Hebei Messi Biology Co., Ltd. stated that in aquaculture, odor caused by hydrogen sulfide and other sulfur-containing organic compounds produced by long-term accumulation of sludge due to frequent feeding or long-term desilting is a common problem. Using magnesium hydroxide or magnesium oxide as the treatment agent can provide a suitable pH range (8.5~9.0) and can last for a long time. The product magnesium sulfate dissolves in water without any harm. Using magnesium hydroxide to remove hydrogen sulfide from water is an implementation plan with easily available resources, environmental friendliness, technological feasibility, economic rationality, simple operation, and safe operation. It has a history of at least 15 years abroad, whether it is sewage treatment It performs very well in factories, sewers, and aquaculture applications.
The mechanism of action of magnesium hydroxide
When the organic matter in the sludge at the bottom of the aquaculture farm decays and decomposes, this area is in an anaerobic state. As a result, the anaerobic Thiobacillus sulfate-reducing bacteria (English abbreviation SRB, the same below) can grow and have considerable activity, which can reduce sulfate into hydrogen sulfide (H2S). In most cases the H2S generated from bottom sludge is produced by SRB. In other words, SRB can only breed and reproduce in weakly acidic water. When the pH value of the water body is greater than 8.5 (usually 8.5 ~ 9.0), SRB cannot survive. Therefore, spreading magnesium hydroxide into the bottom sludge will increase the pH of the water above 8.5. Although the solubility of magnesium hydroxide is very small, the rate of dissociation into magnesium ions and hydroxide ions is continuous. As long as there is sufficient dosage, the weak alkalinity of the water body will remain for a long time, which can inhibit the growth of SRB. , thereby eliminating the generation of hydrogen sulfide.
It can be known from the above chemical reactions:
1, Above the water level in the sewer, hydrogen sulfide is oxidized into sulfuric acid by Thiobacillus, which is the cause of corrosion;
2, Below the water level, sulfate is reduced by SRB to generate hydrogen sulfide;
3, After adding magnesium oxide, magnesium oxide reacts with water to form magnesium hydroxide. H2S is adsorbed by magnesium hydroxide to form a solid solution, which is further decomposed into magnesium hydrogen sulfide and oxidized to form magnesium sulfate, which is neither odor nor corrosive. The generated magnesium sulfate is also a trace element supplement that is easily absorbed by fish, shrimps and crabs. One of the main ingredients of the calcium and magnesium products we usually supplement is magnesium sulfate.
The important impact of magnesium on fish, shrimps and crabs
Magnesium is a component of chlorophyll of some bacteria. Although it does not participate in the composition of any cell structure substances, its ion state is used by many important enzymes (such as hexose phosphorylase, isocitrate dehydrogenase, carboxylase, etc.) of activators. Magnesium ions can improve the tolerance of some aminoglycoside antibiotic-producing bacteria (such as kanamycin, streptomycin, novobiocin, etc.) to the antibiotics they produce. At the same time, magnesium ions can work together with sodium ions and potassium ions to maintain the balance of intracellular and intracellular osmotic pressure, alleviate the response of aquatic animals to heat stress, thereby increasing the food intake of fish, shrimp and crabs in high-temperature weather, and reducing the heat caused by high-temperature fish, shrimps and crabs. stress response.
Hebei Messi Biology Co., Ltd. recommends that in the case of heat stress, the amount of magnesium oxide in the diet should be increased to compensate for the loss of magnesium in the body, so as to ensure and maintain normal body balance. And magnesium is a component of chlorophyll, which is needed by various algae. Magnesium plays an important role in glucose metabolism. Plants require more magnesium during the fruiting process. Without magnesium, the net synthesis of ribonucleic acid (RNA) will stop, nitrogen metabolism will be disordered, and carbohydrates and unstable phospholipids will accumulate in cells. Magnesium deficiency can also affect calcium absorption.