Landfilled civil sludge curing agent and deep dehydrating method thereof

Abstract

The invention discloses a landfilled civil sludge curing agent and a deep dehydrating method thereof and belongs to the field of civil sludge treatment. For landfilling the civil sludge, on one hand, a curing agent in a certain proportion is added before landfilling, so that the secondary deep dehydrating treatment difficulty is increased; on the other hand, a complicated biochemical reaction is performed on the landfilled sludge in an anaerobic environment, so that the moisture content is increased, and the sludge components become more complicated. For the characteristics of the landfilled civil sludge, the used curing agent contains carbide slag, sulfate aluminum cement, mineral powder, coal ash and an iron salt which are added by a certain sludge dry base percentage according to an adding sequence and stirring time to condition the sludge, and the dehydrating performance of the sludge is effectively improved, so that the colloidal particles in the sludge are destabilized and flocculated, a lot of water is removed, a basic condition for deep dehydration of the sludge is created, and the water content of a mud cake after dehydration can be reduced to 50-60%. The landfilled civil sludge curing agent disclosed by the invention solves the problem of deep dehydrating of the landfilled civil sludge, and the dehydrated sludge can be used as a resource. The curing agent is easy to obtain and low in cost.

Description

technical field [0001] The invention belongs to the field of sludge treatment, in particular to a solidifying agent for landfilled municipal sludge and a deep dehydration method thereof. Background technique [0002] A large amount of sludge will be produced in the process of sewage treatment, and its quality accounts for about 0.3%-0.5% of the treated water. By the end of 2015, the sludge output of urban sewage treatment plants in the country has reached more than 35 million tons per year. It is expected that by 2020, Sludge production will reach 60 million tons / year. At present, the most important methods of sludge disposal in the world include agricultural utilization, sanitary landfill, incineration, and ocean disposal. In my country, sludge treatment and disposal mainly use methods such as landfill, composting, drying, and incineration. These four The proportions of the two treatment methods are 65%, 15%, 6% and 3% respectively. Considering environmental benefits and e...

AI Technical Summary

Problems solved by technology

In this way, on the one hand, the landfill municipal sludge has been added with a solidifying agent, and it is more difficult to carry out further deep dehydration. On the other hand, complex biochemical reactions will occur in the landfill sludge pit, and the moisture content will increase again, and the sludge ingredients become more complex

At present, the research and application of curing agent and its dehydration method are mainly concentrated on river and lake sludge and fresh municipal sludge, and there is no precedent for the research on landfill municipal sludge curing agent and its deep dehydration method.

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