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A kind of residual activated sludge drying treatment process

A technology of residual activity and treatment process, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve the problem of limited drying efficiency and achieve rapid dehydration, Effect of improving dehydration efficiency

Active Publication Date: 2020-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the invention does not pretreat the sludge, and the drying efficiency is limited

Method used

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  • A kind of residual activated sludge drying treatment process
  • A kind of residual activated sludge drying treatment process
  • A kind of residual activated sludge drying treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0030] It is basically the same as Example 1, except that the treatment agent is polyether-modified trisiloxane of 1% TS sludge and the concentration of 0.1% TS sludge is 15% ethylenediaminetetraacetic acid, and adding 0.2% The properties of polyoxin and nikkomycin in TS sludge are shown in Table 2 after wall-breaking and dehydration, and the moisture content of the remaining sludge after final drying dropped to 10.2%.

[0031] Table 2 Analysis table of sludge properties

[0032]

Embodiment 3

[0034] It is basically the same as that of Example 1, except that the inlet temperature of the solar multi-layer mesh belt type low-temperature drying box, the amount of carrier gas and the residence time in the box are adjusted. After dehydration, the mud cake enters the filter press to be pressed into 3mm strips. The sludge enters the solar multi-layer mesh belt low-temperature drying box through the conveyor belt. The carrier gas is heated to 70°C by the solar tube, the humidity in the box is 5%, and the carrier gas volume is 800m 3 / h, the sludge stays in the tank for 4 hours, and the moisture content of the sludge drops to 12.7% after drying.

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Abstract

The invention discloses a drying treatment process for excess activated sludge. According to the treatment process, the excess activated sludge is fed into an electrolytic cell firstly, a treating agent and an auxiliary are added to the electrolytic cell, treatment is performed for 1-2 h under conditions of 0-20 mA / cm<2> and 200-500 HZ, then the sludge is fed into a sludge dewatering machine for dewatering, a dewatered sludge cake and sewage are obtained, the sewage is sent to a sewage plant for further treatment, the dewatered sludge cake is fed into a forming machine to be extruded into strips, the strips enter a solar multi-layer mesh belt type low-temperature drying box through a conveyor belt for drying, and dried sludge with water content lower than 15% is obtained. With adoption ofthe process, water content of the excess activated sludge can be reduced to 15% or lower from 97% or higher, sludge volume is reduced greatly, and the dried sludge can serve as a raw material for further recycling or be incinerated.

Description

technical field [0001] The invention relates to a wall-breaking and drying treatment process for excess activated sludge, in particular to a wall-breaking dehydration and low-energy-consumption drying treatment process for excess sludge. Background technique [0002] With the improvement of my country's environmental quality standards, the rate and degree of sewage treatment have increased year by year, and the amount of excess activated sludge has also increased sharply. Excess activated sludge is an inevitable product in the process of sewage treatment. Its composition is complex. It is composed of bacterial micelles formed by various microorganisms and organic matter adsorbed. In addition to containing a large amount of water, it also contains refractory organic matter, volatile substances, and heavy metals. and salts, as well as pathogens and parasite eggs, etc., must be handled and disposed of in time to avoid secondary pollution. [0003] The excess sludge has a high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/127C02F11/122C02F11/123C02F11/13C02F11/147
CPCC02F11/12C02F11/121C02F11/14
Inventor 吴巍回军冯文龙李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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