出口埃塞俄比亚污水处理设备项目
编辑：出口污水处理设备 来自：https://www.zqwscl.com /日期：2022-12-03 13:08 / 人气：
本项目是出口埃塞俄比亚五十处理设备项目，主要处理生活污水，处理水量为50T，处理工艺为AAO工艺，使用的设备是由中侨启迪生产的外贸出口一体化污水处理设备。
工艺说明：
AAO法又称A2O法，是英文Anaerobic-Anoxic-Oxic第一个字母的简称（厌氧-缺氧-好氧法），是一种常用的污水处理工艺，可用于二级污水处理或三级污水处理，以及中水回用，具有良好的脱氮除磷效果。通过厌氧过程使废水中的部分难降解有机物得以降解去除，进而改善废水的可生化性，并为后续的缺氧段提供适合于反硝化过程的碳源，最终达到高效去除COD、BOD、N、P 的目的。
影响AAO工艺的因素：
1、污水中可生物降解有机物对脱氮除磷的影响
厌氧段（C/P）：如果污水中能快速生物降解的有机物很少，厌氧段中聚磷菌则无法正常进行磷的释放，导致好氧段也不能更多地吸收磷。经实验研究，厌氧段进水溶解性磷与溶解性BOD5之比应小于0.06才会有较好的除磷效果。
缺氧段(C/N)：当污水中的BOD5浓度较高，又有充分的快速生物降解的溶解性有机物时，即污水中C/N比较高，此时NO3-N的的反硝化速率最大，缺氧段的水力停留时间HRT为0.5-1.0h即可；如果C/N较低时，脱氮率不高，需要补充碳源。一般来说，污水中BOD/TKN大于4时，氮的总去除率可达80%。
2、污泥龄Өc的影响
污泥龄：生物反应池内活性污泥总量与每天排放污泥量的比值。
一方面，自养型硝化菌增值速度小，要使硝化细菌存活并成为优势菌群,则污泥龄要长,经试验证明一般为20~30d为宜；另一方面，除磷主要是通过泥实现的，如果时间过长,则每天排出的含磷污泥量太小,达不到高的除磷效率,而过高的污泥龄会造成磷从污泥中重新释放,更降低了除磷效率。所以，权衡这两个方面，A2/O工艺中的Өc一般为15~20d。
3、溶解氧（DO）的影响
好氧段，DO升高，NH4+-N的硝化速度会随之加快。
但是，DO并非越高越好。因为好氧段DO过高，则溶解氧会随污泥回流和混合液回流带至厌氧段与缺氧段，造成厌氧段厌氧不完全，而影响聚磷菌的释放和缺氧段的NO3-N的反硝化。所以好氧段的DO应为2mg·L-1左右。太高太低都不利。
对于厌氧段和缺氧段，则DO越低越好，但由于回流和进水的影响，应保证厌氧段DO小于0.2mg·L-1，缺氧段DO小于0.5mg·L-1。
4、污泥负荷Ns的影响
在好氧池，Ns应在0.18 kg BOD5/（kgMLSS·d）之下，否则异养菌数量会大大超过硝化菌，使硝化反应受到抑制。而在厌氧池，Ns应大于0.10 kg BOD5/(kgMLSS·d），否则除磷效果将急剧下降。
所以，在A2/O工艺中其污泥负荷率Ns的范围狭小。
5、KN/MLSS悬浮固体浓度负荷率的影响
过高浓度的NH4+-N对硝化菌会产生抑制作用，所以KN/MLSS负荷率应小于0.05kg KN/（kgMLSS·d），否则会影响NH4+-N的硝化。
6、污泥回流比和混合液回流比
脱氮效果与混合液回流比有很大关系，回流比高，则效果好，但动力费用增大，反之亦然。A2/O工艺适宜的混合液回流比一般为200%。
一般，污泥回流比为25%-100%，太高，污泥将带入厌氧池太多DO和硝态氧，影响其厌氧状态（DO<0.2mg·L-1），使释磷不利；如果太低，则维持不了正常的反应池内污泥浓度2500-3500 mg·L-1，影响生化反应速率。
以上就是中侨启迪出口埃塞俄比亚污水处理设备的项目资料，如果您想外贸出口污水处理设备，可以联系中侨启迪的客服。
Project Overview:
This project is exported to Ethiopia 50 treatment equipment project, mainly treating domestic sewage, the treatment water is 50T, the treatment process is AAO process, the equipment used is the foreign trade export integrated sewage treatment equipment produced by ZhongQiaoqi.
description of the process:
AAO method, also known as A2O method, is the English first letter of Anaerobic-Anoxic-Oxic abbreviation (anaerobic-hypoxia-aerobic method), is a common sewage treatment process, can be used for secondary sewage treatment or tertiary sewage treatment, as well as reclaimed water reuse, with good nitrogen and phosphorus removal effect. Through the anaerobic process, part of the refractory organic matter in the wastewater can be degraded and removed, and then improve the biochemical properties of the wastewater, and provide carbon sources suitable for the subsequent denitrification process, and finally achieve the purpose of efficient removal of COD, BOD, N and P.
Factors affecting the AAO process:
1. The influence of biodegradable organic matter in sewage on nitrogen removal and phosphorus removal
Anaerobic section (C / P): if there is little organic matter in sewage, the polyphosphorus bacteria in the anaerobic section can not normally release phosphorus, resulting in the aerobic section can not absorb more phosphorus. After experimental study, the ratio of anaerobic segment water inlet dissolved phosphorus and dissolved BOD5 should be less than 0.06 to have a better phosphorus removal effect.
Hypoxic section (C / N): When the BOD5 concentration in sewage is high and there is sufficient rapidly biodegradable dissolved organic matter, C / N in sewage is relatively high, the denitrification rate of NO3-N is the largest, and the hydraulic retention time of the hypoxic section is HRT 0.5-1.0h; if C / N is low, the nitrogen removal rate is not high, so the carbon source is needed. In general, the total nitrogen removal rate can reach 80% when the BOD / TKN in the sewage is greater than
2. Effects of the sludge age, Ө c
Sludge age: the ratio of the total amount of activated sludge in the biological reaction tank to the amount of sludge discharged per day.
On the one hand, the value-added rate of autotrophic nitrification bacteria is small, to make the nitrification bacteria survive and become the dominant microflora, the sludge age should be long, after the test proved that generally 20~30d is appropriate;
On the other hand, phosphorus removal is mainly realized through mud. If the time is too long, the amount of phosphorus-containing sludge discharged every day is too small to reach the high phosphorus removal efficiency. The high sludge age will cause the re-release of phosphorus from the sludge, which reduces the phosphorus removal efficiency.
Therefore, weighing these two aspects, the Ө c in the A2 / O process is generally 15~20d.
3. Effect of dissolved oxygen (DO)
In the aerobic section, DO increases, and the nitrification speed of NH4 + -N will accelerate accordingly.
However, the higher the DO is not, the better. Because the DO of the aerobic section is too high, the dissolved oxygen will be brought to the anaerobic section and the hypoxic section along with the sludge reflux and the mixture reflux, resulting in the incomplete anaerobic section, and affecting the release of polyphosphobacteria and the denitrification of NO3-N in the hypoxic section. Therefore, the DO of the aerobic section should be about 2mg L-1. Too high and too low is not good.
For anaerobic and hypoxic segments, the lower DO is the better, but due to the influence of reflux and inflow, anaerobic DO is less than 0.2mg L-1, and hypoxia DO is less than 0.5mg L-1.
4. Impact of sludge load Ns
In the aerobic pool, the Ns should be at 0.18kg BOD5/（kgMLSS·d），Otherwise, the number of heterotrophic bacteria will greatly exceed the nitrification bacteria, so that the nitrification reaction is inhibited. In the anaerobic pool, Ns should be greater than 0.10 kg BOD5 / (kgMLSS d), otherwise the phosphorus removal effect will decrease sharply.
Therefore, the range of the sludge load rate Ns in the A2 / O process is narrow.
5. Effect of the concentration and load rate of KN/MLSS suspended solids
High concentration of NH4 + -N will inhibit nitrbacteria, so the KN/MLSS load rate should be less than 0.05kg KN / (kgMLSS d), otherwise the nitrification of NH4 + -N will be affected.
6. Sludge reflux ratio and mixture reflux ratio
The effect of nitrogen removal has a lot to do with the reflux ratio of the mixture, and the high reflux ratio has a good effect, but the power cost increases, and vice versa. The return ratio of the mixture suitable for the A2 / O process is generally 200%.
Generally, the sludge return ratio is 25% -100%, too high, the sludge will bring into too much DO and nitrate oxygen in the anaerobic tank, affect its anaerobic state (DO<0.2mg L-1), make phosphorus release adverse; if too low, can not maintain the normal sludge concentration in the reaction tank 2500-3500 mg L-1, affecting the biochemical reaction rate.
The above is the project information of Huaqiao Enlightenment exporting sewage treatment equipment in Ethiopia. If you want to export sewage treatment equipment, you can contact the customer service of Huaqiao exporting sewage treatment equipment.
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