Process for improving dewaterability of excess biochemical sludge

A technology for excess sludge and dewatering performance, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of large investment, low engineering applicability, and difficult scale application and other issues to achieve the effect of improving processing capacity, shortening the fermentation cycle, and promoting rapid proliferation

Active Publication Date: 2014-08-20
知和环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In response to this phenomenon, researchers at home and abroad have done a lot of research and exploration on sludge anaerobic pretreatment technology, including: pyrolysis method, chemical method, mechanical metho

Method used

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  • Process for improving dewaterability of excess biochemical sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] This process is used for batch treatment of excess sludge in the laboratory. The treated sludge is the remaining sludge produced by an oxidation ditch process in Zhengzhou to treat urban domestic sewage, with a moisture content of 98% and a specific resistance of 46×10 12 m / kg, the moisture content of the mud cake is 89%; the sewage to be dosed is the sewage treated by the treatment plant; the anaerobic granular sludge inoculated is taken from the IC reaction tank of a certain treatment plant. The specific steps are attached figure 1 shown.

[0017] 1) Acidification of muddy water: Mix 500mL of sludge and 500mL of sewage from the sewage treatment plant in a 1000mL beaker, and carry out hydrolytic acidification pretreatment under the condition of stirring with a six-connected mixer, the stirring speed is 70r / min, and the reaction temperature is room temperature (About 25°C), the reaction time is 6 days, samples are taken once a day, the specific resistance of the slud...

Embodiment 2

[0021] This process is used for engineering application of excess sludge. The treated sludge is the remaining sludge in the thickening tank of an oxidation ditch process in Zhengzhou to treat urban domestic sewage, with a water content of 98.5%. Sewage is treated for the treatment plant; the inoculated anaerobic granular sludge is taken from the IC reaction tank of a treatment plant. The specific steps are attached figure 1 shown.

[0022] 1) Acidification of muddy water: The remaining sludge in the thickening tank and the treated sewage are mixed into the hydrolytic acidification tank at a volume ratio of 1:1 for hydrolytic acidification until the pH is 3-4, and a submersible mixer is installed in the hydrolytic acidification tank;

[0023] 2) Adjust pH: after hydrolysis and acidification, enter the adjustment pool, use 10% NaHCO 3 Adjust the pH of the solution to 6.8-7.2;

[0024] 3) Fermentation of granular sludge: After adjusting the pH, enter the anaerobic fermentat...

Embodiment 3

[0027] This process is used for engineering application of excess sludge. The treated sludge is a certain A in Henan 2 / O process to treat the remaining sludge in the concentration tank of urban domestic sewage, the water content is 99%, and the water content of the sludge is measured to be 87.5% after direct plate and frame pressure filtration; the sewage to be distributed is the sewage treated by the treatment plant; The inoculated anaerobic granular sludge was taken from the IC reaction tank of a treatment plant. The specific steps are attached figure 1 shown.

[0028] 1) Acidification of muddy water: The remaining sludge in the thickening tank and the treated sewage are mixed into the hydrolytic acidification tank at a volume ratio of 1:1 for hydrolytic acidification until the pH is 3-4, and a submersible mixer is installed in the hydrolytic acidification tank;

[0029] 2) Adjust pH: After hydrolysis and acidification, enter the adjustment pool, use 10% Na 2 CO 3 Ad...

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Abstract

The invention discloses a process for improving the dewaterability of excess biochemical sludge. The process comprises the following steps: placing the excess biochemical sludge and sewage according to the volume ratio of 2:1 to 1:2 in a continuous stirring reactor, reacting for 5 to 7 days at a temperature of 20 DEG C to 30 DEG C and under the stirring speed of 60r/min to 80r/min and carrying out hydrolytic acidification until pH is between 3 and 4; regulating the pH of the sludge water subjected to the hydrolytic acidification by using at least one material of Na2CO3, NaOH or NaHCO3 so as to reach 6.8 to 7.2; inoculating the sludge water with pH regulated with anaerobic granular sludge, placing in an anaerobic fermentation tank and carrying out anaerobic fermentation treatment for 5 to 8 days by controlling the temperature within 33 DEG C to 37 DEG C so as to obtain the fermented sludge. Based on the method with the combination of the sludge, the sewage acidification and the anaerobic fermentation of the granular sludge, the dewaterability of the excess sludge is improved; the treatment efficiency is improved; the reaction period is shortened; the secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a process for improving the dewatering performance of biochemical excess sludge. Background technique [0002] Excess sludge is a by-product generated in the process of sewage treatment by activated sludge method. Its water content reaches 95%~99%. It is bulky, fluidized and difficult to handle. The moisture content of the mud cake formed by mechanical dehydration after concentration is still 70-80%, the transportation cost is high, and the landfill site is occupied. Excess sludge is composed of hydrophilic negatively charged colloidal particles with high volatile solid content, large specific resistance, and difficult dehydration. Generally, the pretreatment before mechanical dehydration is to add inorganic and organic polymer coagulants, and the cost is relatively high. Anaerobic sludge digestion is a commonly used sludge stabilization method at h...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12
Inventor 李海松王敏程婷党卫星代吉华买文宁王岩
Owner 知和环保科技有限公司
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