CN104230117A - Pre-treatment method for nitrobenzene class industrial waste water - Google Patents
Pre-treatment method for nitrobenzene class industrial waste water Download PDFInfo
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- CN104230117A CN104230117A CN201410500890.2A CN201410500890A CN104230117A CN 104230117 A CN104230117 A CN 104230117A CN 201410500890 A CN201410500890 A CN 201410500890A CN 104230117 A CN104230117 A CN 104230117A
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Abstract
The invention relates to a pre-treatment method for nitrobenzene class industrial waste water and belongs to the field of waste water treatment methods. The pre-treatment method for nitrobenzene class industrial waste water comprises the following steps: after filtering the industrial waste water containing nitrobenzene class compounds, regulating the pH value by sodium hydroxide or hydrocloric acid, then adding a certain quantity of hydrogen peroxide and ferrous sulfate, carrying out reaction after uniformly agitating, and guiding the reacted waste water into a subsequent biological treatment technology. With the optimal pre-treatment method, the removing rate of the nitrobenzene class compounds is higher than 90.0%, the COD removing rate is higher than 60.0%, the chroma removing rate is higher than 80.0%, the COD and chroma of the pre-treated waste water are removed to an utmost extent, the biodegradability is greatly improved, and conditions are created for the subsequent biochemical treatment. The pre-treatment method for nitrobenzene class industrial waste water is simple in technology, convenient to operate and efficient.
Description
Technical field
The present invention relates to a kind of pretreatment process of nitrobenzene trade effluent, belong to method of wastewater treatment field.
Background technology
Nitrobenzene compounds is one of the organic pollutant of typical difficult for biological degradation 52 kinds of objectionable impuritiess belonging to priority acccess control in China environmental protection, and it has and causes prominent, teratogenesis and carinogenicity, to HUMAN HEALTH and biological existence very harmful.Pollutent nitrobenzene compounds content in the waste water of general pharmaceutical factory is comparatively large, adopts conventional flocculence, biological process etc. to be difficult to process.
Nitrobenzene compounds is extensively present in the trade effluents such as dyestuff, medicine, agricultural chemicals, explosive.The waste component of its discharge is complicated, and colourity is large, and COD content is high.Nitrobenzene compounds stable chemical performance, toxic to biology, belong to difficult for biological degradation organic compound, directly discharge is by polluted waters, destroy ecological, and the toxicity of nitrobenzene compounds to people is larger.Conventional flocculence, biological process etc. are difficult to process, for this reason, the trade effluent that first need carry out nitrobenzene for this type of trade effluent carries out pre-treatment, with first remove portion or most nitrobenzene compounds, for follow-up flocculence, Biochemical method provide favourable condition.
Therefore, study a kind for the treatment of effect p-nitrophenyl compounds that is applicable to that is good, that run simple and cost low to carry out pretreated method there is very high application prospect.
Summary of the invention
The present invention aims to provide the p-nitrophenyl class trade effluent that is applicable to that a kind for the treatment of effect is good, operation is simple and cost is low and carries out pretreated method.
The pretreatment process of nitrobenzene trade effluent of the present invention, comprises the following steps:
After trade effluent containing nitrobenzene compounds is filtered, pH value is regulated with sodium hydroxide or hydrochloric acid, add a certain amount of hydrogen peroxide and ferrous sulfate again, react after stirring, reacted waste water is introduced in follow-up Biochemical method technique.
Preferred, pH value of the present invention is 3.0, and hydrogen peroxide dosage is 30g/L, and the dosage of ferrous sulfate is 5g/L, and the reaction times is 40min.
In pretreatment process of the present invention, Feton reagent (i.e. hydrogen peroxide and ferrous sulfate) is adopted to have significant Degradation to the trade effluent containing nitrobenzene compounds in acid condition.
The oxidation system that hydrogen peroxide and catalyzer ferrous ion are formed is commonly referred to Fenton reagent.Fenton reagent method is a kind of homogeneous catalytic oxidation method.When adding hydrogen peroxide in containing the acidic solution of ferrous ion, under ferrous ion catalyst action, peroxidation Hydrogen Energy produces two kinds of active hydroxyl free radicals, thus causes and propagate radical chain reaction, accelerates the oxidation of organism and reducing substances.Confirm through great many of experiments, concentration of hydrogen peroxide changes has impact to the photodegradation of waste water, when hydrogen peroxide dosage is 30g/L, CODcr clearance is the highest, after 30g/L, CODcr clearance is on a declining curve again, this is because in certain concentration range, increase with concentration of hydrogen peroxide, by ferrous ion decompose-the OH that produces increase, oxidisability strengthens, but concentration of hydrogen peroxide is too high,-the OH produced just collided with each other and has regenerated hydrogen peroxide before not reacting with organism, thus on a declining curve again after degradation rate is occurred maximum value.When ferrous sulfate dosage is 5g/L, degradation rate is the highest, below or above 5g/L, degradation rate progressively declines this is because when ferrous ion concentration progressively increases, and it is progressively strengthened the Decomposition of hydrogen peroxide, improves the oxidation capacity of system, but ferrous ion concentration is too high, it can produce iron ion in the process of decomposition of hydrogen peroxide, and iron ion very easily exists with the form of Fe (OH) 2+, causes degradation rate to decline.Along with the increasing in reaction times, water outlet COD clearance also becomes large accordingly, but after reaction 40min, the clearance of water outlet COD does not almost increase, and illustrates that reaction terminates, so choosing 40min is optimum reacting time.
The pretreatment process of the best of the present invention, the clearance of p-nitrophenyl compounds is more than 90.0%, the clearance of COD is more than 60.0%, the clearance of colourity is more than 80.0%, and the COD of pretreated waste water and colourity have larger removal, and biodegradability is also greatly improved, for follow-up biochemical treatment creates condition, this method technique is simple, easy to operate, is a kind of pretreatment process of effective nitrobenzene trade effluent.
Embodiment
Embodiment one:
After trade effluent containing nitrobenzene compounds is filtered, pH value to 3.0 is regulated with sodium hydroxide or hydrochloric acid, add the hydrogen peroxide of 30g/L and the ferrous sulfate of 5g/L again, after stirring, carry out reaction 40min, reacted waste water is introduced in follow-up Biochemical method technique.
Embodiment two: treatment effect
Be used in pretreatment process of the present invention, pre-treatment is carried out to the trade effluent of certain nitrobenzene-containing compounds, measure the content of the nitrobenzene compounds before and after pretreatment reaction, COD and colourity.Treatment effect is as shown in Table-1:
Table-1 treatment effect
From table-1, pretreatment process of the present invention, the clearance of p-nitrophenyl compounds is more than 90.0%, the clearance of COD is more than 60.0%, the clearance of colourity is more than 80.0%, the COD of pretreated waste water and colourity have larger removal, and biodegradability is also greatly improved, for follow-up biochemical treatment creates condition.
Claims (2)
1. the pretreatment process of nitrobenzene trade effluent, comprises the following steps:
After trade effluent containing nitrobenzene compounds is filtered, pH value is regulated with sodium hydroxide or hydrochloric acid, add a certain amount of hydrogen peroxide and ferrous sulfate again, react after stirring, reacted waste water is introduced in follow-up Biochemical method technique.
2. the pretreatment process of nitrobenzene trade effluent as claimed in claim 1, it is characterized in that described pH value is 3.0, hydrogen peroxide dosage is 30g/L, and the dosage of ferrous sulfate is 5g/L, and the reaction times is 40min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410500890.2A CN104230117A (en) | 2014-09-26 | 2014-09-26 | Pre-treatment method for nitrobenzene class industrial waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410500890.2A CN104230117A (en) | 2014-09-26 | 2014-09-26 | Pre-treatment method for nitrobenzene class industrial waste water |
Publications (1)
| Publication Number | Publication Date |
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| CN104230117A true CN104230117A (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410500890.2A Pending CN104230117A (en) | 2014-09-26 | 2014-09-26 | Pre-treatment method for nitrobenzene class industrial waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104628202A (en) * | 2015-03-02 | 2015-05-20 | 沈阳工业大学 | Natural freezing-Fenton oxidation-coagulation combined method for treating TNT red water |
| CN105565466A (en) * | 2016-03-02 | 2016-05-11 | 清泽环境发展（北京）有限公司 | Efficient environment-friendly Fenton's reagent and method thereof for oxidizing and treating nitrobenzene |
-
2014
- 2014-09-26 CN CN201410500890.2A patent/CN104230117A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104628202A (en) * | 2015-03-02 | 2015-05-20 | 沈阳工业大学 | Natural freezing-Fenton oxidation-coagulation combined method for treating TNT red water |
| CN105565466A (en) * | 2016-03-02 | 2016-05-11 | 清泽环境发展（北京）有限公司 | Efficient environment-friendly Fenton's reagent and method thereof for oxidizing and treating nitrobenzene |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141224 |