Method for dehydrating and conditioning sludge and preparing raw materials of slow-release fertilizer

A sludge dehydration and slow-release technology, which is applied in the preparation of organic fertilizers, dehydration/drying/concentrated sludge treatment, organic fertilizers, etc., can solve the problems of unreached, secondary pollution of the environment, and large land occupation. Good effect, water content reduction effect

Active Publication Date: 2011-09-14
INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by the trend of "heavy water and light mud" in my country's sewage treatment industry, the problem of sanitary and harmless treatment and disposal of sludge has not been paid attention to and solved. At present, most of the sludge in my country is discarded or landfilled. The treated sludge has not reached the relevant environmental protection discharge standards, and at the same time, it needs to occupy a large amount of land, and it also causes serious secondary pollution and new environmental problems

Method used

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  • Method for dehydrating and conditioning sludge and preparing raw materials of slow-release fertilizer
  • Method for dehydrating and conditioning sludge and preparing raw materials of slow-release fertilizer
  • Method for dehydrating and conditioning sludge and preparing raw materials of slow-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Sludge (with a water content of about 80%), water-absorbing clay minerals, and plant slag are mixed in a ratio of dry matter weight ratio of 1:0.3:1, and composted according to conventional aerobic composting methods, wherein water-absorbing clay minerals are respectively made of sodium-based bentonite and attapulgite Soil and plant dregs are respectively tea dregs, tobacco powder, and pineapple processing waste dregs. Measure the temperature of the heap during composting, and measure the moisture, organic matter, nitrogen, phosphorus and potassium content of the heap after 15-20 days of fermentation. The test results are shown in Table 1:

[0024] Table 1 Comparison of moisture and nitrogen, phosphorus and potassium contents after mixed fermentation of different materials

[0025]

[0026]

Embodiment 2

[0028] Sludge (about 80% water content), calcium-based bentonite, cassava residue or pineapple processing waste residue are mixed according to the ratio of dry matter weight ratio 1: 0.1-0.5: 0.5-1.0 (Table 2), and composted according to conventional aerobic composting methods. Measure the temperature of the heap during composting, and measure the moisture, organic matter, and nitrogen, phosphorus, and potassium contents of the heap after 15-20 days of fermentation. The test results show that mixing in the above proportions can achieve good results.

[0029] Table 2 Comparison of compost moisture and nitrogen, phosphorus and potassium content in different mixing ratios

[0030]

Embodiment 3

[0032] Sludge (about 80% water content), water-absorbing clay minerals, and pineapple residue are mixed in a ratio of 1: 0.3: 1 by weight of dry matter. The ratio of dry matter weight to other materials) adding magnesium-containing alkaline substances, compounds or materials containing phosphate and ammonium ions, and water-absorbing polymer compounds for conditioning, after mixing, determine the content of moisture, nitrogen, phosphorus, and potassium.

[0033] Table 3 Effects of different conditioners on compost moisture and nutrients

[0034]

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Abstract

The invention relates to a method for preparing a slow-release fertilizer, in particular provides a method for dehydrating and conditioning sludge and preparing raw materials of the slow-release fertilizer. The method particularly comprises the following steps of: adding water-absorbing clay minerals, a mixture of water-absorbing macromolecular compounds and plant residues to dehydrated sludge ineach cubic meter, composting and fermenting for 10-15 days according to a conventional method, sequentially adding compounds formed by phosphoric acid radicals and ammonium ions and magnesium-containing alkaline substances in fermentation products, and mixing uniformly to obtain the raw materials for producing a slow-release type organic-inorganic compound fertilizer. The method for dehydrating and conditioning the sludge and preparing raw materials of the slow-release fertilizer, disclosed by the invention, is suitable for large-scale sludge dehydration treatment and also provides high-nutrient raw materials for the manufacturing of the slow-release fertilizer.

Description

technical field [0001] The invention relates to a method for making a slow-release fertilizer, in particular to a method for sludge dehydration conditioning and making a slow-release fertilizer raw material. Background technique [0002] With the strengthening of the country's environmental governance, more and more sewage plants in our country are put into operation, and more and more sludge is produced. Affected by the trend of "heavy water and light mud" in my country's sewage treatment industry, the problem of sanitary and harmless treatment and disposal of sludge has not been paid attention to and solved. At present, most of the sludge in my country is discarded or landfilled. The treated sludge has not met the relevant environmental protection discharge standards, and at the same time, it needs to occupy a large amount of land, and it also causes serious secondary pollution and new environmental problems. Realizing sludge reduction and resource utilization and reducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C05F17/00
CPCY02W30/40
Inventor 彭智平杨少海操君喜黄继川李文英于俊红林志军杨林香
Owner INST OF AGRI RESOURCES & ENVIRONMENT GUANGDONG ACADEMY OF AGRI SCI
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