MAP-SBBR組合工藝處理污泥壓濾廢水的研究
發(fā)布時(shí)間：2018-07-26 15:41
【摘要】：污泥處理過程需要進(jìn)行污泥厭氧消化,厭氧消化后的污泥經(jīng)壓濾脫水處理后產(chǎn)生大量廢水,該種廢水氨氮濃度在500~1000mg/L,處理難度較大,不適宜直接進(jìn)行生化處理,需先進(jìn)行物化法預(yù)處理。高氨氮廢水的物化處理方法有磷酸銨鎂(MAP)沉淀法、吹脫法和離子交換法等,其中磷酸銨鎂沉淀法具有反應(yīng)快,操作簡(jiǎn)單,無二次污染等優(yōu)點(diǎn),且產(chǎn)物可做肥料使用但MAP法存在沉淀劑成本過高的問題。為解決這個(gè)問題,本研究選用手機(jī)觸摸屏拋光時(shí)產(chǎn)生的廢磷酸作為MAP法磷源進(jìn)行試驗(yàn)。廢水經(jīng)MAP預(yù)處理后,可去除大量氨氮使氨氮濃度降到生化處理范圍內(nèi)(200mg/L以下)再進(jìn)行SBBR工藝處理,進(jìn)一步去除氨氮。為了使MAP-SBBR組合工藝的達(dá)到較好的處理效果,本文研究包括MAP的預(yù)處理試驗(yàn)和SBBR工藝運(yùn)行試驗(yàn)兩部分。具體研究?jī)?nèi)容包括:(1)MAP的預(yù)處理試驗(yàn):考察了磷源種類、鎂源種類、反應(yīng)時(shí)間、p H值、氮磷鎂比、初始氨氮濃度和靜置時(shí)間對(duì)氨氮去除效果和磷的殘余濃度的影響并確定最佳反應(yīng)條件,分析MAP處理成本。(2)SBBR工藝運(yùn)行試驗(yàn):以SBR反應(yīng)器作為對(duì)照,通過測(cè)定系統(tǒng)進(jìn)出水COD、氨氮、總磷、p H、亞硝氮和硝態(tài)氮濃度和總氮濃度來考察SBBR的廢水處理能力。本試驗(yàn)結(jié)果如下:(1)廢磷酸作為MAP沉淀劑磷源處理污泥壓濾廢水氨氮的效果與普通磷鹽相差不大。在常溫下,最優(yōu)的反應(yīng)條件是p H=9,氮鎂磷摩爾比為1:1:1,曝氣攪拌10min,氨氮的去除率可達(dá)84.91%,殘余磷濃度6.49mg/L,出水氨氮濃度低于200mg/L,有利于后續(xù)生化處理。(2)氯化鎂和硫酸鎂作為MAP鎂源的氨氮去除效果無明顯差別,而氧化鎂由于溶解度不高,在反應(yīng)時(shí)間較短的情況下,氨氮去除效果較差。MAP沉淀法去除氨氮的效果受反應(yīng)時(shí)間和靜置時(shí)間的影響較小,受p H和氮鎂磷比的影響較大。MAP處理前可進(jìn)行預(yù)曝氣處理提高壓濾廢水p H,減少后續(xù)調(diào)節(jié)p H所需藥劑,節(jié)省成本,實(shí)際生產(chǎn)中p H宜控制在9左右;氮鎂磷摩爾比控制在1:1:1既可以保持較好的氨氮去除率,又可保證較低殘余磷濃度;提高磷的投加量可提高氨氮的去除率,但出水中的殘余磷濃度也會(huì)提高;提高鎂的投加量有利于降低出水中磷的殘余磷濃度;同時(shí)減少磷鹽和鎂鹽的投加量與單獨(dú)減少磷鹽投加量相比,對(duì)氨氮的處理效果無明顯差別;在相同的p H和氮鎂磷摩爾比的條件下,廢水氨氮濃度越高,氨氮去除效率越高。(3)與SBR工藝相比,SBBR耐沖擊負(fù)荷能力較強(qiáng),氨氮處理效果穩(wěn)定,MAP-SBBR組合工藝運(yùn)行一個(gè)月出水氨氮平均濃度12.03mg/L,可達(dá)污水綜合排放標(biāo)準(zhǔn)(GB 8978-1996)二級(jí)標(biāo)準(zhǔn)。SBBR進(jìn)水氨氮濃度從145.00 mg/L到431.39mg/L,氨氮去除率保持在90%以上,最好時(shí)達(dá)99.89%。SBBR的COD去除率波動(dòng)較大,去除率在4.74%-64.49%之間。SBBR除磷效果較差,當(dāng)MAP預(yù)處理n(P):n(N):n(Mg)=0.9:1.0:1.0時(shí),SBBR出水磷濃度可達(dá)污水綜合排放標(biāo)準(zhǔn)(GB 8978-1996)三級(jí)標(biāo)準(zhǔn)。SBBR工藝中進(jìn)水氨氮濃度越高,越有利于亞硝態(tài)氮的積累,由于廢水生化性較差,碳氮比較低導(dǎo)致反硝化反應(yīng)受阻,TN去除效果較差且氨氮濃度較高時(shí),需補(bǔ)充堿度,維持正常的p H,保證氨氮的去除效果。綜上所述,本文利用廢磷酸作為MAP法的磷源處理污泥壓濾液厭氧出水中的氨氮是可行的。以廢磷酸為磷源的MAP沉淀法可使廢水氨氮濃度降低到200mg/L以下,同時(shí)引入磷元素,調(diào)節(jié)廢水碳氮磷比,為后續(xù)生物法處理創(chuàng)造有利條件。SBBR工藝有較好氨氮去除效果、操作簡(jiǎn)單、穩(wěn)定性好,SBBR出水氨氮濃度可達(dá)到綜合污水排放標(biāo)準(zhǔn)。該研究為污泥壓濾廢水的綜合處理提供了思路和指導(dǎo),有利于污泥處理行業(yè)的發(fā)展。
[Abstract]:Sludge anaerobic digestion is needed in the process of sludge treatment. The sludge after anaerobic digestion is treated by pressure filtration and dehydration to produce a large amount of wastewater. The concentration of ammonia nitrogen in this kind of wastewater is at 500~1000mg/L. It is difficult to deal with the wastewater. It is not suitable for direct biochemical treatment. It is necessary to pretreat the chemical process first. The method of physical and chemical treatment of high ammonia nitrogen wastewater has magnesium ammonium phosphate (MAP) precipitation. The precipitation method, blow off method and ion exchange method, of which ammonium phosphate precipitation method has the advantages of quick reaction, simple operation, no two pollution and so on, and the product can be used as fertilizer, but the cost of precipitant is too high in MAP method. In order to solve this problem, the waste phosphoric acid produced by the handset touch screen polishing is selected as the MAP phosphorus source. After MAP pretreatment, a large amount of ammonia nitrogen can be removed to reduce the concentration of ammonia to the biochemical treatment range (less than 200mg/L) and then be treated by SBBR process to further remove ammonia nitrogen. In order to make the MAP-SBBR combination process achieve better treatment effect, this study includes the two parts of the preconditioning test of MAP and the operation test of SBBR process. The contents include: (1) the pretreatment test of MAP: the type of phosphorus source, the type of magnesium source, the reaction time, the P H value, the ratio of nitrogen, phosphorus and magnesium, the effect of the initial ammonia nitrogen concentration and the stationary time on the removal efficiency of ammonia nitrogen and the residual concentration of phosphorus, and the determination of the optimum reaction conditions, and the analysis of the rational cost of the MAP. (2) the operation test of SBBR process: the SBR reactor is used as the control, By measuring the COD, ammonia nitrogen, total phosphorus, P H, nitrite nitrogen and nitrate nitrogen concentration and total nitrogen concentration, the wastewater treatment capacity of SBBR was investigated. The results are as follows: (1) the effect of waste phosphoric acid as a MAP precipitant phosphorus source to treat the ammonia nitrogen of the sludge pressure filter wastewater is not similar to that of the ordinary phosphorus salt. At normal temperature, the optimum reaction condition is p H=9, nitrogen The mmmmmmmmmmole ratio is 1:1:1 and aeration stirring 10min, the removal rate of ammonia nitrogen can reach 84.91%, the residual phosphorus concentration is 6.49mg/L, the concentration of ammonia nitrogen in the effluent is lower than 200mg/L, which is beneficial to the subsequent biochemical treatment. (2) the effect of magnesium chloride and Magnesium Sulfate as the MAP magnesium source has no obvious difference, while the solubility of Magnesium Oxide is not high and the reaction time is short. Under the poor removal efficiency of ammonia nitrogen, the effect of ammonia nitrogen removal by.MAP precipitation method is less affected by reaction time and static time. Under the influence of P H and nitrogen and magnesium phosphorus ratio, pre aeration can be used to improve the P H of filter wastewater before.MAP treatment, reduce the subsequent regulation of P H and save the adult version. In actual production, P H should be controlled at about 9; nitrogen and magnesium phosphorus The mole ratio control in 1:1:1 can not only maintain better ammonia nitrogen removal rate, but also guarantee lower residual phosphorus concentration; increasing the dosage of phosphorus can increase the removal rate of ammonia nitrogen, but the residual phosphorus concentration in the effluent will also be improved; the increase of the dosage of magnesium is beneficial to reducing the concentration of phosphorus in the effluent and reducing the amount of phosphorus salt and magnesium salt at the same time. There is no significant difference in the treatment effect of ammonia nitrogen alone. Under the same p H and MMP mole ratio, the higher the ammonia nitrogen concentration in the wastewater, the higher the ammonia nitrogen removal efficiency. (3) compared with the SBR process, the impact load capacity of SBBR is stronger, the ammonia nitrogen treatment is stable, and the MAP-SBBR combination process runs for one month of ammonia nitrogen. The average concentration of 12.03mg/L can reach the standard of wastewater discharge standard (GB 8978-1996) two grade standard.SBBR from 145 mg/L to 431.39mg/L, and the removal rate of ammonia nitrogen remains above 90%. The best COD removal rate of 99.89%.SBBR is fluctuating, and the removal rate is poor at 4.74%-64.49%. MAP pretreatment n (P) = = = = = = = = = = = = = = = = = 4.74%-64.49% = = = = = = MAP = = = = MAP = = = = = MAP = = = = = = = MAP = = = = = = = MAP = = = = = = = = = = = MAP = = = = = = = MAP = = = = = = MAP = = = = = = = MAP = = = = = = = = = = = = = = MAP = P) = When 0.9:1.0:1.0, the concentration of SBBR effluent can reach the standard of wastewater discharge standard (GB 8978-1996), the higher the concentration of ammonia nitrogen in the three grade standard process, the more beneficial to the accumulation of nitrite nitrogen. Because of the poor biochemical property of the wastewater, the lower carbon and nitrogen is hindered by the denitrification reaction, and when the TN removal effect is poor and the concentration of ammonia nitrogen is high, the alkalinity needs to be supplemented. In this paper, using waste phosphoric acid as the phosphorous source of the MAP method to treat the ammonia nitrogen in the anaerobic effluent of the sludge pressure filtrate is feasible. The MAP precipitation method with waste phosphoric acid as the phosphorus source can reduce the concentration of ammonia nitrogen to below 200mg/L with the waste phosphoric acid as the phosphorus source. At the same time, it can be introduced into the phosphorus element and adjust the carbon, nitrogen and phosphorus ratio of the waste water to the follow-up life. The process of material processing to create favorable conditions for.SBBR has better ammonia nitrogen removal effect, simple operation and good stability. The concentration of ammonia nitrogen in SBBR effluent can reach the standard of comprehensive sewage discharge. This study provides ideas and guidance for the comprehensive treatment of sludge pressure filtration wastewater, which is beneficial to the development of sludge treatment industry.
【學(xué)位授予單位】：華南農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X703
本文編號(hào)：2146487
[Abstract]:Sludge anaerobic digestion is needed in the process of sludge treatment. The sludge after anaerobic digestion is treated by pressure filtration and dehydration to produce a large amount of wastewater. The concentration of ammonia nitrogen in this kind of wastewater is at 500~1000mg/L. It is difficult to deal with the wastewater. It is not suitable for direct biochemical treatment. It is necessary to pretreat the chemical process first. The method of physical and chemical treatment of high ammonia nitrogen wastewater has magnesium ammonium phosphate (MAP) precipitation. The precipitation method, blow off method and ion exchange method, of which ammonium phosphate precipitation method has the advantages of quick reaction, simple operation, no two pollution and so on, and the product can be used as fertilizer, but the cost of precipitant is too high in MAP method. In order to solve this problem, the waste phosphoric acid produced by the handset touch screen polishing is selected as the MAP phosphorus source. After MAP pretreatment, a large amount of ammonia nitrogen can be removed to reduce the concentration of ammonia to the biochemical treatment range (less than 200mg/L) and then be treated by SBBR process to further remove ammonia nitrogen. In order to make the MAP-SBBR combination process achieve better treatment effect, this study includes the two parts of the preconditioning test of MAP and the operation test of SBBR process. The contents include: (1) the pretreatment test of MAP: the type of phosphorus source, the type of magnesium source, the reaction time, the P H value, the ratio of nitrogen, phosphorus and magnesium, the effect of the initial ammonia nitrogen concentration and the stationary time on the removal efficiency of ammonia nitrogen and the residual concentration of phosphorus, and the determination of the optimum reaction conditions, and the analysis of the rational cost of the MAP. (2) the operation test of SBBR process: the SBR reactor is used as the control, By measuring the COD, ammonia nitrogen, total phosphorus, P H, nitrite nitrogen and nitrate nitrogen concentration and total nitrogen concentration, the wastewater treatment capacity of SBBR was investigated. The results are as follows: (1) the effect of waste phosphoric acid as a MAP precipitant phosphorus source to treat the ammonia nitrogen of the sludge pressure filter wastewater is not similar to that of the ordinary phosphorus salt. At normal temperature, the optimum reaction condition is p H=9, nitrogen The mmmmmmmmmmole ratio is 1:1:1 and aeration stirring 10min, the removal rate of ammonia nitrogen can reach 84.91%, the residual phosphorus concentration is 6.49mg/L, the concentration of ammonia nitrogen in the effluent is lower than 200mg/L, which is beneficial to the subsequent biochemical treatment. (2) the effect of magnesium chloride and Magnesium Sulfate as the MAP magnesium source has no obvious difference, while the solubility of Magnesium Oxide is not high and the reaction time is short. Under the poor removal efficiency of ammonia nitrogen, the effect of ammonia nitrogen removal by.MAP precipitation method is less affected by reaction time and static time. Under the influence of P H and nitrogen and magnesium phosphorus ratio, pre aeration can be used to improve the P H of filter wastewater before.MAP treatment, reduce the subsequent regulation of P H and save the adult version. In actual production, P H should be controlled at about 9; nitrogen and magnesium phosphorus The mole ratio control in 1:1:1 can not only maintain better ammonia nitrogen removal rate, but also guarantee lower residual phosphorus concentration; increasing the dosage of phosphorus can increase the removal rate of ammonia nitrogen, but the residual phosphorus concentration in the effluent will also be improved; the increase of the dosage of magnesium is beneficial to reducing the concentration of phosphorus in the effluent and reducing the amount of phosphorus salt and magnesium salt at the same time. There is no significant difference in the treatment effect of ammonia nitrogen alone. Under the same p H and MMP mole ratio, the higher the ammonia nitrogen concentration in the wastewater, the higher the ammonia nitrogen removal efficiency. (3) compared with the SBR process, the impact load capacity of SBBR is stronger, the ammonia nitrogen treatment is stable, and the MAP-SBBR combination process runs for one month of ammonia nitrogen. The average concentration of 12.03mg/L can reach the standard of wastewater discharge standard (GB 8978-1996) two grade standard.SBBR from 145 mg/L to 431.39mg/L, and the removal rate of ammonia nitrogen remains above 90%. The best COD removal rate of 99.89%.SBBR is fluctuating, and the removal rate is poor at 4.74%-64.49%. MAP pretreatment n (P) = = = = = = = = = = = = = = = = = 4.74%-64.49% = = = = = = MAP = = = = MAP = = = = = MAP = = = = = = = MAP = = = = = = = MAP = = = = = = = = = = = MAP = = = = = = = MAP = = = = = = MAP = = = = = = = MAP = = = = = = = = = = = = = = MAP = P) = When 0.9:1.0:1.0, the concentration of SBBR effluent can reach the standard of wastewater discharge standard (GB 8978-1996), the higher the concentration of ammonia nitrogen in the three grade standard process, the more beneficial to the accumulation of nitrite nitrogen. Because of the poor biochemical property of the wastewater, the lower carbon and nitrogen is hindered by the denitrification reaction, and when the TN removal effect is poor and the concentration of ammonia nitrogen is high, the alkalinity needs to be supplemented. In this paper, using waste phosphoric acid as the phosphorous source of the MAP method to treat the ammonia nitrogen in the anaerobic effluent of the sludge pressure filtrate is feasible. The MAP precipitation method with waste phosphoric acid as the phosphorus source can reduce the concentration of ammonia nitrogen to below 200mg/L with the waste phosphoric acid as the phosphorus source. At the same time, it can be introduced into the phosphorus element and adjust the carbon, nitrogen and phosphorus ratio of the waste water to the follow-up life. The process of material processing to create favorable conditions for.SBBR has better ammonia nitrogen removal effect, simple operation and good stability. The concentration of ammonia nitrogen in SBBR effluent can reach the standard of comprehensive sewage discharge. This study provides ideas and guidance for the comprehensive treatment of sludge pressure filtration wastewater, which is beneficial to the development of sludge treatment industry.
【學(xué)位授予單位】：華南農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X703
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