Reading guidance：According to relevant data, sludge disposal and treatment need a great amount of money. The cost for sludge disposal is times than that of sewage disposal, experts tries to use solar energy to dispose

     According to relevant data, sludge disposal and treatment need a great amount of money. The cost for sludge disposal is times than that of sewage disposal, experts tries to use solar energy to dispose sludge. The process is in aerobic composting fermentation technology was improved, can achieve the sludge treatment and disposal of the products after reduction, harmless and stable. At the same time, the technology very suitable for Yangtze River to the north of the province, because the area of sunshine duration and decreased rainfall, the use of solar and natural drying can not only realize sludge drying and effective solution to the, but also achieve construction cost and operation cost reduction.
 1. through the sewage treatment plant sludge filter press dehydration sludge moisture content of 80% to temporary stacking place, good rain and seepage.
 2. One to two tons quick lime is needed for one ton sludge, prevent mosquitoes.
 3. After being piling up for 10 to 15 days, 200-kg mixture of flyash, plant ash; then transported to drying field.
 4. sludge with 45% moisture content shipped to fermentation storehouse, mixed bacteria powder, the windrow or trough piled up, will drum tail gas ingress geosyncline (temperature of 60 to 70 degrees), and blower in turn forced ventilation about 10 days, to kill pathogenic microorganisms, organic matter conversion to humus. At this time, the moisture content decreased to below 35%.
 5. Use crusher to crush sludge to 10 to 15 meshes; mix organic matters according to certain proportion;
 6. Use disk to make pellets;
 7. Use rotary drying machine; Cylinder inlet temperature up to 300 degrees, feed inlet temperature of 70 degrees or so, further extinctions of various viruses, bacteria and eggs, deactivating the heavy metal ions. In the condition of high temperature, heavy metal ion tuberculosis and become insoluble in water and plant roots to absorb the small metal particles.
 8. After cooling and screening, finished products are packed and conveyed to finished warehouse. Mix with bacteria or repeatedly when air is basked in, turn and polishing machine drying, sludge and fly ash, ash mixing, rolling ranging in size of granular, with good air permeability, the sludge moisture content dropped to 45% to 40%, reduce the fermentation warehouse building area; do not use straw, peanut shells, rice bran as the fermentation filling material, there is no need to build straw storage and mixing bin; the windrow powder, 60 to 70 degree cylinder exhaust ventilation can improve the windrow internal temperature, prompting the nitrification decomposition of organic matter, transformed into the humus, warm enough to kill the virus and bacteria can be achieved by adding straw filling effect, can be appropriate to reduce the blower running time. In this way, can reduces power consumption, the purchase of straw costs, labor costs and other costs. After entering the drum sludge moisture rate reduced to 20%, 70 tons of sludge per day reduced to 14 tons, adding fly ash, ash, nitrogenous fertilizer, phosphate fertilizer, potash fertilizer and organic matter accessories, per ton of finished product containing 50% of the amount of sludge. With the same scale of straw fermentation technology compared to the investment can be reduced from 400 to 450 million yuan, saving electricity, labor costs, raw material costs 30 to 35 yuan / ton. Heavy metal content far below agricultural fertilizer standard. At the same time, but also save the construction funds and operating cost, small towns sewage treatment plant sludge treatment and disposal of the feasible way.
   The process in the production of organic compound fertilizer with organic nutrient rich, long fertilizer, improve soil structure characteristics, the application can achieve a significant yield increase effect. But because of the lower content of nitrogen, phosphorus and potassium (N P K = 6), people pursuit of high yield and uncontrolled applying no fertilizer machine, serious pollution of the land and the environment, for organic fertilizer has not been fully recognized, so the provisional estimate of the market price 500 yuan / ton. With the deepen people's understanding of organic fertilizer, organic fertilizer will have a vast market and rich profit space.
   According to the status of financial analysis, using the project profit is low, but as a supporting project of urban sewage treatment plant, its social benefit and environmental benefit is huge. It embodies the social value is inestimable. Therefore, the local government to make full use of national environmental protection to support infrastructure construction funds, launched as soon as possible to the sludge disposal project construction, prevent the sludge and cause secondary pollution, achieve the resources of sludge utilization. By improving the sewage treatment fee collection standards and the financial sector subsidy measures, to ensure the normal operation of sludge disposal, the harm and protect environment.
  Solar natural dehydration cooperates with aerobic fermentation. Solar drying of aerobic composting fermentation fertilizer granulation drying can not only solve the problem of disposal of sludge harmless treatment, and provides the market with organic fertilizer, is a way for small town sewage treatment plant for sludge treatment and disposal is more effective. The economic and technical comparison, the natural process of solar dry granulation in aerobic composting drying fertilizer has the advantages of low investment, low operation cost and easy management. As the environmental protection project, the local government is the main body of investment operation. We must increase investment support, subsidies or improve the sewage treatment fee collection standards from the Treasury, to ensure the normal operation of sludge disposal project, realize resource the use of sludge.
 
 
 
 
 

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