CN116332452A - Method for in-situ inhibition of hydrogen sulfide production - Google Patents
Method for in-situ inhibition of hydrogen sulfide production Download PDFInfo
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Abstract
本发明涉及一种利用发酵液原位抑制硫化氢产生的方法。具体方法包括:取城市污水厂的污泥进行浓缩,提高污泥含固率;取污泥厌氧处理池中的厌氧发酵液进行处理,去除其中的SCFAs和溶解性磷等成分,然后储存待用;将所得到的浓缩污泥与处理后的发酵液以一定比例进行混合,通过对pH和温度的调控,对污泥基质进行预处理,最后,对污泥进行厌氧处理,通过控制污泥停留时间,维持反应器的连续流稳定运行。结果表明,基于此处理,能够极大的抑制污泥厌氧处理过程中硫化氢的产生。通过简单、便宜而有效的操作,利用污水厂副产物,实现以废治废,减少了污泥厌氧处理中硫化氢这种有毒有害气体的产生,对污泥的处理处置具有重要的意义。
The invention relates to a method for inhibiting the production of hydrogen sulfide in situ by using fermented liquid. The specific methods include: taking the sludge from the urban sewage plant for concentration to increase the solid content of the sludge; taking the anaerobic fermentation liquid in the sludge anaerobic treatment tank for treatment to remove SCFAs and soluble phosphorus and other components, and then storing Stand-by; mix the obtained concentrated sludge with the treated fermentation broth in a certain proportion, pretreat the sludge substrate by adjusting the pH and temperature, and finally perform anaerobic treatment on the sludge. The sludge residence time maintains the continuous flow of the reactor for stable operation. The results show that based on this treatment, the generation of hydrogen sulfide in the process of sludge anaerobic treatment can be greatly suppressed. Through simple, cheap and effective operation, the by-products of sewage plants are used to realize the treatment of waste with waste, which reduces the generation of toxic and harmful gases such as hydrogen sulfide in sludge anaerobic treatment, which is of great significance to the treatment and disposal of sludge.
Description
技术领域technical field
本发明属于环境保护以及污泥处理资源化技术领域,具体涉及一种污水处理厂原位减少污泥厌氧处理产生硫化氢的方法。The invention belongs to the technical field of environmental protection and sludge treatment and resource utilization, and in particular relates to a method for in-situ reduction of hydrogen sulfide produced by sludge anaerobic treatment in a sewage treatment plant.
技术背景technical background
为了处理日益增多的生活废水,我国城镇污水处理厂的数量快速增长,其中,大部分的污水处理厂都采用了活性污泥法来处理污水。因此,在实现污水达标排放的同时,不可避免地会造成大量初沉污泥和剩余污泥的产生。污泥数量的急剧增加造成了严重的环境问题,对它的处理处置成为亟待解决的问题。In order to deal with the increasing amount of domestic wastewater, the number of urban sewage treatment plants in my country has grown rapidly. Among them, most of the sewage treatment plants have adopted the activated sludge method to treat sewage. Therefore, while achieving the discharge of sewage up to the standard, it will inevitably result in the generation of a large amount of primary sludge and residual sludge. The sharp increase in the amount of sludge has caused serious environmental problems, and its treatment and disposal has become an urgent problem to be solved.
污泥中含有大量可利用的有机物如蛋白质、糖等有机物。而厌氧处理是一种目前普遍采用的污泥处理方式。厌氧处理,可以实现污泥的减量,减少污泥最终处置的费用;可以灭活污泥中的病原体等微生物,实现污泥的无害化,而且可以从污泥中回收大量的短链脂肪酸、氢气和甲烷等具有高附加值的产品,达到了以废制宝的效果,对于缓解目前的能源危机具有很大的作用。Sludge contains a large amount of available organic matter such as protein, sugar and other organic matter. Anaerobic treatment is a commonly used sludge treatment method. Anaerobic treatment can reduce the amount of sludge and reduce the cost of final disposal of sludge; it can inactivate microorganisms such as pathogens in sludge, realize the harmlessness of sludge, and can recover a large number of short chains from sludge Products with high added value such as fatty acids, hydrogen and methane have achieved the effect of turning waste into treasure, which has a great effect on alleviating the current energy crisis.
在污泥厌氧处理的过程中,微生物在降解有机物产生挥发性脂肪酸、氢气和甲烷等具有高附加值产品的同时,还会产生硫化氢。硫化氢是一种无色有臭鸡蛋气味的剧毒、易燃气体,有较强的腐蚀性,会腐蚀管道及其它设备,而且燃烧后会生成二氧化硫,污染大气环境。我国环保标准规定:利用沼气能源时,沼气中硫化氢的含量不得超过20mg/m3。沼气中H2S的质量浓度一般在1-12g/m3之间,远远高于我国环保标准的规定。沼气中的硫化氢直接影响了沼气的质量,从而限制了沼气的直接利用,降低了污泥厌氧处理产沼气的经济效益并阻碍了污泥厌氧处理的进一步推广。因此,很有必要寻找一种操作简便、安全便宜且高效的抑制污泥厌氧处理产生硫化氢的方法。In the process of sludge anaerobic treatment, microorganisms can produce hydrogen sulfide while degrading organic matter to produce high value-added products such as volatile fatty acids, hydrogen and methane. Hydrogen sulfide is a colorless, highly toxic and flammable gas with the smell of rotten eggs. It is highly corrosive and will corrode pipelines and other equipment. It will also generate sulfur dioxide after burning, polluting the atmosphere. China's environmental protection standards stipulate that when using biogas energy, the content of hydrogen sulfide in biogas shall not exceed 20mg/m 3 . The mass concentration of H 2 S in biogas is generally between 1-12g/m 3 , which is far higher than the provisions of China's environmental protection standards. The hydrogen sulfide in biogas directly affects the quality of biogas, which limits the direct utilization of biogas, reduces the economic benefits of sludge anaerobic treatment to produce biogas and hinders the further promotion of sludge anaerobic treatment. Therefore, it is necessary to find a simple, safe, cheap and efficient method to inhibit the production of hydrogen sulfide from sludge anaerobic treatment.
在现有的抑制污泥厌氧处理硫化氢产生的技术中,目前主要集中在添加各种化学药剂如高锰酸钾或者采用各种预处理方法如碱性预处理、热预处理的方法来抑制硫酸盐还原菌的活性,从而减少硫化氢的产生。例如,报道(文献Chemical Engineering Journal,2022,430,133150)将一定含量的高锰酸钾添加到剩余污泥中,发现其能显著降低污泥厌氧处理硫化氢气体的产生;专利号为CN201611213314.5的专利公开了一种“一种以碱性发酵促进高含固污泥厌氧消化产沼气及减少硫化氢含量的方法”,通过调节系统内pH,使高含固污泥初始pH=12,其后保持在35-37℃、pH=10、130转/分钟的厌氧条件下,进行碱性发酵10d,有效降低了硫化氢的产量。然而上述方法中存在不可避免的弊端,各种化学药剂或者预处理方法的使用,不可避免的增加了污水处理厂的运行成本,而且增加了污水处理过程中的间接碳排放量。随着全球资源能源危机的加剧以及应对全球气候变化背景下我国“双碳”目标的提出,开发经济、高效的原位抑制污泥处理硫化氢产生的方法显得尤为重要,也是目前污泥处理领域的研究重点。In the existing technologies for suppressing the production of hydrogen sulfide in anaerobic treatment of sludge, the main focus is on adding various chemicals such as potassium permanganate or using various pretreatment methods such as alkaline pretreatment and thermal pretreatment. Inhibits the activity of sulfate-reducing bacteria, thereby reducing the production of hydrogen sulfide. For example, it was reported (Chemical Engineering Journal, 2022, 430, 133150) that a certain amount of potassium permanganate was added to the excess sludge, and it was found that it could significantly reduce the generation of hydrogen sulfide gas in the anaerobic treatment of sludge; the patent number is CN201611213314 The patent of .5 discloses a kind of " a kind of method that promotes high-solid sludge anaerobic digestion to produce biogas and reduces hydrogen sulfide content method by alkaline fermentation ", by adjusting the pH in the system, make the initial pH of high-solid sludge = 12. Thereafter, the alkaline fermentation was carried out for 10 days under the anaerobic conditions of 35-37°C, pH=10, and 130 rpm, which effectively reduced the production of hydrogen sulfide. However, there are inevitable disadvantages in the above methods. The use of various chemical agents or pretreatment methods inevitably increases the operating cost of the sewage treatment plant and increases the indirect carbon emissions in the sewage treatment process. With the aggravation of the global resource and energy crisis and the proposal of my country's "double carbon" goal under the background of global climate change, it is particularly important to develop economical and efficient methods for in-situ suppression of hydrogen sulfide in sludge treatment, which is also the current sludge treatment field. research focus.
污泥发酵液在污水厂中广泛存在,其成分复杂,含有高浓度的氨氮、大量的厌氧微生物以及释放的各种有机或无机物质如蛋白质、多糖、腐殖质、木质纤维素、金属离子等。其中,高浓度氨氮、重金属离子的存在可能会对硫化氢产生微生物产生抑制作用(文献Bioresour Technol.2017,245,598-605;Bioresource Technol.2019,276,91-96),但与此同时,发酵液中富集的数量庞大、种类繁多的厌氧微生物(特别是水解微生物)会提高发酵系统中的功能微生物量,发酵液中残留的可生化有机物(如蛋白质等)随着厌氧发酵进程的推进不断的被降解,为后续硫化氢的生产提供额外的底物。发酵液中包含的厌氧微生物和可生化有机物可能会促进污泥厌氧处理过程中硫化氢的产生。实际发酵液成分的复杂性使得基于发酵液原位抑制污泥厌氧硫化氢产生的技术充满了不确定性。迄今为止,国内外尚未有研究团队开展“发酵液原位抑制污泥厌氧处理硫化氢产生”的相关研究。Sludge fermentation liquid widely exists in sewage plants, and its composition is complex, containing high concentrations of ammonia nitrogen, a large number of anaerobic microorganisms, and various organic or inorganic substances released such as proteins, polysaccharides, humus, lignocellulose, metal ions, etc. Among them, the presence of high concentrations of ammonia nitrogen and heavy metal ions may inhibit the production of hydrogen sulfide microorganisms (document Bioresour Technol.2017,245,598-605; Bioresource Technol.2019,276,91-96), but at the same time, The large number and variety of anaerobic microorganisms (especially hydrolytic microorganisms) enriched in the fermentation system will increase the functional microbial biomass in the fermentation system, and the residual biodegradable organic matter (such as protein, etc.) in the fermentation broth will increase with the advancement of the anaerobic fermentation process It is continuously degraded to provide additional substrates for the subsequent production of hydrogen sulfide. The anaerobic microorganisms and biodegradable organic matter contained in the fermentation broth may promote the production of hydrogen sulfide during the anaerobic treatment of sludge. The complexity of the actual fermentation broth components makes the technology based on fermentation broth in situ inhibition of sludge anaerobic hydrogen sulfide generation full of uncertainties. So far, no research team at home and abroad has carried out the relevant research on "in-situ inhibition of hydrogen sulfide production in sludge anaerobic treatment by fermentation broth".
鉴于以上问题的考量,本发明提供了一种利用污水厂污水污泥处理过程中产生的厌氧发酵液原位对污泥进行处理来抑制硫化氢的产生,达到了良好的抑制效果,利用污水处理副产物原位降低硫化氢的产生,一方面降低了化学药剂和能源的使用,极大的降低了处理的成本,另一方面,以废治废,为污泥发酵液的处理提供了新的思路,具有很强的实用性。In view of the considerations above, the present invention provides an in-situ treatment of sludge using anaerobic fermentation liquid produced in the sewage sludge treatment process of sewage plants to suppress the production of hydrogen sulfide, which achieves a good suppression effect. Treating by-products reduces the production of hydrogen sulfide in situ, on the one hand, reduces the use of chemicals and energy, and greatly reduces the cost of treatment; on the other hand, it provides a new way for the treatment of sludge fermentation liquid The idea is very practical.
发明内容Contents of the invention
本发明的目的在于提供一种原位抑制污泥处理过程中硫化氢产生的方法,即利用污水厂产生的副产物发酵液回流原位抑制污泥厌氧处理产生硫化氢。The object of the present invention is to provide an in-situ method for inhibiting the production of hydrogen sulfide in the process of sludge treatment, that is, using the by-product fermentation liquid produced by the sewage plant to backflow in situ to inhibit the production of hydrogen sulfide in the anaerobic treatment of sludge.
为了达到上述目的,本发明的方案为:In order to achieve the above object, the solution of the present invention is:
一种原位抑制硫化氢产生的方法,包括如下步骤:A method for suppressing the production of hydrogen sulfide in situ, comprising the steps of:
(1)取城市污水处理厂的初沉污泥和剩余污泥进行浓缩处理,提高污泥的含固率。(1) Concentrate the primary sludge and excess sludge from urban sewage treatment plants to increase the solid content of the sludge.
(2)发酵液来自污泥厌氧处理池,发酵液中包含了大量短链脂肪酸(SCFAs)和溶解性磷酸盐等成分,在利用发酵液处理污泥之前需要进行SCFAs和磷等成分的回收。具体方法如下:采用氢氧化钠溶液调节发酵液的pH值为7.8-11,然后按照钙磷摩尔比为1.5-2.1投加氯化钙溶液进行反应10-30分钟,过滤含有磷酸钙结晶的沉淀物。然后,通过吸附并储存微生物胞内多聚物PHA的方式对发酵液中的SCFAs等成分进行回收,反应在好氧条件下进行,好氧反应时间0.5-2h,污泥停留时间3天,温度20±1℃。(2) The fermentation broth comes from the sludge anaerobic treatment tank. The fermentation broth contains a large amount of short-chain fatty acids (SCFAs) and soluble phosphates. Before using the fermentation broth to treat sludge, SCFAs and phosphorus and other components need to be recovered. . The specific method is as follows: use sodium hydroxide solution to adjust the pH value of the fermentation broth to 7.8-11, then add calcium chloride solution to react for 10-30 minutes according to the calcium-phosphorus molar ratio of 1.5-2.1, and filter the precipitate containing calcium phosphate crystals things. Then, SCFAs and other components in the fermentation broth are recovered by adsorbing and storing the microbial intracellular polymer PHA. The reaction is carried out under aerobic conditions. The aerobic reaction time is 0.5-2h, and the sludge residence time is 3 days. 20±1°C.
(3)经过SCFAs和磷回收等处理后的发酵液储存在储存罐中,以备使用。(3) The fermented liquid after treatment such as SCFAs and phosphorus recovery is stored in a storage tank for use.
(4)从储存罐中取出经处理后的发酵液,按一定比例添加到待处理的基质(即(1)中浓缩后的污泥)中,控制发酵体系的pH和温度,对基质进行预处理一段时间。(4) Take out the treated fermentation broth from the storage tank, add it to the substrate to be treated (i.e. the concentrated sludge in (1)) in a certain proportion, control the pH and temperature of the fermentation system, and pre-process the substrate. Process for a while.
(5)预处理之后,对污泥基质充入氮气,维持反应器的厌氧密闭环境,不控制反应的pH,对污泥进行厌氧处理。(5) After pretreatment, nitrogen is filled into the sludge matrix to maintain the anaerobic closed environment of the reactor, and the sludge is anaerobically treated without controlling the pH of the reaction.
(6)污泥厌氧处理过程中,每天从反应器中取出一定含量的污泥厌氧处理混合物,并添加经过预处理之后的新的污泥基质,维持反应器的稳定运行,定期检测反应器中硫化氢的浓度,反应器在连续运行一段时间后,硫化氢的产量达到稳定。(6) In the process of sludge anaerobic treatment, a certain amount of sludge anaerobic treatment mixture is taken out from the reactor every day, and new sludge matrix after pretreatment is added to maintain the stable operation of the reactor, and the reaction is regularly detected. The concentration of hydrogen sulfide in the reactor, after a period of continuous operation of the reactor, the output of hydrogen sulfide reaches a stable level.
上述步骤(1)中污泥的总悬浮固体保持在20-30g/L的范围,作为基质。The total suspended solids of the sludge in the above step (1) is kept in the range of 20-30g/L as the matrix.
上述步骤(4)中体系的预处理pH控制为8.5,温度控制在室温(20℃),预处理时间为10小时,有效的减少了处理过程中的能源和药剂的消耗。The pretreatment pH of the system in the above step (4) is controlled at 8.5, the temperature is controlled at room temperature (20° C.), and the pretreatment time is 10 hours, which effectively reduces the consumption of energy and chemicals during the treatment process.
上述步骤(4)中所述的一定比例为控制发酵液体积与基质的体积比为10~30%。The certain ratio described in the above step (4) is to control the volume ratio of the fermentation broth volume to the substrate to be 10-30%.
上述步骤(6)中污泥的停留时间设置为10天,即每天取出的污泥厌氧处理混合物和添加的新的污泥基质体积为反应器中污泥的总体积/10。The residence time of the sludge in the above step (6) is set to 10 days, that is, the volume of the sludge anaerobic treatment mixture taken out every day and the new sludge matrix added is the total volume of the sludge in the reactor/10.
上述步骤(6)中污泥厌氧处理的条件为:温度20±1℃,震荡速度100rpm/min。The conditions for the sludge anaerobic treatment in the above step (6) are: temperature 20±1° C., shaking speed 100 rpm/min.
上述步骤(6)中所述的定期为每隔24h用气相色谱仪检测硫化氢气体的浓度。Described in the above-mentioned step (6) regularly is to detect the concentration of hydrogen sulfide gas with gas chromatography every 24h.
上述步骤(6)中所述的运行一段时间为6个月。The period of operation described in the above step (6) is 6 months.
本研究的创新点和优势在于:The innovations and advantages of this study lie in:
本发明利用污水处理厂中广泛存在的发酵液原位抑制污泥厌氧处理产生硫化氢,它能够显著抑制污泥厌氧处理中的硫酸盐还原菌,降低水解酶、氨基酸裂解酶等硫化氢产生微生物酶的活性,从而实现对硫化氢的抑制。与现有技术相比,本发明利用污水厂的处理副产物原位调控污泥处理,无需大量添加其他化学药剂或能源,大大降低了污水厂运行的成本,对实现污泥厌氧处理的大规模的应用具有重要的意义。本发明抑制了污泥厌氧处理中硫化氢这种有毒有害物质的产生,既减轻了对环境乃至人体的危害,又能够促进污泥厌氧处理这项技术安全有效的推广,对于污泥的减量和资源化具有重要的意义。The present invention utilizes the fermented liquid widely present in sewage treatment plants to in situ inhibit sludge anaerobic treatment to produce hydrogen sulfide, which can significantly inhibit sulfate-reducing bacteria in sludge anaerobic treatment and reduce hydrogen sulfide such as hydrolase and amino acid lyase Produce the activity of microbial enzymes, thereby achieving the inhibition of hydrogen sulfide. Compared with the prior art, the present invention utilizes the treatment by-products of the sewage plant to regulate the sludge treatment in situ, without adding a large amount of other chemicals or energy sources, greatly reducing the operating cost of the sewage plant, and greatly contributing to the realization of anaerobic sludge treatment. The application of scale is of great significance. The invention suppresses the production of toxic and harmful substances such as hydrogen sulfide in the anaerobic treatment of sludge, not only reduces the harm to the environment and the human body, but also promotes the safe and effective promotion of the technology of anaerobic treatment of sludge. Reduction and resource utilization are of great significance.
附图说明Description of drawings
图1为本发明的工艺流程图Fig. 1 is a process flow diagram of the present invention
具体实施方式Detailed ways
以下结合具体实际案例对本发明做进一步的描述,但并不限制本发明的保护范围。The present invention will be further described below in conjunction with specific practical cases, but the protection scope of the present invention will not be limited.
实施案例1Implementation Case 1
(1)基质的准备:在工作体积为100L的有机玻璃容器中,对城市污水处理厂产生的污泥进行浓缩处理(即在室温下自然沉淀,然后去除上清液),使得污泥的总悬浮固体为28.9g/L。(1) Preparation of matrix: In a plexiglass container with a working volume of 100L, the sludge produced by the municipal sewage treatment plant was concentrated (that is, naturally precipitated at room temperature, and then the supernatant was removed), so that the total amount of sludge Suspended solids were 28.9g/L.
(2)发酵液的准备与处理:首先,在工作体积为100L的有机玻璃容器中,加入50L取自城市污水处理厂污泥厌氧处理池的发酵液;然后对发酵液中原有的SCFAs和溶解性磷等成分进行回收处理,避免影响后续的实验,具体方法如下:采用氢氧化钠溶液调节发酵液的pH值为7.8-11,然后按照钙磷摩尔比为1.5-2.1投加氯化钙溶液进行反应10-30分钟,过滤含有磷酸钙结晶的沉淀物;然后,通过吸附并储存微生物胞内多聚物PHA的方式对发酵液中的SCFAs等成分进行回收,反应在好氧条件下进行,好氧反应时间0.5-2h,污泥停留时间3天,温度20±1℃。处理后得到的发酵液保存在体积为100L的储存罐中。(2) preparation and processing of fermented liquid: at first, in the plexiglass container that working volume is 100L, add 50L to be taken from the fermented liquid of urban sewage treatment plant sludge anaerobic treatment pond; Then original SCFAs and in fermented liquid Dissolved phosphorus and other components are recycled to avoid affecting subsequent experiments. The specific method is as follows: use sodium hydroxide solution to adjust the pH of the fermentation broth to 7.8-11, and then add calcium chloride according to the calcium-phosphorus molar ratio of 1.5-2.1 The solution is reacted for 10-30 minutes, and the precipitate containing calcium phosphate crystals is filtered; then, SCFAs and other components in the fermentation broth are recovered by adsorbing and storing the microbial intracellular polymer PHA, and the reaction is carried out under aerobic conditions , The aerobic reaction time is 0.5-2h, the sludge residence time is 3 days, and the temperature is 20±1°C. The fermented liquid obtained after treatment is stored in a storage tank with a volume of 100 L.
(3)预处理:将5L(1)中得到的污泥加入反应器中,并添加1.5L(2)中得到的发酵液(发酵液与污泥的体积比例为30%),控制处理温度为20℃,将pH控制为8.5并保持10小时。(3) Pretreatment: Add the sludge obtained in 5L (1) to the reactor, and add 1.5L of the fermented liquid obtained in (2) (the volume ratio of the fermented liquid to the sludge is 30%), and control the treatment temperature at 20°C, the pH was controlled to 8.5 and maintained for 10 hours.
(4)污泥厌氧处理:预处理结束后,往反应器中充入氮气,持续5min以去除氧气,密封反应器放入摇床进行厌氧处理,其中,摇床处理温度为20±1℃,震荡速度为100rpm/min,污泥的停留时间为10天,即每天需要从运行的反应器中取出0.65L污泥厌氧处理混合物,并添加0.65L(3)中预处理后的新污泥基质,反应器连续运行180天后,反应器中硫化氢的浓度达到稳定,硫化氢的浓度为13ppm。(4) Anaerobic treatment of sludge: After pretreatment, fill nitrogen into the reactor for 5 minutes to remove oxygen, seal the reactor and put it into a shaking table for anaerobic treatment, wherein the shaking table treatment temperature is 20 ± 1 ℃, the shaking speed is 100rpm/min, and the residence time of the sludge is 10 days, that is, 0.65L of sludge anaerobic treatment mixture needs to be taken out from the running reactor every day, and 0.65L (3) of pretreated new Sludge matrix, after 180 days of continuous operation of the reactor, the concentration of hydrogen sulfide in the reactor is stable, and the concentration of hydrogen sulfide is 13ppm.
实施案例2Implementation Case 2
(1)基质的准备:在工作体积为100L的有机玻璃容器中,对城市污水处理厂产生的污泥进行浓缩处理(即在室温下自然沉淀,然后去除上清液),使得污泥的总悬浮固体为28.9g/L。(1) Preparation of matrix: In a plexiglass container with a working volume of 100L, the sludge produced by the municipal sewage treatment plant was concentrated (that is, naturally precipitated at room temperature, and then the supernatant was removed), so that the total amount of sludge Suspended solids were 28.9g/L.
(2)发酵液的准备与处理:首先,在工作体积为100L的有机玻璃容器中,加入50L取自城市污水处理厂污泥厌氧处理池的发酵液;然后对发酵液中原有的SCFAs和溶解性磷等成分进行回收处理,避免影响后续的实验,具体方法如下:采用氢氧化钠溶液调节发酵液的pH值为7.8-11,然后按照钙磷摩尔比为1.5-2.1投加氯化钙溶液进行反应10-30分钟,过滤含有磷酸钙结晶的沉淀物;然后,通过吸附并储存微生物胞内多聚物PHA的方式对发酵液中的SCFAs等成分进行回收,反应在好氧条件下进行,好氧反应时间0.5-2h,污泥停留时间3天,温度20±1℃。处理后得到的发酵液保存在体积为100L的储存罐中。(2) preparation and processing of fermented liquid: at first, in the plexiglass container that working volume is 100L, add 50L to be taken from the fermented liquid of urban sewage treatment plant sludge anaerobic treatment pond; Then original SCFAs and in fermented liquid Dissolved phosphorus and other components are recycled to avoid affecting subsequent experiments. The specific method is as follows: use sodium hydroxide solution to adjust the pH of the fermentation broth to 7.8-11, and then add calcium chloride according to the calcium-phosphorus molar ratio of 1.5-2.1 The solution is reacted for 10-30 minutes, and the precipitate containing calcium phosphate crystals is filtered; then, SCFAs and other components in the fermentation broth are recovered by adsorbing and storing the microbial intracellular polymer PHA, and the reaction is carried out under aerobic conditions , The aerobic reaction time is 0.5-2h, the sludge residence time is 3 days, and the temperature is 20±1°C. The fermented liquid obtained after treatment is stored in a storage tank with a volume of 100 L.
(3)预处理:将5L(1)中得到的污泥加入反应器中,并添加0.5L(2)中得到的发酵液(发酵液与污泥的体积比例为10%)和1L的蒸馏水(保证总体积仍为6.5L),控制处理温度为20℃,将pH控制为8.5并保持10小时。(3) Pretreatment: Add 5L of the sludge obtained in (1) to the reactor, and add 0.5L of the fermented liquid obtained in (2) (the volume ratio of the fermented liquid to the sludge is 10%) and 1L of distilled water (To ensure that the total volume is still 6.5 L), control the treatment temperature to 20° C., control the pH to 8.5 and keep it for 10 hours.
(4)污泥厌氧处理:预处理结束后,往反应器中充入氮气,持续5min以去除氧气,密封反应器放入摇床进行厌氧处理,其中,摇床处理温度为20±1℃,震荡速度为100rpm/min,污泥的停留时间为10天,即每天需要从运行的反应器中取出0.65L污泥厌氧处理混合物,并添加0.65L(3)中预处理后的新污泥基质,反应器连续运行180天后,反应器中硫化氢的浓度达到稳定,硫化氢的浓度为59ppm。(4) Anaerobic treatment of sludge: After pretreatment, fill nitrogen into the reactor for 5 minutes to remove oxygen, seal the reactor and put it into a shaking table for anaerobic treatment, wherein the shaking table treatment temperature is 20 ± 1 ℃, the shaking speed is 100rpm/min, and the residence time of the sludge is 10 days, that is, 0.65L of sludge anaerobic treatment mixture needs to be taken out from the running reactor every day, and 0.65L (3) of pretreated new Sludge matrix, after 180 days of continuous operation of the reactor, the concentration of hydrogen sulfide in the reactor is stable, and the concentration of hydrogen sulfide is 59ppm.
对比例1Comparative example 1
(1)基质的准备:在工作体积为100L的有机玻璃容器中,对城市污水处理厂产生的污泥进行浓缩处理(即在室温下自然沉淀,然后去除上清液),使得污泥的总悬浮固体为28.9g/L。(1) Preparation of matrix: In a plexiglass container with a working volume of 100L, the sludge produced by the municipal sewage treatment plant was concentrated (that is, naturally precipitated at room temperature, and then the supernatant was removed), so that the total amount of sludge Suspended solids were 28.9g/L.
(2)预处理:将5L(1)中得到的污泥加入反应器中,并添加1.5L的蒸馏水(保证总体积仍为6.5L),控制处理温度为20℃,将pH控制为8.5并保持10小时。(2) Pretreatment: Add 5L of the sludge obtained in (1) into the reactor, and add 1.5L of distilled water (to ensure that the total volume is still 6.5L), control the treatment temperature to 20°C, control the pH to 8.5 and Leave on for 10 hours.
(3)污泥厌氧处理:预处理结束后,往反应器中充入氮气,持续5min以去除氧气,密封反应器放入摇床进行厌氧处理,其中,摇床处理温度为20±1℃,震荡速度为100rpm/min,污泥的停留时间为10天,即每天需要从运行的反应器中取出0.65L污泥厌氧处理混合物,并添加0.65L(2)中预处理后的新污泥基质,反应器连续运行180天后,反应器中硫化氢的浓度达到稳定,硫化氢的浓度为135ppm。(3) Anaerobic treatment of sludge: After the pretreatment, fill the reactor with nitrogen for 5 minutes to remove oxygen, seal the reactor and put it into a shaker for anaerobic treatment, wherein the shaker treatment temperature is 20 ± 1 ℃, the shaking speed is 100rpm/min, and the residence time of the sludge is 10 days, that is, 0.65L sludge anaerobic treatment mixture needs to be taken out from the running reactor every day, and 0.65L (2) of pretreated new Sludge matrix, after 180 days of continuous operation of the reactor, the concentration of hydrogen sulfide in the reactor is stable, and the concentration of hydrogen sulfide is 135ppm.
对比例2Comparative example 2
(1)基质的准备:在工作体积为100L的有机玻璃容器中,对城市污水处理厂产生的污泥进行浓缩处理(即在室温下自然沉淀,然后去除上清液),使得污泥的总悬浮固体为28.9g/L。(1) Preparation of matrix: In a plexiglass container with a working volume of 100L, the sludge produced by the municipal sewage treatment plant was concentrated (that is, naturally precipitated at room temperature, and then the supernatant was removed), so that the total amount of sludge Suspended solids were 28.9g/L.
(2)空白组污泥厌氧处理:不做任何预处理,直接往往反应器中加入5L(1)中得到的污泥,并添加1.5L的蒸馏水(保证总体积仍为6.5L),然后,充入氮气,持续5min以去除氧气,密封反应器放入摇床进行厌氧处理,其中,摇床处理温度为20±1℃,震荡速度为100rpm/min,污泥的停留时间为10天,即每天需要从运行的反应器中取出0.65L污泥厌氧处理混合物,并添加0.65L(1)中得到的污泥,反应器连续运行180天后,反应器中硫化氢的浓度达到稳定,硫化氢的浓度为197ppm。(2) Anaerobic treatment of sludge in the blank group: without any pretreatment, directly add 5L of the sludge obtained in (1) to the reactor, and add 1.5L of distilled water (to ensure that the total volume is still 6.5L), and then , filled with nitrogen, continued for 5 minutes to remove oxygen, sealed the reactor and put it into a shaker for anaerobic treatment, wherein the shaker treatment temperature was 20±1°C, the shaking speed was 100rpm/min, and the residence time of the sludge was 10 days , that is, 0.65L of sludge anaerobic treatment mixture needs to be taken out from the operating reactor every day, and the sludge obtained in 0.65L (1) is added. After the reactor has been continuously operated for 180 days, the concentration of hydrogen sulfide in the reactor has reached a stability. The concentration of hydrogen sulfide was 197 ppm.
实施案例和对比例的硫化氢浓度如表1所示:The hydrogen sulfide concentration of implementation case and comparative example is as shown in table 1:
表1实施例与对比例的处理比较表The processing comparison table of table 1 embodiment and comparative example
从表中可以看出,实施例1和实施例2的硫化氢产量比对比例1和对比例2的硫化氢产量有了很大的减少,尤其是,最优条件下的实施例1的硫化氢产量比对比例2的硫化氢产量减少最大,仅为对比例2的6.6%。As can be seen from the table, the hydrogen sulfide output of embodiment 1 and embodiment 2 has had a great reduction compared with the hydrogen sulfide output of comparative example 1 and comparative example 2, especially, the sulfidation of embodiment 1 under optimal conditions Compared with the hydrogen sulfide production of Comparative Example 2, the hydrogen production decreased the most, which was only 6.6% of that of Comparative Example 2.
上述对实施例的描述是为了便于该技术领域的普通技术人员能理解和使用本发明。虽然本发明已以较佳的实施例揭示如上,然而并非用以限定本发明。在不脱离本发明的精神实质和技术方案的情况下,熟悉本领域技术的人员可以对本发明技术方案做出许多可能的修改,或者修改为等同变化的等效实施例。因此,凡是不脱离本发明范畴所做任何简单的改进和修改都应该在本发明的保护范围之内。The above description of the embodiments is for those of ordinary skill in the art to understand and use the present invention. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Without departing from the spirit and technical solutions of the present invention, those skilled in the art can make many possible modifications to the technical solutions of the present invention, or modify them into equivalent embodiments with equivalent changes. Therefore, any simple improvements and modifications that do not depart from the scope of the present invention should fall within the protection scope of the present invention.
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