There are mainly several types of deodorants: physical deodorants, chemical deodorants, microbial deodorants, plant-based deodorants, and composite deodorants.

Physics class

Physical deodorants are used for deodorization through physical methods. They may not alter the physical properties of the odor, but only the local concentration, or relative concentration, of the odor without altering its components. Common ones include adsorption deodorants, masking deodorants, etc.

Adsorption deodorant

Adsorbable deodorants are deodorizing methods that use intermolecular van der Waals forces to adsorb odorous molecules into porous materials using substances with excellent adsorption capacity. Deodorants have a larger surface area and larger air capacity, and can usually adsorb and reduce the concentration of odor in the air to achieve the purpose of deodorization.

For example, "septic tank deodorant" uses a phosphorus free formula that, after atomization, forms a surface energy on the surface of small droplets. This surface can adsorb odor molecules in the air, and the dissolution process of odor gases involves a mass transfer process from gas phase to liquid phase, causing changes in the structure of odor molecules and making them unstable; At this point, useful molecules in the solution can supply electrons to odor molecules and react with them; Together, odor molecules adsorbed on the surface of droplets can also react with oxygen in the air. After the effect of this agent, odor molecules will generate odorless molecules such as nitrogen, water, etc.

Masking deodorants

Masking deodorants are substances such as aromatic oils and spices used to mask the odor. Mainly aimed at environments with difficult to remove odors or difficult to remove odors, mix several gases with gas levels in proportion to reduce the odor.

A tasteless masking agent with slow-release properties prepared using polymer microencapsulation techniques. The standard size of its microcapsules is 20-80. It can disperse excellently in aqueous liquids, and when added, it will not disrupt the formula balance of the liquid; The specific performance of the product together has a suppressive effect on the production of mold. Achieve the outstanding effect of killing two birds with one arrow.

Chemistry

Chemical deodorants use oxidation, reduction differentiation, neutralization reaction, addition reaction, condensation reaction, ion exchange reaction, etc. to convert the produced odorous substances into odorless substances and then eliminate the odor.

Oxidative deodorant

NaClO、 Chlorine and other oxidants oxidize sulfur and amines in the odor into compounds with lighter odor or higher solubility, and then absorb and purify them with acid and alkali.

Salt compounds

Using salt compounds as deodorants, such as divalent iron ions and ascorbic acid, to suppress oxidation and react with foul smelling substances such as ammonia and mercaptan to turn them into odorless substances; The coordination of trivalent iron derivatives and metal complexes reacts with thiols or sulfur to produce displacement reactions, converting odorous substances into odorless substances.

Acid and alkali preparations

The use of acidic or alkaline substances as deodorants, such as zinc oxide and hydrogen sulfide, produces non catalytic gas-solid two-phase reactions, which can remove hydrogen sulfide gas from the air; Flavonoids and tannic acid, as well as other wood essential oil components, undergo encapsulation, neutralization, and addition reactions to remove odorous substances.

Microbial type

In order to obtain candidate strains for use as deodorizing microbial agents, four strains with NH3 and H2S degrading abilities were separately screened from landfill leachate, labeled as CC3 and H2S degrading strains, respectively CC7, CC13, and CC16 were identified as Lactococcus acidilactici, Bacillus megaterium, Lactobacillus acidophilus, and Alcaligenes faecalis through morphological, physiological, biochemical, and 16S rDNA sequence analysis, respectively. Strain CC7 The deodorization efficiency of the composite combination composed of CC13 and CC16 is 1:1.5:0.5, with removal rates of NH3 and H2S of 83.56 and 70.25, respectively. Through single factor experiments, the deodorization conditions of microbial deodorants are confirmed: deodorization time is 60 hours, microbial dosage is 5, deodorization temperature is 30 ℃, and initial pH value of the culture medium is 6.5

The basic principle is to use microorganisms to absorb the odor substances in dissolved water into the microbial body, and through the metabolic activity of microorganisms, it is a process of degradation. Microbial deodorization can be divided into three stages:

① The dissolution process of foul smelling gases, that is, the transfer from the gas phase to the liquid phase;

② The odor components in aqueous solutions are adsorbed and absorbed by microorganisms;

③ The foul odor components that enter microbial cells are used as nutrients by microorganisms to differentiate and remove pollutants.

Article source: Deodorant manufacturer http://www.scneng.com.hk