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Method of producing polyacidic soil regulating agent using offscum in alkali manufacturing and city sludge

A technology for municipal sludge and alkali-making waste residue, which is applied in sludge treatment, soil conditioning materials, chemical instruments and methods, etc. Problems such as the decrease of soil available phosphorus content, to achieve the effect of enhanced drainage and moisture retention, easy handling and use, and growth promotion

Inactive Publication Date: 2006-11-29
广东省农业科学院土壤肥料研究所 +1
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Problems solved by technology

However, the content of water-soluble potassium and exchangeable potassium in soil decreased when lime was applied alone, and the content of available phosphorus in soil decreased with the increase of soil pH value.
Extensive or long-term application of lime will not only cause soil compaction and form "lime board field", but also cause imbalance of soil calcium, potassium, magnesium and other elements, resulting in crop yield reduction
Applying lime in acidic soil may also cause co-precipitation of magnesium and aluminum hydrated oxides, reducing the Mg in the soil solution. 2+ activity and phytoavailability of

Method used

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  • Method of producing polyacidic soil regulating agent using offscum in alkali manufacturing and city sludge

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[0027] The auxiliary material quicklime (CaO) treats the sludge with a weight ratio of 5% to 10%, and performs the process of alkalinity stabilization of the sludge. The reaction requires water, and the sludge contains a large amount of water (75-83%), which can be used as a source of raw water. The exothermic reaction makes the local temperature of the system reach 90-105°C, and the temperature is maintained at 52-70°C after thorough stirring and mixing. Make the sludge treatment system in a strong alkaline environment with pH ≥ 12, and keep it for at least 3 days, use the large amount of heat energy released by the strong alkaline lime to kill pathogens and parasites, reduce odor and passivate heavy metals. Add modifier monoammonium phosphate (NH4) to the alkali-making waste residue in a weight ratio of 10% to 22% 2 HPO 4 , and then put the harmless municipal sludge and modified soda residue in the compost bin for 10-14 days for aerobic composting. The amount of oxygen su...

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Abstract

A process for preparing a multi-element acidic soil conditioning agent from the alkali dregs and city sludge includes such steps as adding calcium lime to city sludge for stabilizing and disinfecting it, modifying the alkali dregs by (NH4)2HPO4, mixing them together, stacking to obtain compost, drying and breaking.

Description

technical field [0001] The invention relates to the technical field of environmental protection engineering, in particular to a method for simultaneously processing alkali-making waste residue and urban sludge to produce a multi-component acidic soil conditioner. technical background [0002] Environmental protection is a basic national policy of our country. With the development of economy and the continuous acceleration of urbanization, urban and rural industrial and agricultural wastes such as urban sludge and soda residue are polluting the environment more and more seriously. [0003] Municipal sludge is the product of urban domestic sewage after a series of treatment processes in sewage treatment plants. Taking Guangzhou City as an example, urban sludge contains 75% to 83% moisture, 23.45% to 57.09% organic matter, and all N, P 2 o 5 、K 2 O is 2.10%-5.33%, 0.59%-5.32%, 0.15%-3.15%, pH 5.6-8.8; it also contains a variety of trace elements, and most of the heavy metals ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C05G3/04C05F17/00C09K17/00C05G3/80
CPCY02W30/40
Inventor 黄庆林小明
Owner 广东省农业科学院土壤肥料研究所
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