Sewage deodorization purifying agent and preparation method thereof and sewage deodorization method

A purification agent and sewage technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as unstable pH value, chemical burns, and inconvenient operation to avoid safety accidents and industrial accidents, prevent heavy metal pollution, and avoid the effect of increased activity

Active Publication Date: 2020-01-07
捷艾悉环保科技(上海)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The emission of sulfide can lead to the following problems: firstly, sulfide (such as hydrogen sulfide) will corrode the concrete of sewage pipes; secondly, hydrogen sulfide is a toxic gas, which is dangerous to sewer workers; secondly, hydrogen sulfide has obvious odor, which is harmful to Production and life have adverse effects
The method of adding lime water is generally put in the sludge section of the sewage plant, but the pH value of the sludge is unstable after the lime water is put in, and it rises or falls quickly. If the pH value is too high, a large amount of ammonia pollution will be generated, and then the pH value will drop Sooner, hydrogen sulfide will continue to be emitted
Sodium hydroxide is generally put in before the sewage plant enters the plant, but sodium hydroxide also has the problem of unstable pH value, which rises or falls quickly. If the pH value is too high, a large amount of ammonia pollution will be generated, and then the pH value will drop rapidly and then will lead to the continued emission of hydrogen sulfide
Moreover, the treatment process of most sewage plants in my country is AAO biological treatment system, and if the pH value is too high, it will seriously affect the survival of the flocculant group.
In addition, no matter whether it is lime water or sodium hydroxide, the corresponding solution needs to be prepared on site, which is inconvenient to operate, and it is easy to cause chemical burns, safety accidents and work-related accidents

Method used

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Examples

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Effect test

preparation example Construction

[0034] A preferred preparation process of the scavenger comprises: 1) adding water in the reactor, adding magnesium oxide while stirring, when the temperature is below 95°C (such as 65-95°C), adding an organic acid, and continuing to stir (continuously stirring time such as about 30 minutes); 2) add the suspending agent afterwards, and keep stirring (for example, about 40 minutes for continuous stirring time); 3) add flocculant after that, keep stirring (for example, about 30 minutes for continuous stirring time); 9.5-10.5.

[0035] In some specific and preferred embodiments, in terms of weight percentage, the raw material formula of the purifying agent includes magnesia 10-60%, organic acid 0.04-0.125%, suspending agent 0.013-0.5%, and flocculant 0.01-0.5%, Others are water;

[0036] Further, the magnesium oxide raw material preferably has a purity ratio of magnesium oxide greater than 90%, and silicon dioxide lower than 0.5%. It should be noted that in actual production, t...

Embodiment 1

[0049] A purifying agent for sewage deodorization, prepared through the following steps:

[0050] Add water in the reaction kettle, add magnesia while stirring, add 150 parts by weight of water for every 100 parts by weight of magnesia, after fully reacting, when the temperature drops to 90°C, add organic acid (75% glacial acetic acid) 1 1 part, stirred for 30 minutes; then added 1 part of suspending agent (hydroxypropyl methylcellulose, viscosity specification: 15,000mPa.s), stirred for 40 minutes, then added 1 part of low molecular weight cationic polyacrylamide flocculant, stirred for 30 minutes . The final scavenger concentration was 58% and the pH was about 9.8.

[0051] The obtained purifying agent was used in the sludge thickening tank of a sewage plant in Shanghai, and the daily dosage rate ranged from 25mg / L to 95mg / L based on the amount of sludge water. pH and hydrogen sulfide were monitored over a period of one week. Before the purification agent is put in, the h...

Embodiment 2

[0053] A purifying agent for sewage deodorization, prepared through the following steps:

[0054] Add water in the reaction kettle, add magnesia while stirring, add 500 parts by weight of water for every 100 parts by weight of magnesia, after fully reacting, when the temperature drops to 70°C, add organic acid (75% glacial acetic acid) 1 1 part, stirred for 30 minutes; then added 1 part of suspending agent (hydroxypropyl methylcellulose, viscosity specification: 15,000mPa.s), stirred for 30 minutes, then added 1 part of low molecular weight cationic polyacrylamide flocculant, stirred for 30 minutes . The final scavenger concentration was 24% and the pH was about 9.6.

[0055] The obtained purifying agent was used in the sludge thickening tank of a sewage plant in Shanghai, and the daily dosage rate ranged from 150mg / L to 300mg / L based on the amount of sludge water. Hydrogen sulfide was monitored over a period of one week. Before the purification agent is put in, the pH valu...

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Abstract

The invention discloses a purifying agent suitable for sewage deodorization, a preparation method of the purifying agent suitable for the sewage deodorization and a sewage deodorization method. The purifying agent is a solid-liquid mixture, the pH value of the purifying agent is 9.5 to 10.5 and the purifying agent comprises the components of magnesium hydroxide, organic acid, a suspending agent and water, wherein the mass content of magnesium hydroxide is 10 to 80%, and the mass content of the suspending agent is 0.001 to 5%. The preparation method of the purifying agent comprises the following steps: making magnesium oxide and water hydrate in the presence of the organic acid to form magnesium hydroxide, then adding the suspending agent and a selective flocculant, and uniformly mixing. The sewage deodorization method refers to continuously putting the purifying agent disclosed by the invention to sewage. The sewage is deodorized by using the purifying agent, the pH value of the sewagecan be kept stable (the fluctuation range is less than 0.5), and the deodorizing effect is maximized. In addition, the purifying agent disclosed by the invention is safe and harmless and good in fluidity, can be directly put into use, and is convenient to use.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a purifying agent with sewage deodorizing effect and a preparation method thereof, and also relates to a sewage deodorizing method. Background technique [0002] With the development of the economy, the discharge of living and production sewage is increasing, which brings great pressure to the environment. An important component that causes pollution in domestic and industrial sewage is sulfide. Sulfate in water is reduced to sulfide by sulfate reducing bacteria (SRB). The emission of sulfide can lead to the following problems: firstly, sulfide (such as hydrogen sulfide) will corrode the concrete of sewage pipes; secondly, hydrogen sulfide is a toxic gas, which is dangerous to sewer workers; secondly, hydrogen sulfide has obvious odor, which is harmful to Production and life have adverse effects. Several factors in sewage including pollution components, biofilm, sed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/56C02F1/62
CPCC02F1/00C02F1/56C02F1/62C02F2303/02
Inventor 张明海肯特雷蒙德约翰
Owner 捷艾悉环保科技(上海)有限公司
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