mg/L, BOD5为180～215 mg/L,总氮为2.75mg/L,总磷为0.75mg/L,色度为128倍,SS为250-350mg/L,pH为8.0-8.8,水质成分复杂,富含难降解有机污染物。本研究利用厌氧处理工艺处理该造纸废水,实验结果表明：(1)AF工艺处理该造纸废水的最佳运行条件是HRT为30h、pH为8.3、温度为35-C。当进水CODcr为975.7～984.5mg/L时,出水CODCr为540.0～559.1mg/L,平均去除率为44.1%；进水色度128倍,出水色度100倍,去除率为21.9%；对SS的去除率为92.9-94.6%。(2) UASB工艺处理该造纸废水的最佳运行条件是HRT为30h、pH为8.3、温度为35-C。当进水CODCr为975.7～984.5mg/L时,出水CODCr为405.4～452.4mg/L,平均去除率为55.2%；进水色度128倍,出水色度100倍,去除率为21.9%；对SS的去除率为91.4～93.4%。(3) EGSB工艺处理该造纸废水的最佳运行条件是HRT为30h、pH为8.3、温度为35-C、回流比为100%。当进水CODCr为947.5～984.5mg/L时,出水CODCr为312.5-346.1mg/L,平均去除率为65.3%；进水色度128倍,出水色度80倍去除率37.5%；对SS的去除率为91.6～92.996。(4)两段厌氧工艺的最佳运行条件是：第一段HRT为8h、pH为8.3；第二段HRT为30h、pH为8.3,温度为35℃,回流比为100%。当进水CODCr为940.8～982.1 mg/L时,出水CODCr为266.8～306.4mmg/L,平均去除率为70.7%；进水色度128倍,出水色度80倍,去除率37.5%；对SS的去除率为91.3%～93.9%。通过对各厌氧处理方案进行综合分析比较,两段厌氧工艺的出水CODcr能满足《造纸工业水污染物排放标准》(GB3544-2001)本色木浆的标准要求,是适合处理该造纸废水的厌氧工艺。
[Abstract]:The CODCr of the secondary fiber papermaking wastewater from a paper mill in Guangxi is 900mg / L, the BOD5 is 180 mg/L, the total nitrogen is 2.75 mg / L, the total phosphorus is 0.75 mg / L, the chroma is 128 times, the SS is 250-350 mg / L, the pH is 8.0-8.8. Water quality is complex and rich in refractory organic pollutants. The experimental results showed that: (1) the optimal operating conditions of AF process for the treatment of papermaking wastewater were as follows: HRT = 30 h pH = 8.3, temperature = 35-C; When the influent CODcr is 975.7~984.5mg/L, the effluent CODCr is 540.0559.1 mg / L, the average removal rate is 44.1, the influent chroma is 128 times, the effluent chroma is 100 times, the removal rate is 21.9g / L; The removal rate of SS is 92.9-94.6. (2) the optimal operating conditions for the treatment of papermaking wastewater by UASB process are as follows: HRT is 30 h, pH is 8.3, temperature is 35-C. When the influent CODCr is 975.7~984.5mg/L, the effluent CODCr is 405.4 mg / L, the average removal rate is 55.2%, the influent chroma is 128 times, the effluent chroma is 100 times, the removal rate is 21.9wt%. The removal rate of SS was 91.4% 93.4%. (3) the optimal operating conditions for the treatment of papermaking wastewater by EGSB process were as follows: HRT = 30 h, pH = 8.3, temperature = 35-C, reflux ratio = 100%. When the influent CODCr is 947.5~984.5mg/L, the effluent CODCr is 312.5-346.1 mg / L, the average removal rate is 65.30.The influent chroma is 128 times, the effluent chromaticity is 80 times, the removal rate is 37.5%. The removal rate of SS is 91.6 ~ 92.996. (4) the optimum operating conditions of two-stage anaerobic process are as follows: the first stage HRT is 8 h pH 8.3, the second stage 30 h HRT pH 8.3, the temperature 35 鈩，

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