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Method for treating sludge and method for recycling sludge building material and producing into fertilizer

A technology for sludge treatment and sewage treatment plants, applied in the direction of sewage/sludge fertilizer, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc. It can solve the problems of secondary pollution and high price of PAM, Achieve the effect of reducing the moisture content of sludge and improving the dewatering performance

Inactive Publication Date: 2009-10-28
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of PAM is relatively high, and the dried sludge will cause secondary pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: sludge treatment method

[0029] Include the following steps:

[0030] Step 10: The sewage treatment plant processes the collected sewage through the grid-grit chamber-primary sedimentation tank-biological treatment-secondary sedimentation tank to produce sludge water;

[0031] Step 12: The sludge water from the secondary sedimentation tank in the sewage treatment equipment has a water content of 96% to 98%. A certain amount of fly ash is added during the sludge settlement stage, and 250g to 1L of sludge water is added. 350g fly ash, the best embodiment is 1L sludge water plus 300g fly ash, then the sludge water and fly ash are stirred and mixed, stop still, so that the sludge settles rapidly;

[0032] Step 13: Use a pump to pump the settled sludge water to the sludge dewatering workshop, and the moisture content of the sludge water after dehydration by the filter press reaches 40% to 50%.

Embodiment 2

[0033] Embodiment 2: Recycling of sludge building materials:

[0034] Include the following steps:

[0035] Step 22: After the dehydrated sludge in the above-mentioned embodiment 1 is crushed, it is sieved to be below 5 mm;

[0036] Step 24: Sludge, binder (shale), and water are proportioned, wherein the weight ratios of each component are: 80% to 90% of sludge, 10% to 20% of binder, and water 15% to 25% of the total weight of sludge and binder, the mixture is stirred in a mortar machine for 2 to 5 minutes, and then extruded to form brick adobe. The best embodiment is that the weight ratio of sludge, binder and water is :85:12:20;

[0037] Step 26: Dry the adobe naturally until the strength reaches 2Mpa-4Mpa, and the moisture content is 1%-2%, and then it can be roasted;

[0038] Step 28: Put the dried bricks into the kiln for roasting, the temperature is controlled at 900-1000°C, the roasting time is 30-38 hours, the compressive strength reaches 15-16MPa, and the volume ma...

Embodiment 3

[0040] Embodiment three: sludge is used for agriculture:

[0041] Include the following steps:

[0042] Step 32: Perform an aerobic composting of the dehydrated sludge in the above-mentioned embodiment 1, and feed it to the sludge pile through a blower, so that the sludge is fermented for 14-16 days (d represents a day), and the sludge odor is weakened, which is the best Embodiment is good cultivation fermentation 15d;

[0043] Step 34: The second anaerobic composting fermentation, the sludge of the first aerobic fermentation is statically stacked, so that the sludge decomposes the organic matter that has not been completely decomposed by the first aerobic fermentation in an anaerobic state, and the sludge is stacked for 28--32d. The sludge odor is completely removed, and the best embodiment is stacking for 30 days;

[0044] Step 36: Dry to reach the moisture content of the decomposed sludge, because the fly ash contained in the sludge can not only absorb heavy metals in the...

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Abstract

The invention provides a sludge treatment method, which includes the steps of: using secondary sludge in the sewage treating apparatus, adding a certain mount of fly ash in the mud sedimentation stage, adding 250-350g of fly ash for 1L of mud water, and then stirring and mixing mud water and fly ash, standing still, causing mud to subside rapidly, and then pumping mud water after sedimentation into sludge dewatering workshop by pump, dewatering by filter press for obtaining mud water with moisture percentage 40-50%. Then the treated mud is used for burning building material product brick and fertilizer for agriculture. The methods provided by the invention have the advantages that: produced fly ash from electric power plant is added into a certain amount of mud water, without adding other materials, thereby improving dewatering performance of water plant mud significantly, reducing mud moisture percentage greatly, and the treated mud can be used for sintering building material product and applying in agriculture directly.

Description

【Technical field】 [0001] The invention relates to a sludge treatment method, in particular to a sludge treatment method and a method for recycling sludge building materials and making fertilizer. 【Background technique】 [0002] At present, the sewage treatment plant produces sludge water after the collected sewage is treated through the grid-grit chamber-primary sedimentation tank-biological treatment-secondary sedimentation tank; It is the water that can be discharged up to the standard. The sludge water from the secondary sedimentation tank is usually pumped to the sludge dewatering workshop for direct mechanical dehydration. This method has poor dehydration effect. In addition, in order to improve the dewatering performance of water plant sludge, an appropriate amount of polyacrylamide (PAM) is generally added to reduce the specific resistance of sludge before mechanical dehydration. However, the price of PAM is relatively high, and the dried sludge will cause secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F9/14C05F7/00C05F17/00C04B18/30
CPCY02A40/20Y02W30/40Y02W30/91
Inventor 刘心中翁仁贵陈艺兰
Owner FUJIAN UNIV OF TECH
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