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厭氧反映器的酸化景象與規復辦法!

時候:2020-02-26
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普通來講,對以產甲烷為首要目標的厭氧進程請求pH值在6.5~8.0之間,廢水堿度偏低或運轉負荷太高時,會引發反映器內揮發酸堆集,致使產甲烷菌活氣損失而產酸菌大批滋生,延續太久時,會致使產甲烷菌活氣損失殆盡而產乙酸菌大批滋生,引發反映器體系的“酸化”。嚴峻酸化產生后,反映器難以規復至原有狀況。
Generally speaking, for the anaerobic process with the main purpose of methanogenesis, the pH value is required to be between 6.5 and 8.0. When the wastewater alkalinity is low or the operation load is too high, it will cause the accumulation of volatile acid in the reactor, resulting in the loss of methanogenic bacteria activity and the proliferation of acidogenic bacteria. If it continues for too long, it will cause the loss of methanogenic bacteria activity and the proliferation of acetic acid producing bacteria, causing the degradation of the reactor system“ Acidification ". After serious acidification, it is difficult for the reactor to return to its original state.
“酸化”:①沼氣產量降落;②沼氣中甲烷含量降落;③消化液VFA增高;④無機物去除率降落;⑤消化液pH值降落;⑥碳酸鹽堿度與總堿度之間的差值較著增添;⑦洗出的顆粒污泥色彩變淺不光芒;⑧反映器出水產生較著異味;⑨ORP(氧化復原電位)值回升等。
"Acidification": ① decrease of biogas production; ② decrease of methane content in biogas; ③ increase of VFA in digested liquid; ④ decrease of organic matter removal rate; ⑤ decrease of pH value of digested liquid; ⑥ obvious increase of difference between carbonate alkalinity and total alkalinity; ⑦ lightening and tarnishing of washed granular sludge; Ⅷ obvious peculiar smell in reactor effluent; Ⅸ increase of ORP value, etc.
厭氧反映器酸化的緣由
Causes of acidification in anaerobic reactor
1、厭氧反映器超負荷運轉
1. Overload operation of anaerobic reactor
咱們都曉得,在運轉厭氧反映器的各項工藝節制前提中,污泥負荷是一個很是首要的節制參數。污泥負荷是指單元時候內施加給單元品質厭氧污泥的無機物的量,以kgSCOD/kgVS.d表現。對某種廢水,厭氧污泥具備一個限定值,當運轉的負荷跨越該限定值,則象征著超負荷運轉。
As we all know, sludge load is a very important control parameter in various process control conditions of anaerobic reactor. Sludge load refers to the amount of organic matter applied to anaerobic sludge per unit mass in unit time, expressed in kgscod / kgvs. D. For a certain wastewater, anaerobic sludge has a limit value. When the operating load exceeds the limit value, it means overload operation.
固然該限定值從污泥負荷的觀點上懂得是針對全部厭氧污泥,現實上真實的工具是針對厭氧污泥中的產甲烷菌。超負荷運轉,現實上便是負荷量跨越了厭氧污泥中產甲烷菌的產甲烷才能,而此時的負荷量常常并不跨越厭氧污泥的水解酸化才能。以是就呈現了反映器的VFA起頭積累,濃度不時回升,出水pH值降落,去除效力降落這類污泥酸化景象的產生。
Although the limit value from the concept of sludge load is for the whole anaerobic sludge, in fact, the real object is for methanogens in anaerobic sludge. In fact, overload operation means that the load exceeds the methanogenic capacity of methanogens in anaerobic sludge, while the load does not exceed the hydrolytic acidification capacity of anaerobic sludge. So the VFA of the reactor began to accumulate, the concentration increased, the pH value of the effluent decreased, and the removal efficiency decreased.
以是,領會厭氧反映器的污泥總量,并以此來保持公道的運轉負荷,是防備厭氧反映器呈現酸化的首要手腕之一。
Therefore, understanding the total amount of sludge in anaerobic reactor and maintaining reasonable operation load is one of the important means to prevent acidification in anaerobic reactor.
2、pH值、溫度等運轉節制前提呈現嚴峻誤差
2. Serious deviation occurred in pH value, temperature and other operation control conditions
由于厭氧污泥中產甲烷菌對其保存前提的請求比水解酸化菌刻薄的多,以是當反映器的pH值或溫度的節制規模呈現很大的誤差,就會使產甲烷菌的產甲烷才能遭到嚴峻影響,而水解酸化菌所遭到的影響卻遠遠小于產甲烷菌,其成果一樣會致使厭氧反映器產生酸化景象。
Because the requirements of anaerobic sludge methanogens on their living conditions are much more stringent than those of hydrolytic acidification bacteria, when the pH value or temperature control range of the reactor deviates greatly, the methanogenic ability of methanogens will be seriously affected, while the influence of hydrolytic acidification bacteria is far less than that of methanogens, which will also lead to the acidification of anaerobic reactor Elephant.
               厭氧反映器的酸化景象與規復辦法
3、毒性物資流入
3. Inflow of toxic substances
厭氧污泥比擬與好氧活性污泥,更輕易遭到毒性物資的按捺。和上述兩點所說明的一樣,現實上更輕易遭到毒性物資按捺的也是厭氧污泥中的產甲烷菌而非水解酸化菌。當廢水中含有某種或多種毒性物資,其濃度還缺少以嚴峻按捺厭氧污泥中的水解酸化菌時,產甲烷菌就已遭到按捺,污泥酸化景象就隨之產生。
Compared with aerobic activated sludge, anaerobic sludge is more easily inhibited by toxic substances. In fact, methanogens in anaerobic sludge are more susceptible to toxic substances than hydrolytic Acidifiers. When the wastewater contains some or more toxic substances, the concentration of which is not enough to seriously inhibit the hydrolysis acidification bacteria in anaerobic sludge, the methanogens have been inhibited, and the sludge acidification phenomenon will occur.
是以,應答污染源可以或許存在的毒性按捺物遏制排查,并成立污染物排放源和污水站之間的變亂排放傳遞機制,和潛伏的毒性物資平常監測機制,是避免此類厭氧反映器酸化變亂的有用應答辦法。
Therefore, it is an effective measure to investigate the toxic inhibitors that may exist in the pollution source, establish the accident discharge notification mechanism between the pollutant discharge source and the sewage station, and establish the daily monitoring mechanism of potential toxic substances.
4、養分鹽投加嚴峻缺少
4. There is a serious shortage of nutrients
對某些缺少諸如N、P或其余微量元素的廢水,投加充足的養分鹽很是須要。由于厭氧污泥中不管是產甲烷菌仍是水解酸化菌,都須要這些元素遏制推陳出新和分解細胞物資。
It is necessary to add enough nutrients to some waste water which lacks n, P or other trace elements. Both methanogens and hydrolytic Acidifiers need these elements to metabolize and synthesize cell substances in anaerobic sludge.
當廢水中的某種或多種養分元素缺少時,將會嚴峻影響產甲烷菌的活性。這是由于,對厭氧污泥,特別是厭氧顆粒污泥來講,產甲烷菌位于顆粒污泥的部位,水解酸化菌則包裹在產甲烷菌的核心,水解酸化菌較產甲烷菌更輕易取得這些元夙來遏制推陳出新,再加上水解酸化菌的生殖速度又遠遠高于產甲烷菌,使得廢水華夏本缺少的養分元素被水解酸化菌操縱殆盡,而產甲烷菌得不到這些須要的元素遏制性命勾當,其活性會遭到很大的按捺。其成果是,反映器的酸化不可避免。
The activity of methanogens will be seriously affected when one or more nutrients are deficient in wastewater. This is because for anaerobic sludge, especially for anaerobic granular sludge, methanogens are located in the center of granular sludge, while hydrolytic acidification bacteria are wrapped around methanogens. Hydrolytic acidification bacteria are more likely to obtain these elements for metabolism than methanogens. In addition, the reproductive rate of hydrolytic acidification bacteria is much higher than methanogens, which makes the waste water insufficient The nutrient elements are used up by hydrolytic acidification bacteria, but the activity of methanogens will be greatly inhibited if they can not get these essential elements for life activities. As a result, acidification of the reactor is inevitable.
酸化”規復辦法
Recovery measures of acidification
1、降落負荷
1. Reduce the load
反映器產生“酸化”的首要緣由是產甲烷菌被按捺,而厭氧反映器的容積負荷是由污泥負荷決議的,甲烷菌活性降落,間接反映了污泥負荷的降落。以是在產生“酸化”時應實時節制進水,情況嚴峻時應完整遏制進水。
The main reason of "acidification" is the inhibition of methanogens. The volume load of anaerobic reactor is determined by the sludge load. The decrease of methanogens activity directly reflects the decrease of sludge load. Therefore, the influent should be controlled in time when acidification occurs, and the influent should be stopped completely when the situation is serious.
2、投加堿度
2. Adding alkalinity
厭氧反映器“酸化”時,可以或許向反映器中投加堿度中和太高的VFA來保持pH值的不變,保障產甲烷菌的保存情況,避免嚴峻“酸化”。NaHCO3、Na2CO3、NaOH、Ca(OH)2等都是經常使用來調理堿度的化學藥劑,固然投加NaOH或Ca(OH)2等強堿性物資可以或許疾速進步反映器內的pH值,可是氫氧化物會耗損產甲烷進程中所需的CO2,粉碎產甲烷的遏制,對產甲烷菌的規復倒霉,是以不宜接納NaOH和Ca(OH)2。
When the anaerobic reactor is acidified, VFA with high alkalinity neutralization can be added to the reactor to maintain the stability of pH value, ensure the living environment of methanogens and prevent serious acidification. NaHCO3, Na2CO3, NaOH, Ca (OH) 2 are commonly used to adjust the alkalinity of the chemical agents. Although the addition of NaOH or Ca (OH) 2 and other strong alkaline substances can quickly improve the pH value in the reactor, but the hydroxide will consume the CO2 required in the process of methanogenesis, destroy the process of methanogenesis, and is not conducive to the recovery of methanogenic bacteria, so NaOH and Ca (OH) 2 should not be used.