Method for innocent treatment of surplus sludge after biochemical treatment of organic chemical waste water

Abstract

The invention relates to a method for the innocent treatment of surplus sludge after the biochemical treatment of organic chemical waste water, which comprises the following steps: settling the surplus sludge, slaking, dehydrating and calcining. The method is characterized in that the settled sludge having a water content of 97-99% is slaked; in the slaking step, the sludge and carbide slag slurry are thoroughly stirred with compressed air in a slaking tank and are slaked with strong alkali, the volume of the sludge is 0.02-0.08% of the volume of the carbide slag slurry, the pH value of the carbide slag slurry is 12-14, and the solid content is 5-8%; after the slaking step is finished, filter press dehydration is performed to obtain a filter cake having a water content of 30-35%; and in the calcining step, the filter cake is used as one of components for producing cement clinker and is calcined in a kiln. The treatment method realizes the reutilization of sludge.

Description

1. Technical field [0001] The invention relates to a harmless treatment method for residual sludge after biochemical treatment of chemical wastewater to realize resource utilization of sludge. 2. Background technology [0002] In the prior art, the residual sludge produced after biochemical treatment of organic chemical wastewater is generally solid or fluid with a water content of 75-99%. The solid components mainly include organic debris, bacterial cells, inorganic particles, colloids, and agents used for flocculation. It is a relatively complex mixture with organic components as the main component and no heavy metal components. It contains potential utilization value The organic matter, nitrogen (N), phosphorus (P), potassium (K) and various trace elements, the current common treatment methods are: [0003] 1. Mechanical dehydration: Generally, it can be processed to a moisture content of 80%; [0004] 2. Chemical conditioning + plate-and-frame filter press: including d...

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Problems solved by technology

[0005] 3. Anaerobic fermentation: Anaerobic fermentation is carried out in an anaerobic fermentation tank at a temperature of about 40 degrees Celsius to produce biogas and other available resources, but the biogas residue after anaerobic still needs subsequent treatment. The common follow-up treatment is good Oxygen fermentation requires a large investment;

[0008] The above-mentioned treatment methods all have high treatment costs, and the sludge is difficult to be effectively used. It is disposed of in the natural environment, including the ground, underground and water, which will have adverse effects on the ecological environment.