【摘要】：廣西某造紙廠二次纖維造紙廢水CODCr為900～1010mg/L, BOD5為180～215 mg/L,總氮為2.75mg/L,總磷為0.75mg/L,色度為128倍,SS為250-350mg/L,pH為8.0-8.8,水質(zhì)成分復(fù)雜,富含難降解有機(jī)污染物。本研究利用厭氧處理工藝處理該造紙廢水,實(shí)驗(yàn)結(jié)果表明：(1)AF工藝處理該造紙廢水的最佳運(yùn)行條件是HRT為30h、pH為8.3、溫度為35-C。當(dāng)進(jìn)水CODcr為975.7～984.5mg/L時(shí),出水CODCr為540.0～559.1mg/L,平均去除率為44.1%；進(jìn)水色度128倍,出水色度100倍,去除率為21.9%；對(duì)SS的去除率為92.9-94.6%。(2) UASB工藝處理該造紙廢水的最佳運(yùn)行條件是HRT為30h、pH為8.3、溫度為35-C。當(dāng)進(jìn)水CODCr為975.7～984.5mg/L時(shí),出水CODCr為405.4～452.4mg/L,平均去除率為55.2%；進(jìn)水色度128倍,出水色度100倍,去除率為21.9%；對(duì)SS的去除率為91.4～93.4%。(3) EGSB工藝處理該造紙廢水的最佳運(yùn)行條件是HRT為30h、pH為8.3、溫度為35-C、回流比為100%。當(dāng)進(jìn)水CODCr為947.5～984.5mg/L時(shí),出水CODCr為312.5-346.1mg/L,平均去除率為65.3%；進(jìn)水色度128倍,出水色度80倍去除率37.5%；對(duì)SS的去除率為91.6～92.996。(4)兩段厭氧工藝的最佳運(yùn)行條件是：第一段HRT為8h、pH為8.3；第二段HRT為30h、pH為8.3,溫度為35℃,回流比為100%。當(dāng)進(jìn)水CODCr為940.8～982.1 mg/L時(shí),出水CODCr為266.8～306.4mmg/L,平均去除率為70.7%；進(jìn)水色度128倍,出水色度80倍,去除率37.5%；對(duì)SS的去除率為91.3%～93.9%。通過對(duì)各厭氧處理方案進(jìn)行綜合分析比較,兩段厭氧工藝的出水CODcr能滿足《造紙工業(yè)水污染物排放標(biāo)準(zhǔn)》(GB3544-2001)本色木漿的標(biāo)準(zhǔn)要求,是適合處理該造紙廢水的厭氧工藝。
[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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