| 剩余污泥厌氧发酵混合物提高低C/N污水处理效果 |
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| 引用本文： | 刘晔,王淑莹,袁悦,何岳兰,彭永臻.剩余污泥厌氧发酵混合物提高低C/N污水处理效果[J].农业工程学报,2016,32(8):206-211. |
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| 作者姓名： | 刘晔 王淑莹 袁悦 何岳兰 彭永臻 |
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| 作者单位： | 北京工业大学北京市污水脱氮除磷处理与过程控制工程技术研究中心，北京市水质科学与水环境恢复工程重点实验室，北京 100124 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项（2015ZX07218001）；北京市教委资助项目；北京工业大学第13届研究生科技基金（ykj-2014-10781） |
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| 摘 要： | 为了避免剩余污泥厌氧发酵液利用时泥液难分离的问题,探讨了直接将发酵混合物用作外加碳源处理低碳氮比(C/N)污水的可行性。为此,首先对比了酸性(pH值=4.0±0.2)、中性(不控pH值)、碱性(pH值=10.0±0.2)条件下长期运行的剩余污泥厌氧发酵混合物的特性;其次,分别考察了碱性厌氧发酵混合物的不同投加量(0、10、20、30、50、100、200 mL),在反硝化及释磷过程中的利用。结果表明:碱性条件下溶解性化学需氧量(soluble chemical oxygen demand,SCOD)和短链脂肪酸(short-chain fatty acids,SCFAs)产量要远高于酸性和中性条件的,其中C/N比和C/P比分别高达18.9和57.0,更适合作为外加碳源利用。反硝化过程中,当初始NO_3~--N=(15.0±0.5)mg/L时,最佳投加量为30 mL,此时NO_3~--N去除率为100%;释磷过程中,最佳投加量为20 mL,此时最大净释磷量为22.8 mg/L。剩余污泥碱性厌氧发酵混合物用作外加碳源是可行的,既解决了碳源不足及剩余污泥处理的双重问题,又简化了传统发酵液利用时泥液分离的操作步骤,适用于处理低C/N比乡镇生活污水。
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| 关 键 词： | 污水 污泥 发酵 C/N |
| 收稿时间： | 2015/9/19 0:00:00 |
| 修稿时间： | 2016/2/22 0:00:00 |
Anaerobic fermentation mixture from waste activated sludge under alkaline condition improving treatment effect of wastewater with low C/N |
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| Liu Ye,Wang Shuying,Yuan Yue,He Yuelan and Peng Yongzhen.Anaerobic fermentation mixture from waste activated sludge under alkaline condition improving treatment effect of wastewater with low C/N[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(8):206-211. |
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| Authors: | Liu Ye Wang Shuying Yuan Yue He Yuelan and Peng Yongzhen |
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| Institution: | Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China,Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China,Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China,Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China and Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | Direct discharging of high nitrogen and phosphorus concentration wastewater can bring serious eutrophication to the environment. The activated sludge process has been widely used for solving this problem. However, the process exhibits poor removal of nitrogen and phosphorus due to the shortage of carbon source, and also produces a lot of waste activated sludge (WAS) which needed to be treated and disposed. On the basis of these considerations above, anaerobic fermentation of WAS and fermentation liquid utilization processes were developed. However, fermentation liquid separation from fermented sludge was difficult and had high energy consumption. To avoid the problem of liquid-solid separation difficulty involved in traditional WAS anaerobic fermentation liquid utilization process, the feasibility of using fermentation mixture directly as external carbon source for nitrogen and phosphorus removal of wastewater treatment was discussed. Firstly, the characteristics of anaerobic fermentation mixture under the acidic (pH value of 4), neutral (pH value uncontrolled) and alkaline (pH value of 10) conditions over 90 days were compared. Secondly, biological denitrification and biological phosphorus removal processes by adding alkaline fermentation mixture of different volumes were investigated. A set ofsequencing batch reactors (SBR) were respectively fed with 0.5 L seed sludge and 0.5 L wastewater, and then alkaline fermentation mixture of 0, 10, 20, 30, 50, 100 and 200 mL were added into the 7 reactors. The feasibility of using anaerobic fermentation mixture from WAS under alkaline condition as external carbon source was indicated by nitrate nitrogen (NO3--N) removal efficiency and pure phosphorus release amount.Meanwhile, the influence of ammonia (NH4+-N) concentration on biological nitrification process was analyzed. The results indicated that: 1) Alkaline fermentation mixture showed the best merit of reusable carbon source, with soluble chemical oxygen demand (SCOD) reaching 3428.5 mg/L corresponded to short chain fatty acids (SCFAs) accumulation of 1521.4 mg COD/L. Meanwhile, a small amount of nitrogen (C/N=18.9) and phosphorus (C/P=57.0) was released during alkaline fermentation. 2) The NO3--N removal efficiency was 69.3% when the initial NO3--N concentration was 15.0±0.5 mg/L and the maximum pure phosphorus release amount was 18.5 mg/Lin blank test. Compared with the blank test, the highest NO3--N removal efficiency (100%) occurred with the optimal additive volume of more than 30 mL in biological denitrification process. The maximum pure phosphorus release amount (22.8 mg/L) occurred with the optimal additive volume of 20 mL, 4.3 mg/L higher than that of blank test. However, excessive fermentation mixture could significantly reduce the nitrification rate. The highest NH4+-N removal rate was 0.293 mg/(L·min) with the optimal additive volume of 30 mL in biological nitrification process. When the additive volume was more than 30 mL (50, 100 and 200 mL), the NH4+-N removal rates were 0.244, 0.109 and 0.004 mg/(L·min), respectively. Therefore, the strategy using anaerobic fermentation mixture from WAS under alkaline condition as external carbon source is feasible. It can solve the problems of carbon source lack and WAS disposal, and also simplify the process of traditional WAS anaerobic fermentation liquid utilization. This strategy is suitable for the treatment of rural domestic wastewater with low C/N ratio. |
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| Keywords: | wastewater sludges fermentation C/N |
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