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High-efficiency inorganic sludge dehydrating agent

A technology of inorganic sludge and dehydrating agent, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of poor pressure bearing capacity, secondary pollution, difficult to remove, etc., to suppress the generation of sludge odor and reduce operation. cost and the effect of reducing secondary pollution

Inactive Publication Date: 2011-09-14
TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the sludge contains a large amount of organic matter, there is currently a problem that the surface water of the organic matter cells and the water inside the cells are difficult to remove
Generally, the moisture content of the sludge after concentration and dehydration is still above 80%. If further dehydration is required, it generally needs to be treated by heating, resulting in complicated processes and high treatment costs. In addition, the sludge with such a high moisture content is soft and sticky. Perishable and smelly, bulky, poor pressure bearing capacity, there are many problems such as difficult operation, secondary pollution, high energy consumption, etc. in the process of loading, transportation and disposal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the proportions of the components of Example 1 in Table 1, the materials were taken and uniformly mixed to prepare 8 kg of wet powdery inorganic sludge dehydrating agent. The dehydrating agent is mixed with 100Kg of sewage plant sludge with a moisture content of 70% with a mixer; then centrifuged with a rotary centrifuge at 2000 rpm for 40 minutes, and the sludge moisture content drops to 45% , The dehydration efficiency is 35.7%.

Embodiment 2

[0028] According to the proportions of the components of Example 2 in Table 1, the materials were taken and uniformly mixed to prepare 1 Kg of wet powdery inorganic sludge dehydrating agent. Mix the dehydrating agent with 100Kg of sewage plant sludge with a moisture content of 80% with a mixer, and centrifuge at a speed of 2500 rpm for 40 minutes with a rotary centrifuge. The moisture content of the sludge drops to 50%. The efficiency is 37.5%.

Embodiment 3

[0030] According to the proportions of the components of Example 3 in Table 1, the materials were taken and mixed uniformly to prepare 3Kg of wet powdery inorganic sludge dehydrating agent. Mix the dehydrating agent with 100Kg of sewage plant sludge with a water content of 99% with a mixer, and centrifuge at a speed of 2500 rpm for 40 minutes with a rotary centrifuge. The water content of the sludge drops to 45%. The efficiency is 54.5%.

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Abstract

The invention relates to a high-efficiency inorganic sludge dehydrating agent, which is characterized by consisting of the following components in percentage by weight: 25-50 percent of sodium chloride, 35-60 percent of magnesium chloride, 1-10 percent of ferric chloride and 1-5 percent of concentrated sulfuric acid with the concentration of 98 percent. The dehydrating agent has the advantages that: a remarkable dehydrating effect is achieved, moisture accumulated in sludge can be quickly separated out, the structure of an organic matter is damaged, microorganisms in sludge are dehydrated and deactivated, the aim of stabilizing dehydration is fulfilled, the generation of sludge odor is suppressed and secondary pollution is reduced; and in particular, the dehydrating agent is prepared from inorganic raw materials, so that the cost is low, the treatment cost of the sludge can be lowered greatly, produced waste water can be recycled by concentrating, standing and drying, environmental hazard is avoided and water resource is saved.

Description

Technical field [0001] The invention relates to a sludge dewatering agent in the technical field of sewage, waste water and sludge treatment, and in particular to a high-efficiency inorganic sludge dewatering agent used in the secondary dewatering process of dewatered sludge in a sewage plant. Background technique [0002] The mixed sludge produced by domestic sewage treatment and the biological treatment sludge produced by industrial wastewater are typical organic sludges with a large amount. The sludge output of a medium-sized sewage plant with a treatment scale of 100,000 tons / day is about 600 tons. Taking Shanghai as an example, the primary wastewater treatment volume is 3.71 million tons per day, and 22,260 tons of sludge are produced per day. The above-mentioned high water content sludge needs to be concentrated and dewatered. At present, there are many sludge dewatering agents and dewatering methods: [0003] The patent number is: "ZL200410050738.5" The invention patent tit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 马建立邓小文卢学强赵由才王金梅
Owner TIANJIN ACADEMY OF ENVIRONMENTAL SCI
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