Municipal sludge treatment has been a major challenge in urban environmental governance. Due to the large viscosity of municipal sludge, containing a large number of hydrophilic substances, dehydration is difficult, resulting in sludge collection, storage, transportation and utilization are greatly limited. As a chemical agent specially used to improve the dewatering performance of sludge, sludge enhancer can effectively solve this problem, so that "wet mud" can be quickly transformed into "hard".
One. Mechanism of action of sludge synergists
Sludge enhancer improves sludge dewatering performance mainly through the following mechanisms:
Damage the colloidal structure of the sludge: the sludge synergist can destroy the colloidal structure of the sludge, so that the sludge particles are easier to separate and dehydrate.
Reduce sludge viscosity: By reducing the viscosity of the sludge, the sludge synergist makes it easier to remove water from the sludge in equipment such as filter presses or centrifuges.
Improve sludge solid content: sludge enhancer makes it easier for solid particles in the sludge to gather together, thereby increasing the solid content of the sludge and reducing the water content.
Two. Main components and types of sludge synergists
The main components of sludge enhancer include inorganic compounds, sludge surface structure modifier, degreaser, wall breaking agent, sludge surface treatment agent, sludge stripping agent, etc. According to different sludge properties and treatment requirements, different types of sludge synergists can be selected.
Application effect of sludge synergist
Sludge enhancers have achieved remarkable results in municipal sludge treatment:
Improve dewatering efficiency: sludge synergists can significantly improve the dewatering efficiency of sludge and shorten the dewatering time. For example, combined with the use of plate and frame filter press, the sludge moisture content can be reduced from more than 90% to 40%-60%, and the dehydration efficiency can be increased by more than 30%.
Reduce treatment costs: Due to the improvement of dehydration efficiency, the sludge synergist reduces the running time and energy consumption of the dehydration equipment, and reduces the maintenance cost of the equipment. At the same time, the volume of the dehydrated sludge is reduced, which is convenient for subsequent transportation, storage and disposal.
Realization of sludge resource utilization: after dehydration, the water content of the sludge is reduced, the performance is stable, and it can be used as building materials, soil amendments and other resources.
Four, the use of sludge synergist precautions
Although sludge synergists have significant advantages, the following points still need to be noted during use:
Select the right sludge enhancer: Select the right sludge enhancer according to the nature of the sludge and treatment requirements. Different types of sludge enhancers have different chemical compositions and mechanisms of action, which need to be selected according to specific conditions.
Control dosage: The dosage of sludge enhancer should be adjusted according to the nature of the sludge and the performance of the treatment equipment. Too much or too little dosage may affect the treatment effect and economy.
Monitoring treatment effect: In the process of use, the dewatering effect and water content of the sludge should be regularly monitored to ensure the effectiveness of the sludge synergist.
Pay attention to environmental protection requirements: when selecting and using sludge enhancers, relevant environmental regulations and standards should be complied with to ensure that the treated sludge meets environmental protection requirements.
V. Case sharing
After the introduction of sludge enhancer in a sewage treatment plant, the dewatering efficiency of sludge has been significantly improved. The water content of the dehydrated mud cake is reduced from 80% to less than 60%, which not only improves the treatment efficiency of the sludge, but also reduces the treatment cost. This successful case proves the effectiveness and feasibility of sludge enhancer in municipal sludge treatment.
In summary, as an efficient and environmentally friendly sludge treatment agent, sludge enhancer plays an important role in municipal sludge treatment. Through rational use of sludge enhancer, rapid dewatering of sludge, reduction of treatment cost and promotion of sludge resource utilization can be achieved.