【摘要】：針對(duì)西安市第四污水處理廠二級(jí)生物處理出水難以穩(wěn)定達(dá)到一級(jí)A標(biāo)準(zhǔn)的問(wèn)題,本論文通過(guò)比選,確定其改造方案為投加懸浮填料強(qiáng)化生物處理工藝以及增加濾布濾池深度處理工藝,并重點(diǎn)研究其處理效能。通過(guò)懸浮填料強(qiáng)化生物處理和濾布濾池深度處理的中試試驗(yàn),研究添加懸浮填料對(duì)污水處理的強(qiáng)化效果以及增加濾布濾池后的深度處理效果;通過(guò)將中試試驗(yàn)成果應(yīng)用于西安市第四污水處理廠的提標(biāo)改造工程,研究懸浮填料強(qiáng)化工藝和濾布濾池深度處理工藝的實(shí)際運(yùn)行效果。懸浮填料強(qiáng)化生物處理和濾布濾池深度處理的中試試驗(yàn)表明:投加懸浮填料后可以顯著增強(qiáng)處理單元對(duì)NH_3-N和TN的去除效果,對(duì)COD,BOD_5,SS和TP的去除效果也有一定的提高作用。當(dāng)懸浮填料的填充率為30%、溶解氧濃度為3-4mg/L時(shí)試驗(yàn)效果最佳,對(duì)NH_3-N和TN的去除率分別可提高30%和50%。濾布濾池深度處理工藝可以顯著增強(qiáng)處理單元對(duì)TP和SS的去除效果,當(dāng)濾布濾池與輔助化學(xué)除磷相結(jié)合,并對(duì)除磷藥劑類型和投量進(jìn)行優(yōu)化可知:當(dāng)投加5mg/L的FeCl_2時(shí)效果最優(yōu),濾后水的TP和SS分別可降低30%和40%以上,對(duì)COD、BOD_5、NH_3-N和TN指標(biāo)也有10-20%的去除效果。濾后水穩(wěn)定達(dá)到一級(jí)A標(biāo)準(zhǔn)。將中試試驗(yàn)成果應(yīng)用于西安市第四污水處理廠的提標(biāo)改造工程,對(duì)其進(jìn)行6個(gè)月的長(zhǎng)期監(jiān)測(cè)結(jié)果表明:對(duì)比與原二級(jí)生物處理后出水,濾后出水的COD平均濃度為28.8 mg/L,降低了26.4%;出水SS平均濃度為5.59 mg/L,降低了52.1%;出水NH_3-N平均濃度為2.37mg/L,降低了22.0%;出水TN平均濃度為10.3mg/L,降低了30.9%;出水TP平均濃度為0.16mg/L,降低了69.2%。改造后各項(xiàng)指標(biāo)均穩(wěn)定達(dá)到了一級(jí)A標(biāo)準(zhǔn)。
[Abstract]:In view of the problem that the effluent from the secondary biological treatment of the fourth wastewater treatment plant in Xi'an is difficult to meet the first class A standard, this paper passes the comparison and selection. It was determined that the modification scheme was enhanced biological treatment process with suspended filler and advanced treatment process of filter cloth filter, and its treatment efficiency was studied emphatically. Through the pilot-scale experiment of biological treatment and advanced treatment of filter cloth filter, the effect of adding suspended filler on sewage treatment and the effect of advanced treatment after adding filter cloth filter were studied. By applying the results of the pilot test to the upgrading project of the fourth sewage treatment plant in Xi'an, the practical operation effect of the suspended filler strengthening process and the filter advanced treatment process was studied. The pilot-scale experiment of biological treatment and advanced treatment of filter with suspended filler showed that the removal efficiency of NH_3-N and TN could be significantly enhanced by adding suspending filler, and the removal efficiency of COD,BOD_5, could be improved by adding suspending filler. The removal efficiency of SS and TP is also improved. When the filling ratio of suspensions is 30 and the concentration of dissolved oxygen is 3-4mg/L, the experimental results are the best. The removal rates of NH_3-N and TN can be increased by 30% and 50% respectively. The advanced treatment process of filter cloth filter can significantly enhance the removal effect of TP and SS by the treatment unit, when the filter cloth filter is combined with auxiliary chemical phosphorus removal, The optimization of the type and dosage of phosphorus remover showed that the optimal effect was obtained when FeCl_2 was added with 5mg/L, and the TP and SS of filtered water were reduced by 30% and 40% respectively. NH_3-N and TN also have 10-20% removal effect. The filtered water reaches the first A standard stably. The pilot test results were applied to the upgrading project of the fourth sewage treatment plant in Xi'an. The long-term monitoring results for 6 months showed that the average COD concentration of filtered effluent was 28.8 mg/L, compared with the original secondary biological treatment. 26.4% lower; The average concentration of effluent SS was 5.59 mg/L, the average concentration of effluent NH_3-N was 2.37 mg / L, decreased 22.0%, the average concentration of effluent TN was 10.3 mg / L, decreased 30.9mg / L; The average concentration of effluent TP was 0.16 mg / L, which decreased 69.2%. After the transformation, all the indexes are stable up to the first class A standard.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703

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