Sludge dehydration curing agent and resource utilization method thereof

Abstract

A sludge dehydration curing agent comprises, by mass, 25 to 35 parts of diatomite, 10 to 20 parts of lignin, 5 to 10 parts of charcoal, 30 to 50 parts of silt and 2 to 8 parts of a slow release fertilizer. A resource utilization method of the sludge dehydration curing agent comprises the following steps: fully mixing the raw materials according to the components to obtain the sludge dehydration curing agent; taking a certain mass of sludge to dredge mud; mixing the sludge dehydration curing agent into the sludge dredging slurry, stirring to fully mix the slurry and the curing agent, and standing; dehydrating and drying the sludge obtained after standing; and maintaining the dehydrated sludge, and using the maintained sludge as greening planting soil. Original organic matters and nutritional ingredients in the sludge can be fully utilized, tail water generated in the sludge dewatering process is high in transparency, the PH ranges from 6 to 9, and the SS content is smaller than 10. The sludge dehydration curing agent hasa good application prospect in the field of lakeside sludge treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection technology engineering, and relates to a sludge dehydration curing agent and a resource utilization method. Background technique [0002] As the ecotone or transition zone of the lake's water and land ecology, the lakeside zone has the functions of intercepting pollutants, assimilating nutrient salts, improving water quality and controlling lake pollution, and is an important part of the ecological function of the entire lake. However, with the rapid development of the lake basin economy, the lakeside zone is affected by the construction of fish ponds, reclamation of lakes, fishermen's domestic sewage and feed, and the content of weeds such as hornwort, bitter grass and emergent plants at the bottom of the lakeside zone is high. And the growth is chaotic. Due to the special formation environment, compared with urban river silt, lakeside silt has serious eutrophication, poor fluidity, and v...

AI Technical Summary

Problems solved by technology

However, in the environmental protection dredging mud reduction treatment process, it is often necessary to add iron salts, calcium salts and other curing agents to condition the mud to quickly achieve the purpose of mud-water separation. However, this traditional curing agent not only changes the chemical properties of the sludge, making it The dehydrated sludge is strongly alkaline, and after dehydration, the sludge is compacted, the background is destroyed, and the water holding capacity is weakened. At the same time, the original rich organic matter and nutrients such as nitrogen, phosphorus, and potassium in the sludge are greatly reduced, and the resource utilization of subsequent sludge Cause huge obstacles, and the filtrate formed by sludge dehydration is highly alkaline, which will cause serious corrosion to equipment and increase the cost of subsequent water treatment

In addition, the disposal of sludge after dehydration is mainly in the form of simple foreign transport and stacking, which often results in a large waste of resources in the case of limited urban land area, and high transportation costs. At the same time, it will also lead to wetland drainage in the stacking area. The groundwater is lost, and the groundwater is polluted. With the expansion of the city, when the storage yard is developed in the future, the piled silt will be transferred to other places. Multiple transfers will inevitably consume a lot of social resources.

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