CN103482787A

CN103482787A - Processing method for lowering COD value of dyeing wastewater

Info

Publication number: CN103482787A
Application number: CN201310431027.1A
Authority: CN
Inventors: 夏志先
Original assignee: SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Current assignee: SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Priority date: 2013-09-22
Filing date: 2013-09-22
Publication date: 2014-01-01

Abstract

The invention relates to a processing method for lowering the COD (chemical oxygen demand) value of dyeing wastewater. The method comprises the following steps: firstly, adding 20-200 ppm Fenton agent and stirring for 2 to 5 minutes; then adding 50-500 ppm PAC (poly aluminium chloride) and stirring for 2 to 5 minutes; finally, adding 0.5 to 5 ppm negative ions and stirring for 10 to 20 minutes, precipitating for 10 to 20 minutes, filtering, and then measuring the COD value of water after filtering. The processing method provided by the invention has the benefits as follows: by adding the Fenton agent firstly, then adding the PAC for stirring, finally adding the negative ions for sufficient stirring, and then precipitating, the COD value can be measured, the method is simple to operate, a small occupied area for processing engineering is required, the process is short, the construction and the running costs are low, the treating effect is excellent, and secondary pollution is avoided.

Description

A kind for the treatment of process that reduces dyeing waste water COD value

Technical field

The present invention relates to wastewater processing technology, relate in particular to a kind for the treatment of process that reduces dyeing waste water COD value.

Background technology

Along with the quantity discharged of trade effluent increases day by day, after trade effluent not up to standard enters water body, can polluted surface water and underground water; Once water body is polluted, it is very difficult wanting to return at short notice original state, not only can make its water quality not meet the standard of tap water, fishery water, also can make chemical objectionable impurities and hardness in underground water increase, affect groundwater use, give directly or indirectly people's lives and healthyly bring harm.Particularly working as COD(refers under certain strict condition, when the quantity of the oxidized decomposition time institute's oxygen consumed agent under the effect of additional strong oxidizer of the reducing substances in water) very high, will increase the load for the treatment of process, for processing requirement, also increase accordingly, water outlet simultaneously is difficult to guarantee, if the situation that does not have the direct discharge for the treatment of unit to enter natural water, will cause the deterioration of natural water water quality; Reason is: self purification of water body need be these organic matter degradations, the degraded of COD needs oxygen consumption certainly, and the reoxygenation ability in water body can not meet the demands, in water, DO will directly reduce to 0, become anaerobic state, also will continue to decompose (anaerobic treatment of microorganism) at anaerobic state, water body will turn black, smelly (anaerobion is to seem very black, has hydrogen sulfide to generate); Final harm is exactly to enter natural water, destroys the water body balance, causes the death of nearly all biology except microorganism, further affects surrounding enviroment.The state of health of naturally living in the crowd under this environment will go from bad to worse; All contain a lot of volatility pungents in the trade effluent of general high COD, and these condensed ring aromatic compound prolonged stays are in human body, damage some specific histoorgan, such as being deposited on the vital tissue organs such as lung, kidney, or the infringement nervous function etc., for pregnant woman crowd, these materials are also the arch-criminals of teratogenesis tire.Therefore, the pollution of managing control and improvement waste water COD seems very important and urgent, in the method for existing treatment of dyeing and printing COD, the COD value of waste water is difficult to reduce, and complicated operation, process that the project occupation of land area is large, long flow path, capital construction and working cost is high, poor processing effect, have secondary pollution, need to effectively innovate prior art.

Summary of the invention

For above defect, the invention provides a kind of simple to operate, process that the project occupation of land area is little, flow process is short, capital construction and working cost is low, treatment effect is good, the treatment process of the reduction dyeing waste water COD value of non-secondary pollution, to solve the many deficiencies that have wastewater processing technology now.

For achieving the above object, the present invention is by the following technical solutions:

A kind for the treatment of process that reduces dyeing waste water COD value, the steps include:

(1) first add the Fenton reagent of 20-200ppm to stir 2-5 minute;

(2) add again the PAC polymerize aluminum chloride of 50-500ppm to stir 2-5 minute;

(3) last, add the negatively charged ion of 0.5-5ppm to stir 10-20 minute, precipitation 10-20 minute, filter, and surveys the COD value of water after filtering.

Described Fenton reagent value may be selected to be 65ppm, and simultaneously, the value of PAC polymerize aluminum chloride is chosen as 100ppm and added negatively charged ion is 3ppm.

Described Fenton reagent value may be selected to be 130ppm, and simultaneously, the value of PAC polymerize aluminum chloride is chosen as 100ppm and added negatively charged ion is 5ppm.

The beneficial effect of the treatment process of reduction dyeing waste water COD value of the present invention is: by first adding Fenton reagent, adding the PAC polymerize aluminum chloride stirs again, finally add negatively charged ion and fully stir, precipitate and measure COD value, the method is simple to operate, processing project occupation of land area is little, flow process is short, capital construction and working cost is low, treatment effect is good, non-secondary pollution.

Embodiment

embodiment 1

The treatment process of the described reduction dyeing waste water of embodiment of the present invention COD value mainly is comprised of following steps:

(1) first add the Fenton reagent of 65ppm to stir 2-5 minute;

(2) add again the PAC polymerize aluminum chloride of 100ppm to stir 2-5 minute;

(3) last, add the negatively charged ion of 3ppm to stir 10-20 minute, precipitation 10-20 minute, filter, and surveys the COD value of water after filtering.

embodiment 2

Mainly by following steps, formed:

(1) first add the Fenton reagent of 130ppm to stir 2-5 minute;

(3) last, add the negatively charged ion of 5ppm to stir 10-20 minute, precipitation 10-20 minute, filter, and surveys the COD value of water after filtering.

Above embodiment is more preferably embodiment several of the present invention, the common variation that those skilled in the art carry out in the technical program scope and replace and should be included in protection scope of the present invention.

Claims

1. a treatment process that reduces dyeing waste water COD value, is characterized in that, the steps include:

(1) first add the Fenton reagent of 20-200ppm to stir 2-5 minute;

2. the treatment process of reduction dyeing waste water COD value according to claim 1, it is characterized in that: described Fenton reagent value may be selected to be 65ppm, and simultaneously, the value of PAC polymerize aluminum chloride is chosen as 100ppm and added negatively charged ion is 3ppm.

3. the treatment process of reduction dyeing waste water COD value according to claim 1, it is characterized in that: described Fenton reagent value may be selected to be 130ppm, and simultaneously, the value of PAC polymerize aluminum chloride is chosen as 100ppm and added negatively charged ion is 5ppm.