CN112794568B - Sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method and reactor - Google Patents

Abstract

The invention discloses a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method which is characterized in that low C/N secondary biochemical effluent of municipal sewage or industrial wastewater treatment plants enters a reactor filled with sludge-based biochar filler and activated sludge floc, and denitrification is enhanced by the conductivity of the sludge-based biochar filler, so that the utilization of main organic matters and an external carbon source in secondary biochemical effluent by denitrifying bacteria is promoted, and the denitrification efficiency is improved; and the treated water enters a sedimentation tank for sedimentation and then is discharged, part of the precipitated sludge flows back to the sludge-based biochar filler for secondary treatment, and part of the precipitated sludge is discharged as residual sludge. Compared with the conventional denitrification deep bed filter tank for the secondary biochemical effluent deep denitrification, the invention has no problems of filter bed blockage and back flushing, and simultaneously prepares the hydrothermal carbon by using the residual sludge and is used for strengthening the secondary biochemical effluent denitrification, thereby not only reducing the denitrification cost, but also realizing the sludge recycling.

Description

Translated fromChinese

污泥基水热炭强化二级生化出水深度脱氮方法及反应器Sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method and reactor

技术领域technical field

本发明涉及一种污泥基水热炭强化二级生化出水深度脱氮方法及反应器，属于污废水处理技术领域。The invention relates to a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method and a reactor, which belong to the technical field of sewage and wastewater treatment.

背景技术Background technique

污水处理过程中生物脱氮可削减进入水体的总氮，从而控制水体富营养化。然而经传统硝化、反硝化后，污废水二级生化出水中仍然剩余一定量的以NO₃^--N形式存在的总氮，排入水体依然存在使水体富营养化的风险。二级生化出水尚需深度脱氮以满足水环境保护要求。In the process of sewage treatment, biological denitrification can reduce the total nitrogen entering the water body, thereby controlling the eutrophication of the water body. However, after traditional nitrification and denitrification, a certain amount of total nitrogen in the form of NO₃^- -N still remains in the secondary biochemical effluent of sewage, and the risk of eutrophication still exists when it is discharged into the water body. The secondary biochemical effluent still needs deep denitrification to meet the requirements of water environmental protection.

外加有机碳源的异养生物反硝化是脱除二级生化出水中NO₃^--N常用方法。但外加碳源不仅增加了运行成本，过量使用还可能导致出水有机物超标。理论上，以廉价的低价态铁和硫等无机物为电子供体的自养反硝化可解决这一问题。铁硫自养反硝化与厌氧氨氧化已成为低C/N比污废水高效脱氮的主流研究方向，但菌种生长速率慢、受水温等环境因素影响较大，是工程应用中面临的共性问题，尤其对于贫营养的二级生化出水，这一问题更为突出。对于含有低浓度氮的二级生化出水，在工程实践中如何强化、优化以外加有机碳源为主的异养反硝化依然是研究及应用的重点。Heterotrophic biological denitrification with organic carbon source is a common method to remove NO₃^- -N from secondary biochemical effluent. However, the additional carbon source not only increases the operating cost, but excessive use may also lead to excessive organic matter in the effluent. Theoretically, autotrophic denitrification using cheap low-valent inorganics such as iron and sulfur as electron donors can solve this problem. Iron-sulfur autotrophic denitrification and anaerobic ammonium oxidation have become the mainstream research directions for efficient denitrification of wastewater with low C/N ratio. The common problem, especially for the nutrient-poor secondary biochemical effluent, is more prominent. For the secondary biochemical effluent containing low concentration of nitrogen, how to strengthen and optimize heterotrophic denitrification with organic carbon sources as the main source in engineering practice is still the focus of research and application.

值得注意的是，出于废弃物资源化目的，国内外开展了以生物质制备的生物炭强化脱氮的研究。生物炭的吸附作用对氮素表现较强去除作用，但吸附不能使氮素最终转化为N₂从而使其无害化去除，只能作为在水中捕集、富集氮素的手段。生物脱氮可将废水中氮素以较低的成本最终转化为N₂去除，生物炭对强化生物脱氮具有明显作用。污水处理过程中产生的剩余污泥也是一种典型的生物质，如能将污泥制备的生物炭用于污水处理厂二级生化出水强化反硝化脱氮，则为污泥资源化同时提升污废水效果提供了新思路。It is worth noting that for the purpose of waste recycling, researches on enhanced denitrification of biochar prepared from biomass have been carried out at home and abroad. The adsorption of biochar has a strong removal effect on nitrogen, but the adsorption cannot convert nitrogen into_N2 so that it can be removed harmlessly. It can only be used as a means of capturing and enriching nitrogen in water. Biological denitrification can finally convert nitrogen in wastewater into N₂ at a lower cost, and biochar has an obvious effect on strengthening biological denitrification. The excess sludge generated in the sewage treatment process is also a typical biomass. If the biochar prepared from the sludge can be used for the enhanced denitrification and denitrification of the secondary biochemical effluent of the sewage treatment plant, it will recycle the sludge and improve the sewage. Wastewater effects provide new ideas.

发明内容SUMMARY OF THE INVENTION

本发明所要解决的技术问题是：如何将污泥制备的生物炭用于污水处理厂二级生化出水强化反硝化脱氮。The technical problem to be solved by the present invention is: how to use the biochar prepared from the sludge to strengthen the denitrification and denitrification of the secondary biochemical effluent of the sewage treatment plant.

为了解决上述技术问题，本发明提供了一种污泥基水热炭强化二级生化出水深度脱氮方法，其特征在于，包括以下步骤：In order to solve the above-mentioned technical problems, the present invention provides a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method, which is characterized by comprising the following steps:

步骤1）：将城市污水或工业废水处理厂低C/N二级生化出水进入装有污泥基水热炭填料和活性污泥絮体的反应器，经过污泥基水热炭填料的电导强化反硝化作用，促进反硝化菌对二级生化出水中本体有机物及外加碳源的利用，提高反硝化脱氮效率；Step 1): The low C/N secondary biochemical effluent from the municipal sewage or industrial wastewater treatment plant enters the reactor equipped with the sludge-based hydrothermal carbon packing and activated sludge flocs, and passes through the conductance of the sludge-based hydrothermal carbon packing. Strengthen denitrification, promote the utilization of organic matter and external carbon sources in secondary biochemical effluent by denitrifying bacteria, and improve the efficiency of denitrification and denitrification;

步骤2）：步骤1）处理后的水进入沉淀池沉淀后排出，部分沉淀污泥回流至污泥基水热炭填料再次处理，部分作为剩余污泥排出。Step 2): The treated water in step 1) enters the sedimentation tank for precipitation and is discharged, and part of the sedimented sludge is returned to the sludge-based hydrothermal carbon filler for reprocessing, and part of it is discharged as excess sludge.

优选地，所述步骤1）中污泥基水热炭填料的装填密度为10~20kg/m³，反应时间为6~15h，以乙酸钠或甲醇为外加碳源，控制进水COD/TN为3.0~3.2。Preferably, in the step 1), the packing density of the sludge-based hydrothermal carbon filler is 10-20 kg/m³ , the reaction time is 6-15 h, and sodium acetate or methanol is used as the external carbon source to control the COD/TN of the influent water. is 3.0~3.2.

优选地，所述步骤1）中污泥基水热炭填料的制备方法为：以污水处理厂剩余污泥为原料，过滤去除污泥中的悬浮杂质，添加水将过滤后污泥稀释后，将其转移至水热釜中并密封；将水热釜加热反应，然后自然冷却至室温，将水热产物通过真空抽滤后得到污泥水热固态产物，然后依次用乙醇、去离子水洗涤产物；干燥后研磨成粉状固体，即为水热炭，将其装填至无纺布袋中制成污泥基水热炭填料。Preferably, the preparation method of the sludge-based hydrothermal carbon filler in the step 1) is as follows: using excess sludge from a sewage treatment plant as a raw material, filtering to remove suspended impurities in the sludge, adding water to dilute the filtered sludge, It is transferred to a hydrothermal kettle and sealed; the hydrothermal kettle is heated and reacted, and then naturally cooled to room temperature, and the hydrothermal product is filtered through vacuum to obtain a sludge hydrothermal solid product, which is then washed with ethanol and deionized water in turn. Product; after drying, it is ground into a powdery solid, which is hydrothermal carbon, which is filled into a non-woven bag to make a sludge-based hydrothermal carbon filler.

更优选地，所述过滤采用100目的过滤器。More preferably, the filtration adopts a 100-mesh filter.

更优选地，所述稀释是将污泥MLSS稀释至1000~3000mg/L。More preferably, the dilution is to dilute the sludge MLSS to 1000-3000 mg/L.

更优选地，所述水热釜加热反应的温度为220℃，时间为4h。More preferably, the temperature of the heating reaction in the hydrothermal kettle is 220°C, and the time is 4h.

更优选地，所述干燥的温度为105℃，时间为2h。More preferably, the drying temperature is 105°C and the drying time is 2h.

本发明还提供了一种污泥基水热炭强化二级生化出水深度脱氮反应器，其特征在于，包括：The present invention also provides a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor, which is characterized by comprising:

设有污泥基水热炭填料和活性污泥絮体的污泥基水热炭强化脱氮反应池，污泥基水热炭强化脱氮反应池设有进水管、出水管，进水管上连接有碳源投加管；The sludge-based hydrothermal carbon enhanced denitrification reaction tank is equipped with sludge-based hydrothermal carbon fillers and activated sludge flocs. The sludge-based hydrothermal carbon enhanced denitrification reaction tank is provided with a water inlet pipe and a water outlet pipe. A carbon source feeding pipe is connected;

与出水管连通的沉淀池，沉淀池的一侧设有废水出水管，底部设有排泥管，排泥管分别连接污泥回流管、污泥排放管，污泥回流管与进水管连通。The sedimentation tank connected with the water outlet pipe is provided with a waste water outlet pipe on one side of the sedimentation tank and a sludge discharge pipe at the bottom.

优选地，所述污泥基水热炭强化脱氮反应池的进水管一侧设有配水渠道，出水管一侧设有集水渠。Preferably, one side of the water inlet pipe of the sludge-based hydrothermal carbon enhanced denitrification reaction tank is provided with a water distribution channel, and one side of the water outlet pipe is provided with a water collection channel.

优选地，所述污泥基水热炭强化脱氮反应池内设有搅拌器，以保持水与污泥基水热炭填料、活性污泥的充分接触。Preferably, an agitator is provided in the sludge-based hydrothermal carbon enhanced denitrification reaction tank to keep the water in full contact with the sludge-based hydrothermal carbon filler and activated sludge.

本发明的原理是：在污泥基水热炭强化二级生化出水脱氮反应器中，污泥基水热炭填料通过提高生物反硝化体系的电导性，提升反硝化菌群丰度，从而提高碳源利用率及脱氮效率。The principle of the invention is as follows: in the sludge-based hydrothermal charcoal enhanced secondary biochemical effluent denitrification reactor, the sludge-based hydrothermal charcoal filler improves the electrical conductivity of the biological denitrification system and increases the abundance of denitrifying bacteria, thereby Improve carbon source utilization and denitrification efficiency.

本发明的适用范围为城市污水处理厂或工业废水处理厂二级生化出水，其中氮素含量以NO₃^--N为主，通过本发明的污泥基水热炭强化二级生化出水深度脱氮反应器，TN可稳定达到《城镇污水处理厂污染物排放标准》（一级A）（TN≤15.0mg/L）。The scope of application of the present invention is the secondary biochemical effluent of urban sewage treatment plants or industrial wastewater treatment plants, wherein the nitrogen content is mainly NO₃^- -N, and the secondary biochemical effluent is enhanced by the sludge-based hydrothermal carbon of the present invention. Nitrogen reactor, TN can stably meet the "Pollutant Discharge Standard for Urban Sewage Treatment Plant" (Class A) (TN≤15.0mg/L).

与传统反硝化深床脱氮滤池相比，本发明提出的污泥基水热炭强化二级生化出水深度脱氮反应器不存在滤床堵塞及反冲洗的问题，同时剩余污泥制备水热炭用于强化二级生化出水反硝化脱氮，不仅提升脱氮效率及降低脱氮成本，而且可实现污泥资源化。Compared with the traditional denitrification deep bed denitrification filter, the sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor proposed by the present invention does not have the problems of filter bed blockage and backwashing, and at the same time the excess sludge is used to prepare water. Thermal carbon is used to strengthen denitrification and denitrification of secondary biochemical effluent, which not only improves denitrification efficiency and reduces denitrification costs, but also realizes sludge recycling.

附图说明Description of drawings

图1为本发明提供的污泥基水热炭强化二级生化出水深度脱氮反应器的示意图。Fig. 1 is a schematic diagram of a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor provided by the present invention.

具体实施方式Detailed ways

为使本发明更明显易懂，兹以优选实施例，并配合附图作详细说明如下。In order to make the present invention more obvious and comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

本发明提供了一种污泥基水热炭强化二级生化出水深度脱氮方法，包括以下步骤：The invention provides a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification method, comprising the following steps:

步骤1）：将城市污水或工业废水处理厂低C/N二级生化出水进入装有污泥基水热炭填料和活性污泥絮体的反应器，经过污泥基水热炭填料的电导强化反硝化作用，促进反硝化菌对二级生化出水中本体有机物及外加碳源的利用，提高反硝化脱氮效率；Step 1): The low C/N secondary biochemical effluent from the municipal sewage or industrial wastewater treatment plant enters the reactor equipped with the sludge-based hydrothermal carbon packing and activated sludge flocs, and passes through the conductance of the sludge-based hydrothermal carbon packing. Strengthen denitrification, promote the utilization of organic matter and external carbon sources in secondary biochemical effluent by denitrifying bacteria, and improve the efficiency of denitrification and denitrification;

步骤2）：步骤1）处理后的水进入沉淀池沉淀后排出，部分沉淀污泥回流至污泥基水热炭填料再次处理，部分作为剩余污泥排出。Step 2): The treated water in step 1) enters the sedimentation tank for precipitation and is discharged, and part of the sedimented sludge is returned to the sludge-based hydrothermal carbon filler for reprocessing, and part of it is discharged as excess sludge.

所述步骤1）中污泥基水热炭填料的制备方法为：以污水处理厂剩余污泥为原料，采用100目的过滤器过滤去除污泥中的悬浮杂质，添加水将过滤后污泥MLSS稀释至1000~3000mg/L后，将其转移至水热釜中并密封；将水热釜加热至温度为220℃，反应4h，然后自然冷却至室温，将水热产物通过真空抽滤后得到污泥水热固态产物，然后依次用乙醇、去离子水洗涤产物；105℃干燥2h后研磨成粉状固体，即为水热炭，将其装填至无纺布袋中制成污泥基水热炭填料。反应器内污泥基水热炭填料的装填密度为10~20kg/m³，反应时间为6~15h，以乙酸钠或甲醇为外加碳源，控制进水COD/TN为3.0~3.2；The preparation method of the sludge-based hydrothermal carbon filler in the step 1) is as follows: using excess sludge from a sewage treatment plant as a raw material, using a 100-mesh filter to filter to remove suspended impurities in the sludge, and adding water to filter the MLSS of the filtered sludge. After being diluted to 1000~3000mg/L, it was transferred to a hydrothermal kettle and sealed; the hydrothermal kettle was heated to a temperature of 220 ° C, reacted for 4 hours, and then cooled to room temperature naturally, and the hydrothermal product was filtered through vacuum suction to obtain Sludge hydrothermal solid product, then washed the product with ethanol and deionized water in turn; dried at 105°C for 2 hours and ground into powdery solid, which is hydrothermal carbon, which was filled into non-woven bags to make sludge-based water Hot charcoal filler. The packing density of the sludge-based hydrothermal carbon packing in the reactor is 10~20kg/m³ , the reaction time is 6~15h, and sodium acetate or methanol is used as the external carbon source, and the COD/TN of the influent water is controlled to be 3.0~3.2;

本发明还提供了一种污泥基水热炭强化二级生化出水深度脱氮反应器，如图1所示，其包括设有污泥基水热炭填料3和活性污泥絮体5的污泥基水热炭强化脱氮反应池4及与出水管7连通的沉淀池8，污泥基水热炭强化脱氮反应池4设有进水管1、出水管7，进水管1上连接有碳源投加管15；沉淀池8的一侧设有废水出水管9，底部设有排泥管11，排泥管11分别连接污泥回流管14、污泥排放管12，污泥回流管14与进水管1连通。所述污泥基水热炭强化脱氮反应池4的进水管1一侧设有配水渠道2，出水管7一侧设有集水渠6。所述污泥基水热炭强化脱氮反应池4内设有搅拌器13。The present invention also provides a sludge-based hydrothermal carbon enhanced secondary biochemical effluent deep denitrification reactor, as shown in FIG. 1 , which includes a sludge-basedhydrothermal carbon filler 3 and an activatedsludge floc 5 . The sludge-based hydrothermal carbon enhanceddenitrification reaction tank 4 and thesedimentation tank 8 communicated with the water outlet pipe 7. The sludge-based hydrothermal carbon enhanceddenitrification reaction tank 4 is provided with a water inlet pipe 1 and a water outlet pipe 7, and the water inlet pipe 1 is connected to There is a carbonsource feeding pipe 15; one side of thesedimentation tank 8 is provided with a waste water outlet pipe 9, and the bottom is provided with asludge discharge pipe 11. Thesludge discharge pipe 11 is respectively connected to thesludge return pipe 14 and thesludge discharge pipe 12, and the sludge returns Thepipe 14 communicates with the water inlet pipe 1 . The sludge-based hydrothermal carbon enhanceddenitrification reaction tank 4 is provided with awater distribution channel 2 on one side of the water inlet pipe 1 , and awater collection channel 6 on one side of the water outlet pipe 7 . Anagitator 13 is provided in the sludge-based hydrothermal carbon enhanceddenitrification reaction tank 4 .

实施例Example

本实施例中的废水原水来自于上海松江某城市污水处理厂二级生化出水，其化学需氧量（COD），硝酸盐氮（NO₃^--N），亚硝酸盐氮（NO₂^--N）和氨氮（NH₄⁺-N）的浓度分别为20.4±7.3 mg/L、10.5±0.7 mg/L、0.02±0.02 mg/L和0.15±0.3mg/L，由于经过充分的硝化，废水中氮素形态主要以NO₃^--N为主。The raw water of wastewater in this example comes from the secondary biochemical effluent of an urban sewage treatment plant in Songjiang, Shanghai, and its chemical oxygen demand (COD), nitrate nitrogen (NO₃^- -N), nitrite nitrogen (NO₂^- - N) and ammonia nitrogen (NH₄⁺ -N) concentrations were 20.4 ± 7.3 mg/L, 10.5 ± 0.7 mg/L, 0.02 ± 0.02 mg/L and 0.15 ± 0.3 mg/L, respectively. The form of middle nitrogen is mainly NO₃^- -N.

污泥基水热炭的制备是以该污水处理厂二沉池排出剩余污泥为原料，以首先通过100目过滤器将污泥中的悬浮杂质去除，添加水将过滤后污泥MLSS稀释至1000~3000 mg/L，然后将其转移至水热釜中并密封。将水热釜加热，设定温度220℃条件下反应4h，并自然冷却至室温。将水热产物通过真空抽滤后得到污泥水热固态产物，然后依次用乙醇和去离子水洗涤产物。最后，在105℃条件下干燥2h后，得到黑灰色块状水热炭并研磨成粉状固体。将水热炭装填至无纺布袋中制备成污泥基水热炭填料。The preparation of sludge-based hydrothermal charcoal takes the excess sludge discharged from the secondary sedimentation tank of the sewage treatment plant as the raw material, firstly removes the suspended impurities in the sludge through a 100-mesh filter, and adds water to dilute the filtered sludge MLSS to 1000~3000 mg/L, then transferred to a hydrothermal kettle and sealed. The hydrothermal kettle was heated, reacted for 4 hours at a set temperature of 220 °C, and cooled to room temperature naturally. The hydrothermal product is filtered through vacuum suction to obtain a hydrothermal solid product of sludge, and then the product is washed with ethanol and deionized water in sequence. Finally, after drying at 105 °C for 2 h, a black-gray massive hydrothermal carbon was obtained and ground into a powdery solid. The hydrothermal charcoal was filled into a non-woven bag to prepare a sludge-based hydrothermal charcoal filler.

将污泥基水热炭填料填装至污泥基水热炭强化脱氮反应器中，二级生化出水进入污泥基水热炭强化脱氮反应池，以乙酸钠或甲醇为外加碳源控制进水COD/TN为3.0~3.2，在反应池中污泥基水热炭填料和活性污泥絮体的综合作用下提高碳源利用率和脱氮效率，实现NO₃^--N转化为N₂的高效脱氮，反应完成后泥水混合液进入沉淀池沉淀，沉淀后废水排出；沉淀池污泥定期经回流管道回流至进水管，与二级生化出水混合后进入反应池，以补充流失的污泥。经处理后，废水COD低于15.0mg/L，TN低于5.0 mg/L。The sludge-based hydrothermal carbon filler is filled into the sludge-based hydrothermal carbon enhanced denitrification reactor, and the secondary biochemical effluent enters the sludge-based hydrothermal carbon enhanced denitrification reaction tank, using sodium acetate or methanol as the external carbon source Control the COD/TN of the influent water to be 3.0~3.2, under the comprehensive action of the sludge-based hydrothermal carbon filler and activated sludge flocs in the reaction tank, the utilization rate of carbon source and the denitrification efficiency are improved, and the conversion of NO₃^- -N into The high-efficiency denitrification of_N2 , after the reaction is completed, the mud-water mixture enters the sedimentation tank for precipitation, and the wastewater is discharged after sedimentation; the sludge in the sedimentation tank is periodically returned to the water inlet pipe through the return pipe, mixed with the secondary biochemical effluent, and then enters the reaction tank to supplement the loss. of sludge. After treatment, the COD of the wastewater is lower than 15.0 mg/L, and the TN is lower than 5.0 mg/L.

本发明的一种污泥基水热炭强化二级生化出水深度脱氮反应器，包括污泥基水热炭强化脱氮反应池4和沉淀池8，其特征在于：所述污泥基水热炭强化脱氮反应池中装填污泥基水热炭填料3，反应池进水侧设置配水渠道2，进水管1与配水渠道、碳源投加管15相连接，反应池底部设置搅拌器13，反应池出水侧设置集水渠6，集水渠与反应池出水管7相连接；反应池出水管7与沉淀池8相连接，沉淀池后废水经出水管9排出，沉淀池底部排泥管11与污泥回流管14、污泥排放管12相连接，回流污泥经污泥回流管14回流与进水管1中二级生化出水混合后进入反应池，剩余污泥经污泥排放管12排放，在反应池中由污泥基水热炭填料3和活性污泥絮体5共同完成强化反硝化脱氮过程。A sludge-based hydrothermal charcoal enhanced secondary biochemical effluent deep denitrification reactor of the present invention includes a sludge-based hydrothermal charcoal enhanceddenitrification reaction tank 4 and asedimentation tank 8, and is characterized in that: the sludge-based water The thermal carbon enhanced denitrification reaction tank is filled with sludge-basedhydrothermal carbon filler 3, the water inlet side of the reaction tank is provided with awater distribution channel 2, the water inlet pipe 1 is connected with the water distribution channel and the carbonsource addition pipe 15, and an agitator is installed at the bottom of thereaction tank 13. Thewater collecting channel 6 is arranged on the water outlet side of the reaction tank, and the water collecting channel is connected with the water outlet pipe 7 of the reaction tank; the water outlet pipe 7 of the reaction tank is connected with thesedimentation tank 8, the wastewater after the sedimentation tank is discharged through the water outlet pipe 9, and the sludge discharge pipe at the bottom of thesedimentation tank 11 is connected with thesludge return pipe 14 and thesludge discharge pipe 12. The return sludge is returned through thesludge return pipe 14 and mixed with the secondary biochemical effluent in the water inlet pipe 1, and then enters the reaction tank, and the excess sludge passes through thesludge discharge pipe 12. In the reaction tank, the sludge-basedhydrothermal carbon filler 3 and the activatedsludge flocs 5 jointly complete the enhanced denitrification and denitrification process.

Claims (5)

Translated fromChinese

1.一种污泥基水热炭强化二级生化出水深度脱氮方法，其特征在于，包括以下步骤：1. a sludge-based hydrothermal charcoal strengthening secondary biochemical effluent deep denitrification method, is characterized in that, comprises the following steps:步骤1）：将城市污水或工业废水处理厂低C/N二级生化出水进入装有污泥基水热炭填料和活性污泥絮体的反应器，经过污泥基水热炭填料的电导强化反硝化作用，促进反硝化菌对二级生化出水中本体有机物及外加碳源的利用，提高反硝化脱氮效率；所述污泥基水热炭填料的制备方法为：以污水处理厂剩余污泥为原料，过滤去除污泥中的悬浮杂质，添加水将过滤后污泥稀释后，将其转移至水热釜中并密封；将水热釜加热反应，然后自然冷却至室温，将水热产物通过真空抽滤后得到污泥水热固态产物，然后依次用乙醇、去离子水洗涤产物；干燥后研磨成粉状固体，即为水热炭，将其装填至无纺布袋中制成污泥基水热炭填料；所述过滤采用100目的过滤器；所述稀释是将污泥MLSS稀释至1000~3000mg/L；其特征在于，所述水热釜加热反应的温度为220℃，时间为4h；其特征在于，所述干燥的温度为105℃，时间为2h；Step 1): The low C/N secondary biochemical effluent from the municipal sewage or industrial wastewater treatment plant enters the reactor equipped with the sludge-based hydrothermal carbon packing and activated sludge flocs, and passes through the conductance of the sludge-based hydrothermal carbon packing. Strengthen denitrification, promote denitrification bacteria to utilize organic matter and external carbon source in secondary biochemical effluent, and improve denitrification and denitrification efficiency; the preparation method of the sludge-based hydrothermal carbon filler is as follows: using the residual amount of the sewage treatment plant The sludge is used as the raw material, and the suspended impurities in the sludge are removed by filtration. After adding water to dilute the filtered sludge, it is transferred to a hydrothermal kettle and sealed; the hydrothermal kettle is heated and reacted, and then cooled to room temperature naturally. The hot product is filtered by vacuum to obtain a sludge hydrothermal solid product, and then the product is washed with ethanol and deionized water in turn; after drying, it is ground into a powdery solid, which is hydrothermal carbon, which is filled into a non-woven bag to make. Sludge-based hydrothermal carbon filler; the filtration adopts a 100-mesh filter; the dilution is to dilute the sludge MLSS to 1000~3000mg/L; it is characterized in that the temperature of the hydrothermal kettle heating reaction is 220°C , the time is 4h; it is characterized in that, the drying temperature is 105°C, and the time is 2h;步骤2）：步骤1）处理后的水进入沉淀池沉淀后排出，部分沉淀污泥回流至污泥基水热炭填料再次处理，部分作为剩余污泥排出。Step 2): The treated water in step 1) enters the sedimentation tank for precipitation and is discharged, and part of the sedimented sludge is returned to the sludge-based hydrothermal carbon filler for reprocessing, and part of it is discharged as excess sludge.2.如权利要求1所述的污泥基水热炭强化二级生化出水深度脱氮方法，其特征在于，所述步骤1）中污泥基水热炭填料的装填密度为10~20kg/m³，反应时间为6~15h，以乙酸钠或甲醇为外加碳源，控制进水COD/TN为3.0~3.2。2. The sludge-based hydrothermal charcoal enhanced secondary biochemical effluent deep denitrification method according to claim 1, wherein the packing density of the sludge-based hydrothermal charcoal filler in the step 1) is 10-20kg/ m³ , the reaction time is 6~15h, sodium acetate or methanol is used as the external carbon source, and the COD/TN of the influent water is controlled to be 3.0~3.2.3.如权利要求1所述的污泥基水热炭强化二级生化出水深度脱氮方法，其特征在于，采用如下污泥基水热炭强化二级生化出水深度脱氮反应器，包括：3. The sludge-based hydrothermal charcoal-enhanced secondary biochemical effluent deep denitrification method as claimed in claim 1, wherein the following sludge-based hydrothermal charcoal reinforced secondary biochemical effluent deep denitrification reactor is adopted, comprising:设有污泥基水热炭填料（3）和活性污泥絮体（5）的污泥基水热炭强化脱氮反应池（4），污泥基水热炭强化脱氮反应池（4）设有进水管（1）、出水管（7），进水管（1）上连接有碳源投加管（15）；A sludge-based hydrothermal carbon enhanced denitrification reaction tank (4) equipped with a sludge-based hydrothermal carbon filler (3) and an activated sludge floc (5), a sludge-based hydrothermal carbon enhanced denitrification reaction tank (4) ) is provided with a water inlet pipe (1) and a water outlet pipe (7), and a carbon source feeding pipe (15) is connected to the water inlet pipe (1);与出水管（7）连通的沉淀池（8），沉淀池（8）的一侧设有废水出水管（9），底部设有排泥管（11），排泥管（11）分别连接污泥回流管（14）、污泥排放管（12），污泥回流管（14）与进水管（1）连通。The sedimentation tank (8) communicated with the water outlet pipe (7), a waste water outlet pipe (9) is arranged on one side of the sedimentation tank (8), and a sludge discharge pipe (11) is arranged at the bottom, and the sludge discharge pipes (11) are respectively connected to the sewage. The sludge return pipe (14), the sludge discharge pipe (12), and the sludge return pipe (14) are communicated with the water inlet pipe (1).4.如权利要求3所述的污泥基水热炭强化二级生化出水深度脱氮方法，其特征在于，所述污泥基水热炭强化脱氮反应池（4）的进水管（1）一侧设有配水渠道（2），出水管（7）一侧设有集水渠（6）。4. The sludge-based hydrothermal charcoal enhanced secondary biochemical effluent deep denitrification method according to claim 3, characterized in that, the water inlet pipe (1) of the sludge-based hydrothermal charcoal enhanced denitrification reaction tank (4) ) is provided with a water distribution channel (2) on one side, and a collection channel (6) is provided on one side of the water outlet pipe (7).5.如权利要求3所述的污泥基水热炭强化二级生化出水深度脱氮方法，其特征在于，所述污泥基水热炭强化脱氮反应池（4）内设有搅拌器（13）。5. The sludge-based hydrothermal charcoal enhanced secondary biochemical effluent deep denitrification method according to claim 3, characterized in that, the sludge-based hydrothermal charcoal enhanced denitrification reaction tank (4) is provided with a stirrer (13).

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