Method for producing fertilizer by utilizing mud and plant straws

A plant straw and sludge technology, applied in the direction of sewage/sludge fertilizer, organic fertilizer, fertilizer mixture, etc., can solve the problems of high water content in filtrate, peculiar smell of carbon disulfide, etc., and achieve simple operation, short reaction time, and save land occupation Effect

Inactive Publication Date: 2010-03-03
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent literature, application number: 96122252.2 reports that sodium sulfide, carbon disulfide and a small amount of sodium pyrophosphate, tetrabutylate additives are mixed with sludge from urban sewage treatment plants, and heat treated at 80-85°C and 90-95°C for 1 hour respectively , 1.5 to 2 hours, then filter, the filtrate is further processed to obtain the so-called organic acid fertilizer, the filter residue is discarded after sintering, the water content of the filtrate obtained by this method is too high, and the reaction raw material carbon disulfide used has peculiar smell
To sum up, there is no report on the method of using straw and sludge mixture to produce fertilizer in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 200 kg of activated sludge (water content 76%) produced by an organic wastewater treatment plant of a pharmaceutical company, add 10.5 kg of solid ammonium sulfite, stir evenly, then add 40 kg of crushed dry wheat straw, stir evenly, and put it into a cooking tank , heated to 140-150°C with high-pressure steam, and then kept for 3h. Stop heating, naturally cool to room temperature, release the slurry obtained by cooking, and obtain 102 kilograms of granular organic fertilizer products by spraying and granulating. The indicators of the product are: the appearance is black, the organic matter is 65.4%, the total nutrient (N+P 2 o 5 +K 2 O) 9.8%, humic acid 11.3%, sulfur (S) 2.8%, moisture 14.6%.

Embodiment 2

[0021] Take 200 kilograms of activated sludge (water content 80%) produced by the sewage treatment of a slaughter enterprise, add 10.2 kilograms of solid sodium sulfite, stir evenly, then add 30 kilograms of cotton stalk powder that has been crushed and passed through a 20-mesh sieve, stir evenly, pack Put it into the cooking tank, keep the steaming ball rotating at a slow speed, heat it to 160-170°C with high-pressure steam, and then keep it at this temperature for 2 hours. Stop heating and turning, and when it is cooled to about 100°C, release the slurry obtained by cooking, transfer it to the cooling pool and drop to room temperature, then add -4- 30 kg of urea containing 46% nitrogen (N), containing Phosphorus (P 2 o 5 ) 46% TSP 20 kg, containing potassium (K 2 (0) 15 kilograms of potassium chloride of 60%, after hot air drying, obtain 158 kilograms of granular organic-inorganic compound fertilizer products by mechanical extrusion granulation. The index of the product i...

Embodiment 3

[0023] Get 200 kilograms of activated sludge (water content 82%) produced by an organic wastewater treatment plant of a brewing enterprise, add 7 kilograms of solid sodium sulfite, stir evenly, and then add 20 kilograms of dried corn stalk powder that is crushed and passed through a 20-mesh sieve (water content rate of 5.2%), stir evenly, put into the cooking tank, keep the cooking tank rotating at a slow speed, heat to 130-140° C. with high-pressure steam, and keep for 5 hours. Heating and rotation were stopped, and when the temperature had dropped to near room temperature, the cooked slurry was placed in a storage tank. Then, separate it into filtrate and filter residue with a centrifuge equipped with a 60-mesh filter cloth. The filtrate thus obtained was about 153 kg. Add 15 kilograms of industrial potassium sulfate, stir and dissolve to obtain 168 kilograms of potassium humate liquid fertilizer. The prepared liquid fertilizer appearance is a tan viscous liquid, the humic...

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Abstract

The invention discloses a method for producing a fertilizer by utilizing mud and plant straws, mainly comprising the following steps with the mixture of concentrated mud and plant straw powders as theraw material and one or a plurality of ammonium sulfite, sodium sulfite and potassium hydrogen sulfite as the stewing decay agent: the stewing decay agent accounting for 8-15 percent of the reduced dry weight of the raw material and the raw material are mixed uniformly, and are stewed at the temperature of 125-170 DEG C for 2-7 hours to obtain the semi-finished product of slurry organic fertilizer which can be directly prepared into commercial organic fertilizer; or appropriate amount of chemical fertilizers such as nitrogen, phosphor, kalium and trace elements are added into the semi-finished product to prepare organic-inorganic composite fertilizer; or the semi-finished product is separated to prepare an organic kalium liquid fertilizer and an organic ammonium liquid fertilizer. The method has simple technology, the decay conversion speed of raw materials is fast, and the purposes of sterilizing, decontaminating and deodorizing the raw material can be realized with the method; the product has high organic content and humic acid content, is sulfur-bearing, and has high fertilizer efficiency; and with the method, the large-scale and low-cost fertilizer utilization of the mud and plant straw waste is realized.

Description

technical field [0001] The invention relates to a method for producing fertilizer by using a mixture of sludge and plant straw, and belongs to the technical field of resource utilization and pollution prevention and control. Background technique [0002] With the development of industry and cities, the discharge of industrial and urban domestic sewage is gradually increasing, and the organic wastewater is mainly treated by biological methods, resulting in a rapid increase in the amount of sludge produced. How to solve the way out of sludge treatment and disposal has become a major environmental problem to be solved urgently in the process of industrial and urban development in various countries. It is known that the main component of sludge is cellular organic matter, and also contains nitrogen, phosphorus, potassium and various trace elements, and the water content is generally 70% to 85%. Crop straw is a biomass agricultural waste with many types and a very large amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05G1/00C05F7/00
CPCY02A40/20
Inventor 马子川李素卫简广福
Owner HEBEI NORMAL UNIV
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