CN114291943A - Process for treating production wastewater of benzohydroxamic acid by ozone iron-carbon micro-electrolysis - Google Patents

Process for treating production wastewater of benzohydroxamic acid by ozone iron-carbon micro-electrolysis Download PDF

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CN114291943A
CN114291943A CN202210033499.0A CN202210033499A CN114291943A CN 114291943 A CN114291943 A CN 114291943A CN 202210033499 A CN202210033499 A CN 202210033499A CN 114291943 A CN114291943 A CN 114291943A
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iron
ozone
electrolysis
carbon micro
production wastewater
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陈秋丽
麦戈
毛娜
卓献荣
林冲
陈仕光
陈学彬
罗智彬
罗志高
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Zhongkai University of Agriculture and Engineering
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Abstract

本发明提供了一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,包括以下步骤:S01、往苯甲羟肟酸生产废水通入臭氧,持续进行臭氧反应;S02、加入过氧化氢、铁碳混合试剂,搅拌均匀,持续进行铁碳微电解反应;S03、加入氢氧化钙溶液调节PH值,然后持续曝气;S04、静置沉降,使铁碳微电解反应所得的氢氧化亚铁和氢氧化铁沉淀。本发明通过臭氧+铁碳微电解反应及最优的试验数据研究完成高效的废水处理。

Figure 202210033499

The invention provides an ozone iron-carbon micro-electrolysis process for treating benzhydroxamic acid production wastewater, comprising the following steps: S01, introducing ozone into the benzhydroxamic acid production wastewater, and continuously performing ozone reaction; S02, adding hydrogen peroxide , the iron-carbon mixed reagent, stir evenly, and continue to carry out the iron-carbon micro-electrolysis reaction; S03, add calcium hydroxide solution to adjust the pH value, and then continue to aerate; S04, let stand and settle, so that the iron-carbon micro-electrolysis reaction is obtained. Iron and ferric hydroxide precipitate. The present invention completes high-efficiency wastewater treatment through ozone+iron-carbon micro-electrolysis reaction and optimal experimental data research.

Figure 202210033499

Description

一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺A kind of ozone iron carbon micro-electrolysis process for benzhydroxamic acid production wastewater

技术领域technical field

本发明涉及水处理工艺领域,具体涉及一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺。The invention relates to the field of water treatment technology, in particular to a technology for treating benzhydroxamic acid production wastewater by ozone iron-carbon micro-electrolysis.

背景技术Background technique

水环境污染给水处理带来极大的挑战,对城市安全供水造成了很大的威胁。随着经济社会的发展进步,工业生产对矿产品的需求不断扩大,导致采矿业蓬勃发展,其中,苯甲羟肟酸就是比较常用的选矿剂,属于难降解的有机物。Water environment pollution brings great challenges to water treatment and poses a great threat to the safe water supply of cities. With the development and progress of the economy and society, the demand for mineral products in industrial production continues to expand, resulting in the vigorous development of the mining industry. Among them, benzhydroxamic acid is a commonly used mineral processing agent, which is a refractory organic matter.

苯甲羟肟酸生产废水是一种酸性强、有刺激气味、COD含量高的有机废水。直接排放到自然环境中,会在水体、土壤等环境中富集累积,从而造成水体和土壤的污染,被生物摄取后会在生物体内累积产生生理毒性。因此,寻找快捷、有效的方法处理苯甲羟肟酸生产废水具重大意义。Benzohydroxamic acid production wastewater is an organic wastewater with strong acidity, pungent odor and high COD content. If it is directly discharged into the natural environment, it will accumulate in water, soil and other environments, resulting in pollution of water and soil. After being ingested by organisms, it will accumulate in organisms and produce physiological toxicity. Therefore, it is of great significance to find a quick and effective method to treat benzhydroxamic acid production wastewater.

目前,使用生物化学法处理羟肟酸的研究较少,对含羟肟酸类捕收剂的选矿工业废水的研究更少。处理工业废水的研究中,有物化工艺、生化工艺、深度处理和高级氧化技术等。然而在实际工业生产中,选矿药剂废水的成分各不相同,大大增加了废水处理的难度,单独的工艺很难保证完全去除水中有机类物质。At present, there are few studies on the use of biochemical methods to treat hydroxamic acid, and less research on mineral processing industrial wastewater containing hydroxamic acid collectors. In the research of industrial wastewater treatment, there are physicochemical process, biochemical process, advanced treatment and advanced oxidation technology. However, in actual industrial production, the composition of mineral processing chemical wastewater is different, which greatly increases the difficulty of wastewater treatment. It is difficult to ensure complete removal of organic substances in water by a separate process.

不难看出,现有技术还存在一定的缺陷。It is not difficult to see that the prior art still has certain defects.

发明内容SUMMARY OF THE INVENTION

本发明所要解决的技术问题是提供一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,通过臭氧+铁碳微电解反应及最优的试验数据研究完成高效的废水处理。The technical problem to be solved by the present invention is to provide a process for treating benzhydroxamic acid production wastewater by ozone-iron-carbon micro-electrolysis, and complete efficient wastewater treatment through ozone+iron-carbon micro-electrolysis reaction and optimal experimental data research.

为实现上述目的,本发明采用以下技术方案:To achieve the above object, the present invention adopts the following technical solutions:

一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,包括以下步骤:A process for treating benzhydroxamic acid production wastewater by ozone iron carbon micro-electrolysis, comprising the following steps:

S01、往苯甲羟肟酸生产废水通入臭氧,持续进行臭氧反应;S01, feed ozone into the benzohydroxamic acid production wastewater, and continue to carry out ozone reaction;

S02、加入过氧化氢、铁碳混合试剂,搅拌均匀,持续进行铁碳微电解反应;S02, add hydrogen peroxide, iron-carbon mixed reagent, stir evenly, and continue to carry out iron-carbon micro-electrolysis reaction;

S03、加入氢氧化钙溶液调节PH值,然后持续曝气;S03, add calcium hydroxide solution to adjust PH value, and then continue to aerate;

S04、静置沉降,使铁碳微电解反应所得的氢氧化亚铁和氢氧化铁沉淀。S04, standing and settling, so that the ferrous hydroxide and ferric hydroxide obtained by the iron-carbon micro-electrolysis reaction are precipitated.

进一步的,所述步骤S01中,臭氧反应时间60-120min。Further, in the step S01, the ozone reaction time is 60-120min.

进一步的,所述步骤S01中,臭氧的投加量为:每升苯甲羟肟酸生产废水对应6g/h。Further, in the step S01, the dosage of ozone is as follows: every liter of benzhydroxamic acid production wastewater corresponds to 6g/h.

进一步的,所述步骤S02中,过氧化氢的投加量为:每升苯甲羟肟酸生产废水对应12ml过氧化氢。Further, in the step S02, the dosage of hydrogen peroxide is as follows: every liter of benzhydroxamic acid production wastewater corresponds to 12 ml of hydrogen peroxide.

进一步的,所述步骤S02中,铁碳比例为1:3。Further, in the step S02, the ratio of iron to carbon is 1:3.

进一步的,所述步骤S02中,铁碳的投加量为:每升苯甲羟肟酸生产废水对应160g的铁碳。Further, in the step S02, the dosage of iron carbon is as follows: every liter of benzhydroxamic acid production wastewater corresponds to 160 g of iron carbon.

进一步的,所述步骤S02中,铁碳微电解反应时间为1h。Further, in the step S02, the iron-carbon micro-electrolysis reaction time is 1h.

进一步的,所述步骤S03中,加入氢氧化钙溶液将PH值调至7。Further, in the step S03, calcium hydroxide solution is added to adjust the pH value to 7.

进一步的,所述步骤S03中,曝气时间为30-60min。Further, in the step S03, the aeration time is 30-60min.

进一步的,所述步骤S04中,沉降时间为4h。Further, in the step S04, the settling time is 4h.

本发明提供的一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,具有以下优点:The invention provides a process for treating benzhydroxamic acid production wastewater by ozone iron carbon micro-electrolysis, which has the following advantages:

通过臭氧+铁碳微电解联合工艺,高效处理苯甲羟肟酸生产废水,比起单独处理工艺效果更好。所有的工艺数据均通过实验测试,得出最优参数,COD去除率高。Through the combined process of ozone + iron-carbon micro-electrolysis, the wastewater from benzhydroxamic acid production is efficiently treated, which is better than the single treatment process. All process data are tested by experiments, and the optimal parameters are obtained, and the COD removal rate is high.

附图说明Description of drawings

为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

图1为本发明实施例一提供的一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺的流程示意图。Fig. 1 is a kind of schematic process flow diagram of a kind of ozone iron carbon micro-electrolysis treatment process of benzhydroxamic acid production wastewater provided in the first embodiment of the present invention.

具体实施方式Detailed ways

为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例和附图,对本发明实施例中的技术方案进行清楚、完整地描述。需要说明的是,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

实施例一Example 1

请参阅图1,本发明实施例单独针对苯甲羟肟酸生产废水的处理,提供了一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,具体包括以下步骤:Please refer to Fig. 1, the embodiment of the present invention provides a kind of ozone iron carbon micro-electrolysis process for the treatment of benzhydroxamic acid production wastewater alone, and specifically comprises the following steps:

S01、往苯甲羟肟酸生产废水通入臭氧,持续进行臭氧反应;S01, feed ozone into the benzohydroxamic acid production wastewater, and continue to carry out ozone reaction;

S02、加入过氧化氢、铁碳混合试剂,搅拌均匀,持续进行铁碳微电解反应;S02, add hydrogen peroxide, iron-carbon mixed reagent, stir evenly, and continue to carry out iron-carbon micro-electrolysis reaction;

S03、加入氢氧化钙溶液调节PH值,然后持续曝气;S03, add calcium hydroxide solution to adjust PH value, and then continue to aerate;

S04、静置沉降,使铁碳微电解反应所得的氢氧化亚铁和氢氧化铁沉淀。S04, standing and settling, so that the ferrous hydroxide and ferric hydroxide obtained by the iron-carbon micro-electrolysis reaction are precipitated.

本发明的工艺特点,是采用了先臭氧、后铁碳微电解的联合处理工艺。其工艺原理是:The technological feature of the invention is that a combined treatment process of ozone first and iron-carbon micro-electrolysis is adopted. The process principle is:

臭氧高级氧化机理:Ozone advanced oxidation mechanism:

臭氧是一种具有极强氧化性的氧化剂,通过其氧化性发生直接反应,在较高PH溶液中间接触氧化反应产生羟基自由基,利用羟基自由基的氧化作用,从而使得有机物得到降解。臭氧的氧化性要强于氯气,能够透过细胞膜,使得细胞内部核酸和蛋白质失活,从而杀死水中的细菌,以及氧化去除水中的有机污染物。Ozone is a very strong oxidizing oxidant. Through its oxidizing property, it reacts directly, and in the middle of a higher pH solution, the contact oxidation reaction produces hydroxyl radicals, and the oxidation of hydroxyl radicals is utilized to degrade organic matter. The oxidizing property of ozone is stronger than that of chlorine. It can penetrate the cell membrane and inactivate the nucleic acid and protein inside the cell, thereby killing bacteria in the water and oxidizing and removing organic pollutants in the water.

臭氧凭借其超强的氧化能力,可用于处理水中的各种污染物,尤其是生物难降解有机污染物,可以达到较好的处理效果。由于在单独O3处理条件下,只能产生少量的羟基自由基,因此只有与其他物理催化或者化学方法配合,才能激发生成更多的羟基自由基。其中,在亚铁离子和铁离子的催化下,臭氧能够分解,产生更多羟基自由基。其原理如下:Ozone can be used to treat various pollutants in water, especially biologically refractory organic pollutants, with its super oxidizing ability, and can achieve better treatment effects. Since only a small amount of hydroxyl radicals can be generated under the condition of O3 treatment alone, more hydroxyl radicals can be excited and generated only by coordinating with other physical catalysis or chemical methods. Among them, under the catalysis of ferrous ions and iron ions, ozone can be decomposed to generate more hydroxyl radicals. The principle is as follows:

O3+OH-→.O2+.HO2 O 3 +OH - →.O 2 +.HO 2

O3+.HO2→2O2+.OHO 3 +.HO 2 →2O 2 +.OH

Fe2++O3→Fe3++.O3 - Fe 2+ +O 3 →Fe 3+ +.O 3 -

H++.O3 -→O2+.OHH + +.O 3 - →O 2 +.OH

Fe2++O3→FeO2++O2 Fe 2+ +O 3 →FeO 2+ +O 2

FeO2++HO2→Fe3++.OH+OH- FeO 2+ +HO 2 →Fe 3+ +.OH+OH -

铁碳微电解原理:Iron-carbon micro-electrolysis principle:

铁碳微电解能够在废水中进行氧化还原反应,在亚铁离子和氢原子的作用下,废水中的难降解有机污染物质得到降解;同时,亚铁离子和铁离子能够形成氢氧化亚铁和氢氧化铁沉淀发挥混凝作用,将废水中的悬浮物和有机物脱稳,凝聚成絮凝体,有机物从而得到去除,具体原理如下:Iron-carbon micro-electrolysis can carry out redox reactions in wastewater. Under the action of ferrous ions and hydrogen atoms, refractory organic pollutants in wastewater are degraded; at the same time, ferrous ions and iron ions can form ferrous hydroxide and Ferric hydroxide precipitation plays a coagulation role, destabilizing the suspended solids and organic substances in the wastewater, and condensing them into flocs, and the organic substances are removed. The specific principles are as follows:

(1)电化学作用:对废水起到主要作用的是电化学反应,其电极反应式为:(1) Electrochemical action: The electrochemical reaction plays a major role in wastewater, and the electrode reaction formula is:

无氧条件下的阳极反应:Anodic reaction under oxygen-free conditions:

Fe-2eFe→Fe2+ Fe-2eFe→Fe 2+

无氧条件下的阴极反应:Cathodic reaction under anaerobic conditions:

2H++2e→H2 2H + +2e→H 2

有氧条件下的阳极反应:Anodic reaction under aerobic conditions:

Fe-2eFe→Fe2+ Fe-2eFe→Fe 2+

有氧条件下的阴极反应:Cathodic reaction under aerobic conditions:

O2+4H++4e→2H2O(酸性条件)O 2 +4H + +4e→2H 2 O (acidic conditions)

O2+2H2O+4e→4OH-(中性或碱性条件)O 2 +2H 2 O+4e→4OH - (neutral or basic conditions)

从上述铁碳电极反应式可知,在酸性有氧条件下,铁碳发生电化学腐蚀最快,处理废水的效果最好。It can be seen from the above reaction formula of iron-carbon electrode that under acidic aerobic conditions, the electrochemical corrosion of iron-carbon is the fastest, and the effect of wastewater treatment is the best.

(2)还原作用:在经过电极反应后,溶液中具有高活性的原子H,初生态亚铁离子,它们能够使有机物断裂和开环,从而使有机物降解。(2) Reduction: After the electrode reaction, there are highly active atomic H and nascent ferrous ions in the solution, which can break and open the organic matter, thereby degrading the organic matter.

(3)氧化作用:在电化学反应过程中,能够生成自由基,从而将有机物氧化去除。(3) Oxidation: in the process of electrochemical reaction, free radicals can be generated, thereby oxidizing and removing organic matter.

(4)混凝作用:阳极的铁失去两个电子,生成亚铁离子,在有氧和碱性条件下,能够转化为氢氧亚铁和氢氧化铁沉淀,其能吸附有机物,成为絮凝体沉降下来,有机物得以去除,反应过程为:(4) Coagulation: the iron in the anode loses two electrons to form ferrous ions, which can be converted into ferrous hydroxide and ferric hydroxide precipitation under aerobic and alkaline conditions, which can adsorb organic matter and become flocs Settling down, the organic matter is removed, and the reaction process is:

Fe2++2OH-=Fe(OH)2Fe 2+ +2OH - =Fe(OH) 2

4Fe2++8OH-+O2+2H2O=4Fe(OH)24Fe 2+ +8OH - +O 2 +2H 2 O=4Fe(OH) 2

研究表明,臭氧+铁碳微电解联合工艺的处理效果比铁碳微电解+臭氧联合工艺的处理效果更好。这是由于,如果铁碳微电解反应在前,经过铁碳微电解后,废水中容易降解的有机物先被去除,在后续的臭氧反应中,虽然铁碳微电解反应后的铁离子能够催化臭氧氧化,但是废水中剩下的大部分是难降解有机物,且没有氢氧化铁混凝沉淀的作用,导致臭氧氧化有机物的能力下降。故将臭氧氧化反应提前。The research shows that the treatment effect of ozone + iron-carbon micro-electrolysis combined process is better than that of iron-carbon micro-electrolysis + ozone combined process. This is because, if the iron-carbon micro-electrolysis reaction is performed first, after the iron-carbon micro-electrolysis, the easily degradable organic substances in the wastewater will be removed first. In the subsequent ozone reaction, although the iron ions after the iron-carbon micro-electrolysis reaction can catalyze ozone However, most of the remaining waste water is refractory organic matter, and there is no coagulation and precipitation effect of ferric hydroxide, resulting in a decrease in the ability of ozone to oxidize organic matter. Therefore, the ozone oxidation reaction is advanced.

优选的,所述步骤S01中,臭氧反应时间60-120min。研究表明,苯甲羟肟酸废水中有机物的降解速率与臭氧的反应时间呈正相关的关系,反应时间低于60min时,有机物降解速率随臭氧反应时间增加明显加快;反应时间超过60min时,有机物降解速率的增长放缓。考虑到处理效率的问题,臭氧反应最佳的反应时间是60min。Preferably, in the step S01, the ozone reaction time is 60-120 min. Studies have shown that the degradation rate of organic matter in benzhydroxamic acid wastewater is positively correlated with the reaction time of ozone. When the reaction time is less than 60min, the degradation rate of organic matter increases significantly with the increase of ozone reaction time; when the reaction time exceeds 60min, the degradation rate of organic matter rate growth has slowed. Considering the problem of treatment efficiency, the optimal reaction time of ozone reaction is 60min.

优选的,所述步骤S01中,臭氧的投加量为:每升苯甲羟肟酸生产废水对应6g/h。研究表明,由于臭氧投加量的增加,苯甲羟肟酸生产废水中大分子有机物被快速地、有效地、彻底地分解。Preferably, in the step S01, the dosage of ozone is: 6 g/h per liter of benzhydroxamic acid production wastewater. Studies have shown that due to the increase of ozone dosage, macromolecular organic matter in benzhydroxamic acid production wastewater is rapidly, effectively and completely decomposed.

优选的,所述步骤S02中,过氧化氢的投加量为:每升苯甲羟肟酸生产废水对应12ml过氧化氢。研究表明,当过氧化氢投加量超或低于12ml时,有机物降解的速率大幅下降。这是由于铁碳微电解后,水体中存在的亚铁离子可以充当催化剂,使得双氧水产生羟基自由基,提高了双氧水的氧化性能,提升了处理效果;但当双氧水投加量过多时,过量的双氧水会自身分解,并且会和羟基自由基产生反应,从而降低羟基自由基的含量,氧化有机物的反应变弱。Preferably, in the step S02, the dosage of hydrogen peroxide is: 12 ml of hydrogen peroxide per liter of benzhydroxamic acid production wastewater. Studies have shown that when the dosage of hydrogen peroxide exceeds or falls below 12ml, the rate of organic matter degradation is greatly reduced. This is because after the iron-carbon micro-electrolysis, the ferrous ions in the water can act as catalysts, so that the hydrogen peroxide generates hydroxyl radicals, which improves the oxidation performance of the hydrogen peroxide and improves the treatment effect; but when the amount of hydrogen peroxide added is too much, the excess Hydrogen peroxide will decompose itself and react with hydroxyl radicals, thereby reducing the content of hydroxyl radicals and weakening the reaction of oxidizing organic matter.

优选的,所述步骤S02中,铁碳比例为1:3。研究表明,当铁比碳多时,有机物降解的速率降低,铁碳微电解易在反应时发生板结和钝化,COD降解效果不明显。当碳比铁多,且铁碳比例为1:3时有机物降解速率最快,COD去除率最高。Preferably, in the step S02, the ratio of iron to carbon is 1:3. Studies have shown that when there is more iron than carbon, the degradation rate of organic matter is reduced, iron-carbon microelectrolysis is prone to hardening and passivation during the reaction, and the COD degradation effect is not obvious. When there is more carbon than iron, and the ratio of iron to carbon is 1:3, the organic matter degradation rate is the fastest, and the COD removal rate is the highest.

优选的,所述步骤S02中,铁碳的投加量为:每升苯甲羟肟酸生产废水对应160g的铁碳。研究表明,铁碳含量过高时,会导致铁氧化物发生聚集,使活性碳和铁之间的接触面积减小,从而影响处理效果。Preferably, in the step S02, the dosage of iron carbon is: 160 g of iron carbon per liter of benzhydroxamic acid production wastewater. Studies have shown that when the iron-carbon content is too high, iron oxides will aggregate, reducing the contact area between activated carbon and iron, thus affecting the treatment effect.

优选的,所述步骤S02中,铁碳微电解反应时间为1h。研究表明,当铁碳微电解反应时间超过1h时,苯甲羟肟酸生产废水中的有机物降解速率急剧下降,随后有增降,但COD去除率远没有铁碳微电解反应时间为1h时高。这是由于在反应初期,没有得到足够的电子还原苯甲羟肟酸生产废水,当反应不断进行时,水中的电子开始能够满足苯甲羟肟酸生产废水发生还原反应,然而,反应时间越长,铁表面会发生氧化而钝化,从而影响还原反应。Preferably, in the step S02, the iron-carbon micro-electrolysis reaction time is 1h. Studies have shown that when the reaction time of iron-carbon micro-electrolysis exceeds 1h, the degradation rate of organic matter in benzhydroxamic acid production wastewater drops sharply, and then increases and decreases, but the COD removal rate is far less than that when the reaction time of iron-carbon micro-electrolysis is 1h. . This is because in the early stage of the reaction, not enough electrons are obtained to reduce the waste water of benzhydroxamic acid production. When the reaction continues, the electrons in the water begin to satisfy the reduction reaction of the waste water of benzhydroxamic acid production. However, the longer the reaction time, the , the iron surface will be oxidized and passivated, thus affecting the reduction reaction.

作为优选,所述步骤S03中,加入氢氧化钙溶液将PH值调至7。研究表明,当铁碳微电解与苯甲羟肟酸生产废水反应的PH值呈酸性时,铁碳微型原电池的电位差大,氧化还原电位也加大,更有利于铁的溶解,产生大量的亚铁离子和还原态氢,加快了反应速率。当PH值为7时,铁碳微电解充分发挥了亚铁离子和铁离子的混凝作用,有机物降解速率最快,COD去除率最高。Preferably, in the step S03, calcium hydroxide solution is added to adjust the pH value to 7. Studies have shown that when the pH value of the reaction between iron-carbon micro-electrolysis and benzhydroxamic acid production wastewater is acidic, the potential difference of the iron-carbon micro primary battery is large, and the redox potential is also increased, which is more conducive to the dissolution of iron and produces a large amount of of ferrous ions and reduced hydrogen, speeding up the reaction rate. When the pH value is 7, the iron-carbon micro-electrolysis fully exerts the coagulation effect of ferrous ions and iron ions, the degradation rate of organic matter is the fastest, and the removal rate of COD is the highest.

优选的,所述步骤S03中,曝气时间为30-60min。研究表明,曝气时间30-60min时,有机物降解速率最大,COD去除率最高,且都基本相等。考虑到反应效率,且曝气的气泡会阻止铁碳与有机污染物的有效接触面积,故最优曝气时间为30min。Preferably, in the step S03, the aeration time is 30-60 min. Studies have shown that when the aeration time is 30-60min, the degradation rate of organic matter is the highest, and the removal rate of COD is the highest, and they are basically the same. Considering the reaction efficiency, and the aerated bubbles will prevent the effective contact area between iron carbon and organic pollutants, the optimal aeration time is 30min.

优选的,所述步骤S04中,沉降时间为4h。研究表明,由于苯甲羟肟酸生产废水跟铁碳微电解后,生产亚铁离子、铁离子,经水解形成氢氧化亚铁和氢氧化铁絮凝沉淀的网捕、卷扫去除有机物需要时间关,故沉降最优时间为4h。Preferably, in the step S04, the settling time is 4h. Studies have shown that, due to the micro-electrolysis of benzhydroxamic acid production wastewater and iron-carbon, the production of ferrous ions and iron ions, which are hydrolyzed to form ferrous hydroxide and ferric hydroxide flocculation and precipitation, the net capture and roll sweep to remove organic matter require time. , so the optimal settlement time is 4h.

本发明提供的一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,通过臭氧+铁碳微电解复合处理工艺,对苯甲羟肟酸生产废水进行处理。并通过每个实验数据的详细研究分析,得出最优的工艺数据,实现苯甲羟肟酸生产废水的高效处理。The invention provides a process for treating benzhydroxamic acid production wastewater by ozone iron-carbon micro-electrolysis, and the benzhydroxamic acid production wastewater is treated by an ozone + iron-carbon micro-electrolysis composite treatment process. And through the detailed research and analysis of each experimental data, the optimal process data is obtained to realize the efficient treatment of benzhydroxamic acid production wastewater.

以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1.一种臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于,包括以下步骤:1. an ozone iron carbon micro-electrolysis process for benzyl hydroxamic acid production wastewater, is characterized in that, comprises the following steps: S01、往苯甲羟肟酸生产废水通入臭氧,持续进行臭氧反应;S01, feed ozone into the benzohydroxamic acid production wastewater, and continue to carry out ozone reaction; S02、加入过氧化氢、铁碳混合试剂,搅拌均匀,持续进行铁碳微电解反应;S02, add hydrogen peroxide, iron-carbon mixed reagent, stir evenly, and continue to carry out iron-carbon micro-electrolysis reaction; S03、加入氢氧化钙溶液调节PH值,然后持续曝气;S03, add calcium hydroxide solution to adjust PH value, and then continue to aerate; S04、静置沉降,使铁碳微电解反应所得的氢氧化亚铁和氢氧化铁沉淀。S04, standing and settling, so that the ferrous hydroxide and ferric hydroxide obtained by the iron-carbon micro-electrolysis reaction are precipitated. 2.根据权利要求1所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S01中,臭氧反应时间60-120min。2. The process for treating benzhydroxamic acid production wastewater by ozone iron carbon micro-electrolysis according to claim 1, characterized in that: in the step S01, the ozone reaction time is 60-120min. 3.根据权利要求2所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S01中,臭氧的投加量为:每升苯甲羟肟酸生产废水对应6g/h。3. ozone iron carbon micro-electrolysis process according to claim 2 is characterized in that: in described step S01, the dosage of ozone is: every liter of benzhydroxamic acid production wastewater Corresponds to 6g/h. 4.根据权利要求1所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S02中,过氧化氢的投加量为:每升苯甲羟肟酸生产废水对应12ml过氧化氢。4. ozone iron carbon micro-electrolysis process according to claim 1 is characterized in that: in described step S02, the dosage of hydrogen peroxide is: every liter of benzhydroxamic acid The production wastewater corresponds to 12ml of hydrogen peroxide. 5.根据权利要求1所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S02中,铁碳比例为1:3。5. ozone iron carbon micro-electrolysis process according to claim 1 is characterized in that: in described step S02, iron carbon ratio is 1:3. 6.根据权利要求5所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S02中,铁碳的投加量为:每升苯甲羟肟酸生产废水对应160g的铁碳。6. ozone iron carbon micro-electrolysis process according to claim 5 is characterized in that: in described step S02, the dosage of iron carbon is: every liter of benzhydroxamic acid produces The waste water corresponds to 160 g of iron carbon. 7.根据权利要求4、5或6所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S02中,铁碳微电解反应时间为1h。7. The process for treating benzhydroxamic acid production wastewater by ozone iron-carbon micro-electrolysis according to claim 4, 5 or 6, characterized in that: in the step S02, the iron-carbon micro-electrolysis reaction time is 1h. 8.根据权利要求1所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S03中,加入氢氧化钙溶液将PH值调至7。8. ozone iron carbon micro-electrolysis process according to claim 1 is characterized in that: in described step S03, add calcium hydroxide solution and adjust pH value to 7. 9.根据权利要求8所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S03中,曝气时间为30-60min。9. The process for treating benzhydroxamic acid production wastewater by ozone iron carbon micro-electrolysis according to claim 8, characterized in that: in the step S03, the aeration time is 30-60min. 10.根据权利要求1所述的臭氧铁碳微电解处理苯甲羟肟酸生产废水工艺,其特征在于:所述步骤S04中,沉降时间为4h。10. The process for treating benzhydroxamic acid production wastewater by ozone iron carbon micro-electrolysis according to claim 1, characterized in that: in the step S04, the settling time is 4h.
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