KR20140131665A

KR20140131665A - Inorganic powder flocculants for sewage and wastewater treatment and manufacturing methods

Info

Publication number: KR20140131665A
Application number: KR1020130050504A
Authority: KR
Inventors: 한명희
Original assignee: 한명희
Priority date: 2013-05-06
Filing date: 2013-05-06
Publication date: 2014-11-14

Abstract

The present invention relates to a flocculant for flocculating fine particles suspended in wastewater or wastewater, and more particularly, to an inorganic flocculant for minimizing secondary contamination due to flocculant and a method for producing the flocculant.
The present invention relates to a process for producing a zeolite comprising 16.2 to 16.8% by weight of zeolite (Na2Al2Si2O8), 62 to 68% by weight of raw plaster (CaSo4), 3 to 8% by weight of sodium oxide (NO2O) (Fe 2 O 2) 2 to 6 wt%, Bentonite (Clay) 1.7 wt.% To 2.2 wt.%, And ETC 2.3 wt.% To 2.7 wt.%. And the mixing and pulverizing process is repeated through a pulverizer in a storage tank to form powder particles of 300 mu m or less in powder form.

Description

Technical Field The present invention relates to an inorganic powder flocculant for sewage and wastewater treatment,

The present invention relates to a flocculant for flocculating fine particles suspended in wastewater or wastewater, and more particularly, to an inorganic flocculant for minimizing secondary contamination due to flocculant and a method for producing the flocculant.

Generally, the industry enjoys abundance due to the development of industries such as agriculture and animal husbandry industry. However, many wastewater generated by this causes serious problems such as water pollution, so it goes through a water treatment process before discharge. That is, various fine particles contained in the waste water and wastewater are flocculated and precipitated to separate out various contaminants.

The cause of water pollution is typically classified into inorganic substances such as suspended solids, ammonia, cyanide compounds, salts, heavy metal ions, and organic matters such as oil, carbohydrate, protein and phosphorus. As the coagulant, organic coagulant and inorganic coagulant are used. Recently used polychlorinated aluminum (PAC) and aluminum sulfate (Al2 (SO4) 3, l8H2O) among inorganic coagulants are polymers made of aluminum.

These coagulants should be dosed according to their amount when they are added to purify wastewater or wastewater, but this is only a theory. Actually, although the pollution degree of sewage or wastewater varies depending on various factors such as seasons, There is a problem that the coagulant itself causes secondary pollution due to the relative overdose.

In addition, according to a paper published in academia, coagulants such as aluminum sulfate (Alum) and polychlorinated aluminum (PAC) contain aluminum as a main ingredient. When the aluminum concentration is excessively consumed by the human body, Alzheimer's disease It is a fact that it is necessary to take countermeasures because it is attracting attention as a cause of neuronal fiber degeneration in neurons of brain diseases and high animals such as malignant senile dementia and seizures.

In addition, the method using aluminum sulfate has a problem that the treatment efficiency is relatively low. For example, when the COD of the raw sample was 410 ppm, the removal efficiency of organic substances using aluminum sulfate was found to be about 92% when using 800 ppm of aluminum sulfate. When the suspended solids concentration of the raw sample was 729ppm, the effluent removal efficiency of the wastewater was 88% when the aluminum sulfate as the coagulant was 800ppm, the suspension concentration was 88ppm. In addition, when aluminum sulfate is used to purify the water, there is a problem of contamination of the water due to the residual aluminum generated during the treatment.

When aluminum sulfate is used as the flocculant, the flocculant is liable to be fragile due to its weak strength, is light and slow in sedimentation rate, has a high water content, and is difficult to dehydrate.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention provides an inorganic powder coagulant for treating wastewater and wastewater, which has improved coagulation performance by preventing secondary contamination due to coagulant by removing aluminum component of coagulant, It has its purpose.

In order to achieve the above object, the present invention provides a method for producing an inorganic powder coagulant for treating wastewater and wastewater, which comprises 16.2 to 16.8 wt% of zeolite (Na2Al2Si2O8), 62 to 68 wt% of raw gypsum (CaSo4) 3 wt% to 8 wt% of magnesium (Mg), 2 wt% to 6 wt% of iron oxide (Fe 2 O 2), 1.7 wt% to 2.2 wt% of bentonite (Clay) To uniformly agitate the powder at a rate of 2.7 to 2.7% by weight, each powder was dried at a high temperature and then mixed and pulverized through a crusher in a storage tank at a high temperature and constant temperature and humidity to maintain powder particles of 300 μm or less in powder form It is characterized by a vacuum packaging box.

The inorganic powder coagulant for treating wastewater and wastewater according to the present invention has an effect of improving turbidity, eliminating odor and removing phosphorus, thereby preventing secondary contamination due to coagulant and improving flocculation performance.

Hereinafter, preferred embodiments of the inorganic powder flocculant for treating sewage and wastewater according to the present invention will be described in detail.

The inorganic powder flocculant for treating wastewater and wastewater according to the present invention comprises 16.2 to 16.8% by weight of zeolite (Na2Al2Si2O8), 62 to 68% by weight of raw plaster (CaSo4), 3 to 8% by weight of sodium oxide (NO2O) 3 wt% to 8 wt% of magnesium (Mg), 2 wt% to 6 wt% of ferric oxide (Fe3O4), 1.7 wt% to 2.2 wt% of bentonite (Clay), 2.3 wt% To uniformly stir 2.7 wt% of each powder, the powder was dried at high temperature and then mixed and pulverized through a pulverizer in a storage tank at a high temperature and constant temperature and humidity, and the powder particles were maintained in a powder shape of 300 μm or less, do.

At this time, the raw gypsum is stirred and pulverized at 100 to 150 ° C for 5 hours or more.

The powder thus mixed is further stirred and pulverized in a storage tank at a high temperature and constant temperature and humidity for 5 hours or more at 100 to 150 ° C to prepare an inorganic powder coagulant.

The raw gypsum powder and the zeolite powder can remove ammonia nitrogen components dissolved in water and various heavy metals through ion exchange. That is, it maintains the PH of wastewater stably and improves the sedimentation rate by improving the size of sludge particles. In addition, the mixture of bentonite helps adsorb heavy metals and inorganic metals and total phosphorus.

The process of treating wastewater using the powder coagulant prepared by the above method is as follows.

The raw water is moved through a Line Static Mixer and passes through an inorganic powder flocculant supply tank. The raw water and the inorganic powder flocculant are stirred at a mixing ratio corresponding to 1 / 10,000 and transferred to the treatment tank. The inorganic powder The coagulant binds with contaminants and suspended matter in the wastewater. The particles accelerate agglomeration by the attractive forces acting between the particles and precipitate at the bottom of the treatment tank.

Such sediments are used as materials for building materials and road construction after mechanical dehydration and incineration. Also, it is now reused as compost or fuel.

(Example 1)

In order to examine the performance of the coagulant produced by the production method according to the present invention, the total sedimentation rate of the PAC and the inorganic powder coagulant of the present invention was compared.

Raw water sample
PAC Inorganic powder coagulant 50 ppm
(input) 100ppm
(input) 10 minute settling 30 minute settling 60 minute settling 10 minute settling 1.332 (Tp) 0.49 (Tp) 0.285 (Tp) 0.214 (Tp) 0.264 (Tp)

As shown in the above experiment, it can be confirmed that the precipitation rate of the inorganic powder coagulant of the present invention is faster than that of PAC by 1/3.

Claims

A mixture of 16.2 wt% to 16.8 wt% of zeolite (Na2Al2Si2O8), 62 wt% to 68 wt% of raw plaster (CaSo4), 3 wt% to 8 wt% of sodium oxide (NO2O), 3 wt% The powders were dried at a high temperature and stored in a storage tank at a high temperature and constant humidity and humidified condition, and then pulverized by a pulverizer Wherein the particles of the powder are formed into a powder having a particle size of 300 탆 or less by repeating the mixing and pulverizing process.

A mixture of 16.2 wt% to 16.8 wt% of zeolite (Na2Al2Si2O8), 62 wt% to 68 wt% of raw plaster (CaSo4), 3 wt% to 8 wt% of sodium oxide (NO2O), 3 wt% The powders were dried at a high temperature and stored in a storage tank at a high temperature and constant humidity and humidified condition, and then pulverized by a pulverizer And stirring the mixture at 100 to 150 캜 for 5 hours or more and pulverizing the mixture to form powder particles having a size of 300 탆 or less.