Method for improving dry weight reduction and dehydration performance of organic waste

Abstract

The invention provides a method for improving dry weight reduction and dehydration performance of organic waste. The method comprises steps as follows: firstly, a pretreating agent is prepared from organic raw materials for later use; then, the organic waste is weighed and poured into a reactor, and the pretreating agent is added to the reactor, mixed and stirred uniformly; the reactor is closed, and heating is started for a pre-reaction; after thermal insulation is finished, an exhaust valve of the reactor is turned on, gas produced during the pre-reaction is completely exhausted, the exhaust valve is turned off, a gas charging valve is turned on again, reducing gas is charged into the reactor, and inside pressure of the reactor is increased; gas charging is stopped, and the gas charging valve is turned off; heating is continued, and a second reaction starts; after the second reaction ends, a product is cooled to the normal temperature, the reactor is opened, the reacted solid-liquid mixture is dehydrated, and a mud cake is obtained. The catalytic gas release function of the organic pre-treatment agent is comprehensively utilized, dissolution of the organic waste is promoted, reductive and catalytic reactions are realized, the dry weight reduction effect and the dehydration performance of the organic waste are notably improved, and energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of organic waste treatment, and in particular relates to a method for significantly improving the dry weight reduction effect and dehydration performance of organic waste by adding a high-efficiency pretreatment agent. Background technique [0002] Organic waste refers to waste sludge with high water content (40%-99%) organic matter accounting for more than 30% of inorganic components, such as kitchen waste, organic waste residue in the spraying industry, organic high-boiling residue, pharmaceutical synthetic waste residue and sewage treatment The remaining sludge produced by the factory, etc. With the rapid development of social economy, more and more industrial wastewater is produced. According to statistics, in 2015, the total amount of wastewater discharge in my country was as high as 73.53 billion tons, of which the total amount of industrial wastewater discharge accounted for about 27.1% of the total,...

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Problems solved by technology

For example, deep dehydration technology uses chemical conditioning to improve the dehydration performance of waste sludge, and only water is finally released, which has no effect on the dry matter of organic waste (CN103319066B); there are also some technologies that can achieve the effect of reducing the dry weight of organic waste , but the effect is very low and the cost is large

For example, anaerobic digestion technology is generally not efficient in treating waste sludge, and the equipment cost and investment cost are high, the dehydration effect of waste sludge is poor, and the flammable gas produced by anaerobic digestion may also have safety risks ( China Construction News. There are still many problems to be solved urgently in the anaerobic digestion of sludge [J]. Water Supply and Drainage Dynamics, 2011(6): 46.)

Another example is the thermal hydrolysis technology, which is prone to short-flow of steam in the process of processing organic waste, resulting in uneven heating of waste sludge in the thermal hydrolysis tank, which makes the heating time of thermal hydrolysis longer and consumes more energy. (CN 104891766B)

In addition, the technology of alkalization cracking and mud acidification is used to treat organic waste. The dry weight reduction effect of organic waste is not more than 20%, and its pretreatment time is relatively long, which makes waste sludge treatment efficiency low (CN 103964657B)

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