With the rapid development of society and the increasing urban population, our city has a large amount of sewage every day, and the black and smelly sludge formed after sewage treatment is also increasing year by year. The source of sludge is the residue of a large number of harmful bacteria in the sewage sludge "sludge is the residue of sewage treatment, to say that the sludge must first understand the composition of sewage. Taking domestic sewage as an example, just washing dishes, bathing, and going to the toilet, each of us produces an average of 100 liters of sewage per day.

Because sewage carries a large number of microbial pollution sources, such as E. coli, influenza bacteria, etc., we must treat sewage. In the sewage treatment process, these pollutants will be consumed into dead microorganisms, hidden in the sludge of a large number of harmful bacteria, if not effectively treated, spread will affect the human body and the environment.

There are many problems in sludge treatment

It is understood that sludge treatment faces many problems:

1, high moisture content (75% ~ 99%)

2, high organic content, perishable, smelly, polluting the environment.

3, the sludge contains parasitic eggs, pathogenic microorganisms, difficult to degrade harmful substances.

4, the transportation cost is high, stacking covers a large area.

5, odor pollution of the environment, while emitting greenhouse gases to the atmosphere (20 times more than carbon dioxide).

6, containing heavy metals, if uncontrolled use, pollution of the land, resulting in irreversible degradation of arable land;

Whether it is landfill or incineration, it will encounter problems such as site selection difficulties and secondary pollution. Therefore, it is necessary and urgent to find effective ways to reduce sludge production.

How to deal with the secondary pollution caused by sludge? How does it work? We went to a sludge disposal plant in Anhui province to find out.

Aerobic fermentation technology gives sludge a new way out

The high temperature aerobic fermentation technology in the realization of sludge stabilization, harmless, reduction at the same time, can reduce the cost of sludge treatment and operating costs, to meet the environmental standards, corresponding to solve the current problems encountered in sludge treatment.

Anhui this sludge disposal plant is the use of high temperature aerobic fermentation technology, the person in charge of the site said: "According to the process, the sludge by adding the corresponding auxiliary materials through the forklift is transported to the NCS intelligent molecular membrane fermentation system for harmless treatment." During the whole process, the sludge will not cause any pollution to the environment, so we can not smell any odor. After high temperature fermentation, pathogens and harmful substances hidden in the sludge will be all eliminated, so that the sludge can be harmless."

NCS intelligent molecular membrane fermentation system is a process technology for transforming organic waste resources through high temperature aerobic fermentation. Using e-PTFE membrane material, the water vapor and carbon dioxide generated during the fermentation process can be spread out from the microporous structure of the functional membrane by using its one-way permeability characteristics, while external liquid water (rain, snow) can not enter the membrane. Through aeration, a micro-positive pressure inner cavity is formed in the fermentation body, thus maintaining the airflow balance inside and outside the fermentation pile membrane, achieving a more constant climate environment, ensuring that the aerobic fermentation is carried out more fully and thoroughly, the pathogenic microorganisms are effectively killed, the moisture content of the sludge is effectively reduced, the fermentation efficiency of the sludge is improved, and the production cycle is shortened.

The tank static fermentation is adopted to solve the disadvantages of the limited stacking height, the large amount of space occupied and the total amount of sludge disposal restricted in the traditional stack fermentation. Static fermentation also does not require the traditional stack fermentation to frequently turn the sludge, greatly reducing the mechanical turning, reducing equipment maintenance, diesel fuel use problems; The equipment is simple to operate, reducing the on-site construction of operators, only 1 to 2 supervisors or safety officers to supervise the production and operation, reducing labor costs.

In front of rows of fermentation tanks, the person in charge of the site introduced that "the sludge here uses NCS intelligent molecular membrane fermentation system after high temperature aerobic fermentation to achieve the stabilization and resource of the sludge, and the generated nutrient soil can be used for landscaping, flower planting, mine restoration, etc., from the original black and smelly sludge new way out, transformed into fertile soil."

This technology not only makes urban sludge become a renewable resource, but also fundamentally solves the secondary pollution caused by improper use of sludge containing harmful substances such as pathogenic bacteria. Truly achieve the "sludge reduction, harmless, stable, resource, productization of the multi-effect goal, while contributing to the urban ecological environment, but also for urban development to provide nutritious soil resources." It not only has better economic benefits, but also has good social benefits, ecological environmental benefits and demonstration effects.