Method and system for synergistically solidifying dewatered sludge and raw sludge

Abstract

The invention discloses a method for synergistically solidifying dewatered sludge and raw sludge. The method comprises the following steps: step 1, performing primary mixing on the raw sludge, mediumsand and solidification auxiliary materials under stirring, and performing preliminary solidification to obtain preliminarily-solidified sludge; and step 2, performing secondary mixing on the preliminarily-solidified sludge and the crushed dewatered sludge under stirring, and performing synergistic solidification to obtain solidified sludge. The invention also discloses a system for synergistically solidifying the dewatered sludge and the raw sludge. The method provided by the invention has the advantages of good treatment effects, a simple process, easy promotion and low costs, and can be used for large-scale processing; and the system has a simple structure, low costs, easy operation and good treatment effects.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method and system for synergistically solidifying dewatered sludge and raw sludge. Background technique [0002] Municipal sludge is a kind of biomass debris produced in the sewage treatment process of urban sewage treatment plants, with high moisture content and complex components. If a large amount of municipal sludge is not properly disposed of, it will cause serious pollution to the environment. [0003] According to the "four modernizations" requirements for sludge treatment and disposal, the current municipal sludge treatment technologies mainly include sanitary landfill, anaerobic digestion, aerobic composting, dry incineration, etc. "anaerobic digestion + deep dehydration" technology plays an important role in sludge reduction It has great advantages in terms of utilization (reduction degree of more than 60%), resource utilization (recycling of biomass energy ...

AI Technical Summary

Problems solved by technology

The water content of the sludge can be reduced to less than 60% after plate and frame dehydration, but the pure physical extrusion dehydration can only reduce the volume of the sludge, and cannot completely change the properties of the sludge. When the dewatered sludge meets water, it is easy to absorb water, resulting in the deterioration of its mechanical indicators , easy to slide, poor stability

The conventional disposal method of dewatered sludge is to enter the landfill and fill with domestic waste. The dewatered sludge entering the landfill is easy to absorb the moisture of the garbage and the surrounding environment, resulting in an increase in the moisture content of the sludge, deterioration of mechanical indicators, and stronger fluidity. Affect the stability of the landfill pile; the dewatered sludge is easily dispersed into the leachate infiltration system after absorbing water, and the heavy metals and sludge particles in the sludge are easy to dissolve, which makes the treatment of the back-end leachate more difficult, affecting the efficiency of influent water removal and Emission indicators are stable. At the same time, the dewatered sludge is scattered into the garbage dump, which is easy to block the biogas discharge gap, resulting in poor biogas collection and potential safety hazards.

[0006] After the plate and frame dewatered sludge is crushed, the volume is still large (diameter greater than 10cm). If it is mixed with the curing agent, only the surface layer undergoes hydration and curing reaction, and the binding force is not strong, resulting in poor overall curing effect, and the water absorption and mechanical indicators are not good. Significant improvement

In addition, when a large amount of curing agent is used for the plate and frame dewatered sludge, the disposal cost will be increased, the weight and volume of the sludge will be increased, and the economy and environmental protection will be poor.

Images