Dehydrating agent, preparation method thereof, organic fertilizer and preparation method thereof

Abstract

The invention discloses a dehydrating agent, a preparation method of the dehydrating agent, organic fertilizer prepared by using the dehydrating agent, and a preparation method of the organic fertilizer. The dehydrating agent contains stove ash and / or silicon acid cement, quick lime and calcium chloride and / or magnesium chloride, wherein the ratio of the weight of the stove ash and / or the silicon acid cement to the weight of the quick lime and to the weight of the calcium chloride and / or magnesium chloride is (4-12):(3-8):1. The preparation method of the organic fertilizer comprises the following steps of mixing sludge, plant waste and high temperature resisting aerobic bacteria, and conducting stacking fermentation on the obtained mixture till the moisture content of the mixture is reduced to be less than 40% by weight, wherein the stacking fermentation is conducted on the presence of the dehydrating agent. The dehydrating agent disclosed by the invention is rapid in dehydration speed; by preparing the organic fertilizer by using the sludge, not only is the problem that the resource utilization of the sludge is difficult solved, but also the problem of organic fertilization shortage is solved, so that the dehydrating agent has a wide application prospect; and the organic fertilizer contains organic substances and nutrition and is high in fertilizer efficiency.

Description

Technical field [0001] The invention relates to a method for preparing a dehydrating agent, a dehydrating agent prepared by the method, an organic fertilizer prepared by using the dehydrating agent and sludge, and a preparation method thereof. Background technique [0002] The dehydrating agents conventionally used in stacking fermentation mainly include physical adsorption dehydrating agents (such as silica gel, clay, molecular sieves, etc.) and chemical dehydrating agents (such as magnesium chloride, calcium chloride, soda lime and silicic acid, etc.), used alone or simply When the dehydrating agent is mixed and used in stack fermentation, the dehydration speed is relatively slow, and it takes 20-40 days for stack fermentation to reduce the moisture content of the sludge to below 40% by weight. [0003] Organic fertilizers are mainly derived from plants and (or) animals, and are carbonaceous materials that are applied to the soil to provide plant nutrition as their main function....

AI Technical Summary

Problems solved by technology

However, each of these treatment methods has its own disadvantages: landfill needs to occupy a large amount of land, and landfill waste gas emissions are likely to cause secondary pollution; sludge incineration can carbonize all organic matter and kill pathogens, with a large treatment capacity and small footprint. Minimize the volume of sludge, but the investment in incineration treatment equipment is large, the treatment cost is high, and it will also cause secondary pollution; although throwing into the sea is the simplest and requires less cost, it will cause great damage to the ecological environment, and countries have banned it ; Sludge can be used as agricultural fertilizer after natural composting, which is an environmentally friendly and economical treatment method, but sludge fertilizer has disadvantages such as inconvenient use and poor fertilizer efficiency, which makes it unable to compete with chemical fertilizers, and in recent years people have become more and more interested in green food. With the improvement of requirements and the vigilance of soil pollution, the agricultural standards of sludge fertilizers are becoming increasingly stringent, and it is difficult to meet the agricultural standards only through natural composting, which makes the use of sludge as agricultural fertilizers unsustainable

[0006] A large amount of plant waste is produced in industrial production processes such as food processing plants and brewing industries. Generally, these plant wastes such as cassava slag are used as cheap roughage, but the nutritional value of plant waste is low, so it is not the best roughage. choice, so there is also a need to develop another method of effectively treating or utilizing plant waste

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