Hydrolytic acidification --Hidden Contributors of Sewage Treatment

In the process of modern urbanization, sewage treatment has become an important part of environmental protection. Hydrolysis acidification process, as a key step in biological treatment technology, silently plays an indispensable role on the road of sewage purification. It can be said that it is an invisible contributor to sewage treatment! In this paper, the principle and characteristics of hydrolysis acidification process and its application in sewage treatment will be discussed in depth.

one 、 Principle of hydrolysis acidification process

Sewage integrity Anaerobic biological treatment The process is divided into three stages, and the hydrolysis acidification process is controlled at the end of the first stage or the beginning of the second stage of the anaerobic decomposition process.

Hydrolysis acidification is a biochemical process, which mainly occurs in the pretreatment stage of sewage treatment. In this process, complex organic substances, such as proteins, fats and carbohydrates, are decomposed into simpler organic acids, alcohols and gases by microorganisms. This process can be divided into two stages: hydrolysis and acidification.

one Hydrolysis stage: microorganism decomposes macromolecular organics into small soluble organics such as amino acids, sugars and fatty acids by secreting enzymes.

two Acidification stage: these small molecule organics are further metabolized by microorganisms to produce organic acids (such as acetic acid, propionic acid), alcohols and gases (such as carbon dioxide and methane).

II Characteristics of hydrolysis acidification process

one Non aerobic environment: hydrolysis acidification process is usually carried out under anoxic or anaerobic conditions, which means that it does not need additional oxygen supply, reducing energy consumption.

two Strong adaptability: hydrolysis acidification process can treat various types of organic wastewater, including high concentration and refractory organics.

three Improve biodegradability: through hydrolysis and acidification, the structure of complex organics is destroyed, improving the efficiency of subsequent biological treatment stages (such as aerobic treatment).

III Application of hydrolytic acidification in sewage treatment

one Pretreatment: Hydrolysis acidification is often used as the pretreatment step of sewage treatment, which creates favorable conditions for subsequent treatment by reducing the complexity of organic matter.

two Improve treatment efficiency: in some cases, hydrolytic acidification can be combined with other biological treatment technologies (such as activated sludge process) to improve the efficiency of the whole treatment system.

three Resource recovery: organic acids and other substances produced in the process of hydrolysis and acidification can be recycled as energy to realize the recycling of sewage treatment.

IV Classification of hydrolysis acidification reactors

According to the flow pattern in the reactor, it can be divided into Push flow hydrolysis reactor and upflow hydrolysis reactor are two types.

1） The plug flow hydrolysis reactor is in the plug flow reactor. The installed mixing device is used to realize mixing in the reactor, so the mixing effect is good. It is a typical fully mixed reactor. However, this type of reactor needs to add sedimentation because of the complete mixing of mud and water The pond separates the treated sewage from the anaerobic sludge, and returns the settled sludge to the hydrolysis reactor to maintain the reaction The sludge concentration in the reactor accelerates the hydrolysis process.

2) Upflow hydrolysis reactor The higher upflow velocity in the upflow hydrolysis reactor suspends the sludge and realizes the mixing of sludge and reactants. The sludge in the upflow reactor is retained in the reactor through its own sedimentation performance, so there is generally no sedimentation tank later, so the power consumption is low.

 

Conclusion: Although hydrolysis acidification process is not well known, its role in sewage treatment is crucial. Through this process, we can not only effectively purify sewage, but also realize the recycling of resources and contribute to the construction of a sustainable society. In the future, with the continuous progress and innovation of technology, hydrolysis acidification process will play a more important role in the field of environmental protection.