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How can sludge treatment be safer and more environmentally friendly

2019-7-31 23:13:42 Views

sludge Drying treatment It is an important part of sludge disposal, which directly affects the effect and cost of sludge resource disposal. At present, there are two main methods of sludge reduction, namely mechanical dewatering and thermal drying. Among them, mechanical dehydration generally includes pressure, plate pressure, screw filter press, screw filter press and other traditional equipment, thermal drying is divided into medium high temperature direct drainage drying and low temperature dehumidification drying.

The medium and high temperature direct discharge drying equipment includes high-temperature rotary drum drying, disc drying, pulp drying and other traditional equipment. Their common feature is that the investment in fixed facilities is relatively low, but it needs to be equipped with heat source (such as natural gas, high-pressure steam, etc.), natural gas supply facilities, hot blast furnace, combustion engine, steam boiler, water treatment system, waste gas (odor) treatment equipment, etc Generally, the comprehensive operation cost is higher than that of low-temperature drying More than 40%.

     The common point of mechanical dehydration and medium temperature drying is that the equipment input is relatively low, and the biggest difference is that the dehydration capacity is low( 60-80%)。 At the same time, because the water filtered out by pressure is still sewage, sewage treatment facilities must be provided. Therefore, the comprehensive cost (dehydration equipment, site, supporting infrastructure, sewage treatment equipment, electricity, sewage treatment chemicals) is very high, and the idle rate in actual production is high.

     heat pump Low temperature dehumidification and drying equipment There are sealed low-temperature dehumidification and drying equipment and micro negative pressure low-temperature dehumidification and drying equipment. Therefore, the dehumidification process has the characteristics of low-temperature operation, low-cost operation and low-temperature operation Serious odor leakage Uneven wet and dry "Sandwich" needs to be back mixed and re dried High failure rate (serious corrosion and damage of refrigeration components), so the amount of shutdown maintenance is large.

     The micro negative pressure heat pump low temperature dehumidification dryer is integrated on the basis of the advantages of the sealed low-temperature dehumidifier Micro negative pressure, waste gas incineration heat energy recycling, three pass continuous thinning drying Three technologies (including two patented technologies), better Compared with other technologies, the dehumidification technology has obvious advantages of high performance price ratio, low temperature leakage and high performance price ratio.

2、 Performance introduction of micro negative pressure and low temperature zone dehumidification and drying equipment

one Equipment and operation process:

Sludge input (sealed screw conveyor) ? molding( Molding machine) Low temperature dehumidification and dehydration (micro negative pressure low temperature dehumidifier) → dry material output (closed conveyor) → dry mud temporary storage (automatic storage bin) → transportation (automobile)

two Flow chart:

  Picture 1.png

three Principle

The molding (columnar) sludge is put into the three return closed-loop dehumidification and dewatering system, and the sludge automatically turns twice, and then goes through shaping drying (removing surface free water), uniform drying (removing gravity water), accelerating drying (removing closed water), and finally reaches the set moisture content( 40% )During discharging, the moisture of sludge is discharged in the form of small molecules by dehumidification heat pump, and the water quality is clear and transparent, which can be recycled; during the dewatering process, the incremental gas with thermal expansion is input into the micro high-temperature incinerator for incineration through the micro negative pressure system, and the heat generated is then input into the drying system to provide energy for sludge drying, so as to realize full closed and full circulation, zero pollution and zero emission in the operation process.

  1. schematic diagram:

      Picture 2. Png

five Eight advantages of low temperature dehumidification and drying with micro negative pressure belt

    1)、 Water content in discharge 40% → 5% adjustable Electric dehydration 4.2kg Material weight reduction More than 70%

    2)、 200 kwh / T Wet mud) save 40% (drying at medium and high temperature)

    3)、 quantity of heat to the full utilize No odor, dust and sewage discharge

    4)、 No static electricity in low temperature operation   High corrosion resistance and long life More than 15 years

 Sludge dryer


Tel: 18080555651

 

key word: Sludge treatment, sludge drying, solid waste treatment, municipal sludge, sewage sludge

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