本文關(guān)鍵詞：基于硫自養(yǎng)反硝化的深度除磷脫氮研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 深度處理 異養(yǎng)反硝化 硫自養(yǎng)反硝化 除磷脫氮

【摘要】：近年來國家逐步提高污水處理廠出水水質(zhì)要求,地表IV類水標(biāo)準(zhǔn)成為污水廠排水標(biāo)準(zhǔn)的一種趨勢。因此,近年來對污水廠的出水采取進(jìn)一步的深度處理成為研究的熱點(diǎn)。本課題在考察異養(yǎng)反硝化深度脫氮的基礎(chǔ)上,重點(diǎn)研究了硫自養(yǎng)反硝化的脫氮效能,并進(jìn)行了成本分析,并探索了在硫自養(yǎng)反應(yīng)器中加入單質(zhì)鐵的強(qiáng)化除磷效果。異養(yǎng)反硝化填充床能夠進(jìn)行深度脫氮并達(dá)到地表水IV類水。以乙酸鈉為外加碳源,進(jìn)水NO_3~--N濃度為12.5 mg/L,在碳氮比(COD/NO_3~--N)=4.4,水力停留時間為0.5 h時,NO_3~--N和NO_2~--N的出水濃度均小于0.20 mg/L。但在COD/NO_3~--N=2.86(當(dāng)量比)的條件,隨著HRT的延長達(dá)到4 h,出水NO_3~--N濃度基本不變,為3.50 mg/L。若要達(dá)到深度脫氮的效果,則需投加額外COD,使C/N達(dá)到4.4,很容易導(dǎo)致出水COD超標(biāo)。硫自養(yǎng)反硝化能夠進(jìn)行深度脫氮并達(dá)到地表水IV類水。當(dāng)進(jìn)水NO_3~--N濃度為12.5 mg/L,水力停留時間為1 h時,出水NO_3~--N和NO_2~--N濃度均小于0.20 mg/L,硝氮的去除負(fù)荷與進(jìn)水硝氮負(fù)荷基本相等。在硫自養(yǎng)反硝化填充床的前30 cm處,硝氮的出水濃度為1.2 mg/L,去除率達(dá)到91%,硫自養(yǎng)反硝化具有脫氮快,效果好的優(yōu)點(diǎn)。硫自養(yǎng)反硝化同時具有去除少量TP和NH4+-N的效果。在硫自養(yǎng)反硝化系統(tǒng)中投加適量有機(jī)物有助于強(qiáng)化脫氮。出水硫酸鹽含量約為100 mg/L,低于國家規(guī)定值250 mg/L。假設(shè)二級生化出水NO_3~--N含量為12.5 mg/L左右,分別以異養(yǎng)反硝化和硫自養(yǎng)反硝化進(jìn)行深度脫氮達(dá)到地表水IV類水。異養(yǎng)反硝化(以乙酸鈉為例)的成本為0.1458元/t,硫自養(yǎng)反硝化的成本為0.046元/t。在硫自養(yǎng)反硝化系統(tǒng)中摻加鐵單質(zhì)后,能達(dá)到強(qiáng)化除磷的效果。在進(jìn)水NO_3~--N濃度為12.5 mg/L,TP為1 mg/L,水力停留時間為1 h時,加入單質(zhì)鐵之后,系統(tǒng)的出水TP平均值為0.10 mg/L。在硫自養(yǎng)反硝化系統(tǒng)中加入鐵單質(zhì)后脫氮效果有促進(jìn)作用,摻加鐵單質(zhì)前后的半級反應(yīng)速率常數(shù)分別為6.56和10.03 mg1/2/(L1/2·h),能夠強(qiáng)化硝氮向亞硝氮的轉(zhuǎn)化過程。
[Abstract]:In recent years, the country has gradually improved the water quality requirements of the sewage treatment plant, and the surface IV water standard of the surface has become a trend in the drainage standard of the sewage plant. Therefore, in recent years, the further treatment of effluent from the sewage plant has become a hot spot of research. On the basis of investigating the deep denitrification of heterotrophic denitrification, this study focused on the denitrification efficiency of sulfur autotrophic denitrification, and analyzed its cost, and explored the effect of enhanced phosphorus removal by adding elemental iron in sulfur autotrophic reactor. The heterotrophic denitrification packed bed can carry out deep denitrification and reach IV water in surface water. Taking sodium acetate as an external carbon source, when the influent NO_3~--N concentration is 12.5 mg/L, the effluent concentration of NO_3~--N and NO_2~--N is less than 0.20 mg/L when the ratio of carbon COD/NO_3~--N to nitrogen (COD/NO_3~--N) =4.4 and hydraulic retention time is 0.5 h. However, with the condition of COD/NO_3~--N=2.86 (equivalent ratio), with the extension of HRT up to 4 h, the concentration of NO_3~--N in the effluent is basically unchanged, which is 3.50 mg/L. In order to achieve the effect of deep denitrification, additional COD should be added to make C/N 4.4, which is very easy to lead to the exceeding the standard of the effluent COD. Sulphur autotrophic denitrification can carry out deep denitrification and reach IV water in surface water. When the influent NO_3~--N concentration is 12.5 mg/L and the hydraulic retention time is 1 h, the effluent NO_3~--N and NO_2~--N concentrations are all less than 0.20 mg/L, and the nitrate nitrogen removal load is basically equal to the nitrate nitrogen load. At the first 30 cm of the sulfur autotrophic denitrifying packed bed, the effluent concentration of nitrate nitrogen is 1.2 mg/L, and the removal rate is 91%. Sulfur autotrophic denitrification has the advantages of fast denitrification and good effect. Sulfur autotrophic denitrification also has the effect of removing a small amount of TP and NH4+-N. Adding a proper amount of organic matter to the sulfur autotrophic denitrification system helps to strengthen the denitrification. The sulfate content in the effluent is about 100 mg/L, which is lower than the national stipulated value of 250 mg/L. It is assumed that the NO_3~--N content of the two grade biochemical effluent is about 12.5 mg/L, and the depth denitrification by heterotrophic denitrification and autotrophic denitrification can reach IV water in the surface water respectively. The cost of heterotrophic denitrification (as an example of sodium acetate) is 0.1458 yuan /t, and the cost of autotrophic denitrification by sulfur is 0.046 yuan /t. After adding iron to the sulfur autotrophic denitrification system, the effect of enhanced phosphorus removal can be achieved. When the influent NO_3~--N concentration is 12.5 mg/L, TP is 1 mg/L, and the hydraulic retention time is 1 h, the average value of the effluent TP is 0.10 mg/L after adding the iron. The effect of nitrogen removal was promoted after adding iron matrix in sulfur autotrophic denitrification system. The rate constants of the half stage reaction were 6.56 and 10.03 mg1/2/ (L1/2. H), respectively, which could enhance the transformation process of nitrate nitrogen to nitrite.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703

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