At the sludge dewatering site, the most frustrating phenomenon is "soft core". The surface of the sludge cake just extracted through filtration seems dry and hard, but when it is broken open, it is found that the interior is still in a plastic-like state. Even after being placed for several days, the entire sludge cake begins to seep water again. This phenomenon is called "water return". This not only makes it impossible to effectively reduce the volume of the sludge, but also brings huge environmental risks to the subsequent transportation and disposal. In its long-term technical services, Works Chemicl Co., Ltd. has conducted in-depth analysis of this persistent problem and provided a cure solution.

The essence of the "soft core" phenomenon lies in the fact that the bound water in the sludge has not been completely released, and the internal structure of the sludge cake lacks effective support. When using traditional inorganic conditioning agents (such as lime), although a hard shell can form on the surface, the internal moisture is often encapsulated in fine flocs and cannot be discharged. Once the external pressure is removed or over time, the internal moisture will redistribute under capillary action and penetrate the surface, resulting in the sludge cake "re-evaporation". Moreover, if the dosage of the reagent is uneven and the local conditioning is inadequate, this kind of semi-cooked rice-like condition will also form.

To completely solve this problem, it is necessary to address it from two aspects: "de-gelling" and "framework". The solution proposed by Works Chemicl is centered around its unique "framework construction + deep de-gelling" technology. Firstly, Works Chemicl's special sludge enhancer has extremely strong permeability, which can penetrate deep into the sludge flocs and disrupt the EPS structure, "driving" the deep-bound water out to ensure consistent dehydration both inside and outside the sludge cake.

Secondly, to address the issue of loose mud cake structure, the sludge enhancer from Works Chemicl contains special framework materials. During the dehydration process, these materials will form a rigid porous network structure, supporting the framework of the mud cake. This framework not only enables the water to flow smoothly during the filtration process, but also maintains the porosity of the mud cake after the filtration is completed, preventing the mud cake from rebounding and absorbing water.

In a case of the renovation of a municipal wastewater treatment plant, the plant had long been plagued by the problem of "soft core" in the sludge. The moisture content of the sludge cake fluctuated greatly, often causing the vehicle to spill and drip. After introducing the customized solution from Works Chemicals, the technical team determined the optimal dosage of chemicals and the conditioning time through a beaker experiment. After the renovation, the sludge cake presented uniform granular shapes, with consistent dryness from the inside to the outside, and the moisture content remained below 55%, without any water return after being piled for one week.

Works Chemicl reminds customers that when encountering "soft core" problems, they should not blindly increase the filtration time. This approach often merely addresses the symptoms rather than the root cause. The key lies in choosing the right chemicals that can truly disrupt the sludge's colloidal structure and create an breathable framework.

Through Works Chemicl's professional conditioning, each sludge cake can truly achieve "inside and out consistency", completely eliminating the problem of backflow.