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Urban water-treatment sludge resource utilization method

A water treatment and recycling technology, applied in the field of environmental engineering, can solve problems such as poor air permeability and water retention, fine phosphogypsum particles, and land occupation, and achieve the effects of improving fertilizer utilization, improving soil environment, and saving costs

Inactive Publication Date: 2016-11-09
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphogypsum has small particles, poor air permeability and water retention, strong acidity, pH value between 1 and 4.5, and its main component is CaSO 4 2H 2 O, w(CaSO 4 ) is 91% to 93%, and the mass fraction of sulfur trioxide is generally 40% to 45%. It also contains undecomposed phosphate rock, a small amount of unwashed phosphoric acid, calcium chloride, iron, aluminum, silicon compounds, and acid insoluble matter , organic matter and other trace impurities, these impurities cause the utilization rate of phosphogypsum to be only 2% to 3%.
Stacking phosphogypsum not only occupies a large amount of land, but also causes environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for producing organic fertilizer from phosphogypsum-activated sludge, the preparation steps are as follows: first, take 10 parts by weight of sludge and place it in a high-speed mixer, and simultaneously add 5 parts by weight of rice-washing water to carry out high-speed stirring for 20 minutes , and mix evenly; then put the aforementioned mixed solution into the aeration tank for aeration treatment, stop the aeration after the flocs are formed, and initially form activated sludge; then heat and evaporate 10 parts of the papermaking black liquor into a solid state, and then mix with 9 parts of vermiculite are mixed and placed in a calciner, calcined at 750°C for 2 hours, taken out and crushed for later use; then 5 parts by weight of wood chips are added to the aforementioned activated sludge, and 5 parts by weight of straw are stirred by a mixer After uniformity, it is sent to the fermentation bin for fermentation. During the fermentation process, the compost is...

Embodiment 2

[0035] A method for producing organic fertilizer from phosphogypsum-activated sludge, the preparation steps of which are as follows: a method of producing organic fertilizer from phosphogypsum-activated sludge, the preparation steps of which are as follows: first, 15 parts by weight of sludge are placed in In the high-speed mixer, add 7 parts by weight of rice washing water at the same time and carry out high-speed stirring for 25 minutes, and mix evenly; Form activated sludge; then heat and evaporate 15 parts of papermaking black liquor into a solid state, mix with 10 parts of vermiculite and place in a calciner, calcinate at 750°C-850°C for 2-3 hours, take it out and pulverize it for later use; The aforementioned activated sludge is added with 7 parts by weight of sawdust, 7 parts by weight of straw is evenly stirred by a mixer, and then sent to the fermentation bin for fermentation. The fermentation process uses pile turning and stirring, turning pile once a day, and ferment...

Embodiment 3

[0037] A method for producing organic fertilizer from phosphogypsum-activated sludge, its preparation steps are as follows: a method for producing organic fertilizer from phosphogypsum-activated sludge, its preparation steps are as follows: first take 13 parts by weight of sludge and put it in In the high-speed mixer, add rice washing water with 7 parts by weight at the same time and carry out high-speed stirring for 23 minutes, and mix evenly; Form activated sludge; then heat and evaporate 15 parts of papermaking black liquor into a solid state, then mix with 9 parts of vermiculite and place in a calciner, calcined at 800°C for 2 hours, take it out and pulverize it for later use; then add the aforementioned activated sludge Add 6 parts by weight of wood chips, and 6 parts by weight of straw are evenly stirred by a mixer and then sent to the fermentation bin for fermentation. The fermentation process uses pile turning and stirring, turning the pile twice a day, and fermenting f...

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Abstract

The invention discloses an urban water-treatment sludge resource utilization method. The method comprises the following steps: adding rice washing water into urban water-treatment sludge and mixing and carrying out aeration treatment, and preliminarily forming a floccule so as to obtain activated sludge; adding wood chip and broken straw into the activated sludge and uniformly mixing, and sending the mixture into a fermentation tank and fermenting; sending the fermentation product into a composting bin and composting; drying the composted product, adding phosphogypsum and mixing, heating to 50-55 DEG C and processing for 2-3h, cooling and adding polylactic acid and uniformly stirring; mixing papermaking black liquor and vermiculite and calcining, coating a product obtained in the above step with the calcined powder, air-drying, crushing, granulating, and sieving to obtain an organic fertilizer used for improvement of saline lands. The organic fertilizer is used for improvement of saline lands and beneficial to growth of crops. Meanwhile, soil environment can be effectively improved; air permeability, water retention and fertilizer maintenance capabilities of soil are enhanced; soil hardening is prevented; utilization rate of the fertilizer is raised; fertilization frequency is reduced; and costs are saved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a resource utilization method of urban water treatment sludge. Background technique [0002] Municipal water treatment sludge is a flocculent sediment produced in the process of urban sewage treatment. It is a solid waste composed of inorganic particles, animal and plant residues, organic matter, microorganisms, insect eggs, colloids and other complex components. In addition, sewage The sludge also contains a large number of pathogenic microorganisms, parasite eggs and harmful plant seeds. Its main characteristics are high moisture content (above 85%), high organic matter content, perishable and smelly, and pose a threat to public health safety. [0003] Phosphogypsum is a solid waste discharged during the production of phosphate fertilizer and phosphoric acid. About 4.5-5 tons of phosphogypsum is produced for every 1 ton of phosphoric acid produced...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05F17/00C05G3/80
CPCC05F5/004C05F17/00C05G3/80C05G5/30C05F7/00C05F11/00C05G1/00Y02W30/40
Inventor 袁军邹杨别雨檬吴广文程健
Owner WUHAN INSTITUTE OF TECHNOLOGY