Deep-dewatering conditioning agent suitable for high-grade anaerobic digested sludge and application thereof

A technology of anaerobic digestion and deep dehydration, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve problems such as the influence of dehydration performance, and achieve the effect of improving dehydration effect, simple synthesis and application methods, and easy control of conditions

Inactive Publication Date: 2018-06-15
BEIJING DRAINAGE GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of EPS will also affect the dehydration performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take advanced anaerobic digested sludge with a solid content of 4.5% from a municipal sewage treatment plant, add 1.5% sodium dodecylsulfonate aqueous solution with a mass concentration of 10%, put it on a magnetic stirrer after adding, and After stirring at a speed of 300 rpm for 0.5 min, stir at a speed of 200 rpm for 5 min. Prepare a 20% mass concentration of polyferric sulfate solution, take polydimethyldiallyl ammonium chloride and polyferric sulfate solution at a mass ratio of 1:1, react at 50-70°C for 30 minutes, and mix well to obtain a composite The flocculant is added with 4% composite flocculant, and the conditioner is prepared after stirring rapidly at a speed of 300rpm for 0.5-1min. The CST value of the sludge can be reduced from 388.4s to 37.6s. It is squeezed with a pilot plate and frame machine with a filter plate of 80cm long. The mud feeding pressure is 0.8mpa, and the squeezing pressure is 1.6mpa. The mud feeding and squeezing are 1h each, and the moi...

Embodiment 2

[0027] Take advanced anaerobic digested sludge with a solid content of 4.2% from a municipal sewage treatment plant, add 2.5% sodium lauryl sulfate aqueous solution, the mass concentration is 10%, put it on a magnetic stirrer after adding, and set the temperature at 500rpm After stirring rapidly for 0.5 min at a rotating speed of 200 rpm, stir for 5 min at a rotating speed of 200 rpm. Prepare a 20% mass concentration of polyaluminum sulfate solution, take polyacrylamide emulsion and polyaluminum sulfate solution at a weight ratio of 5:1, react at 50-70°C for 30 minutes, mix well to obtain a composite flocculant, and then add 3.5 % composite flocculant, and then rapidly stirred at a speed of 300rpm for 0.5-1min to prepare a conditioner. The CST value of sludge can be reduced from 373.7s to 40.2s.

Embodiment 3

[0029] Take advanced anaerobic digested sludge with a solid content of 4.6% from a municipal sewage treatment plant, add 3% aqueous solution of sodium lauryl sulfate, the mass concentration is 10%, put it on a magnetic stirrer after adding, and After stirring at a speed of 300 rpm for 1 min, stir at a speed of 300 rpm for 5 min. Prepare a 20% mass concentration of polyferric sulfate solution, take the above two solutions at a weight ratio of 2:1, react at 50-70°C for 30 minutes, mix well to obtain a composite coagulant, and then add 3% composite flocculant , the conditioner was prepared after rapid stirring at 300 rpm for 0.5-1 min. The CST value of sludge can be reduced from 386.5 to 36.9s.

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PUM

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Abstract

The invention relates to a deep-dewatering conditioning agent suitable for high-grade anaerobic digested sludge and application thereof. The conditioning agent is prepared from a composite flocculantand a surface active agent, wherein in solid content of the sludge, the adding amount of the composite flocculant is 2% to 4.5%, and the adding amount of the surface active agent is 1.5% to 3%; the composite flocculant is inorganic / organic composite flocuulant, and the surface active agent is sodium dodecyl sulfate and / or lauryl sodium sulfate. A synergistic effect between the composite flocculantand the surface active agent is utilized to effectively improve sludge dewatering performance, and the situation that a water content of mud cake is reduced to 60% or less is effectively achieved after the sludge is dewatered.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a deep dehydration conditioner suitable for advanced anaerobic digestion sludge and its application. Background technique [0002] In recent years, urban sewage treatment has developed rapidly, and urban water environment management has achieved remarkable results. However, a large amount of sludge generated in the process of urban sewage treatment has not been generally effectively treated and disposed of. These sludges are likely to cause secondary pollution to groundwater, soil, etc., and become a threat to environmental safety and public health. After the sewage enters the sewage plant, most of the pollutants are concentrated on the sludge. How to properly dispose of the sludge has always been a hot spot for researchers. In recent years, the state has put forward some strategic control standards in terms of sludge treatment. The current situation in the actual trea...

Claims

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Application Information

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IPC IPC(8): C02F11/14
CPCC02F11/14
Inventor 张静慧文洋阜崴李伟付兴民马富亮常菁
Owner BEIJING DRAINAGE GRP CO LTD
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