Reading guidance：Using sludge to agriculture holds low investment, low energy consumption and low running cost. Organic matters in sludge can be transferred into improvement agent of soil. Therefore, using sludge in la

    Using sludge to agriculture holds low investment, low energy consumption and low running cost. Organic matters in sludge can be transferred into improvement agent of soil. Therefore, using sludge in land utilization is regarded as one of most potential disposal methods which can reduce the negative effect caused by sludge. Sludge can also be applied to mine field, construction waste pit, forest cutting field, refuse landfill and other relevant fields. These sludge utilization can reduce the potential threat of the sludge on human life, disposal of the sludge, and and the restoration of the ecological environment. The small town sewage treatment plant sludge contains an abundance of organic matter and N, P, K nutrients and plant required a variety of trace elements. And city sewage treated plants compared. The content of heavy metal is relatively low, after proper treatment can be used for improvement of abandoned mine sites, such as soil, increasing farmland, forest and horticultural plant nutrition. It will be small town sewage treatment plant sludge disposal of an important direction.
    Sludge farmland directly. In China has been running the sewage treatment plant, sludge has not by any treatment directly agricultural to accounted for more than 60%. The maturity of the sludge Shi for soil, microorganisms will use soil clearance of oxygen to continue activities for degradation of organic compounds, resulting in anaerobic environment in which the plant root hypoxia, and produce H2S, no gas, not composted sludge in microbial degradation was sustained activity will produce as by-products of various organic acids, the plants produce toxicity, inhibit plant seed germination, root growth and reduce crop yield.
Sludge indirect agricultural. The sludge microbial oxidation decomposition of organic matter, eventually transformed into the higher stability of humic like. Sludge compost can not only eliminate the odor of the sludge and high-temperature composting process can kill sludge in most pathogens and parasites, to achieve the purpose of harmless. Also after composting, after the decomposition of organic matter in the sludge formation of available nutrients for plant uptake and humus from compost to soil improvement, as the excellent farmland fertilizer. Urban sludge by composting operation for agriculture, has a good prospect, can significantly improve the yield and quality of crops.
    Sludge with simple operation, less equipment investment composting is only to existing the sludge from a waste into products process. After composting sludge loose texture, reducing capacity, sewage sludge fertilizer improve, suitable crops to absorb and to sludge final disposal. Urban sewage sludge compost land, heavy metals, organic pollutants, pathogenic bacteria, viruses, eggs and other content should control in the safe range, specific scope can be reference manure harmless sanitary standard (GB was 795.9 - 87), the sludge agricultural standard (GB 4284 - 84) and urban waste control standards for agricultural use (gb8172 - 87) and so on.
    Land utilization of sewage sludge of costs and benefits vary by use of sludge. Using sludge to replace organic fertilizer and conventional matrix and soil repair materials, the corresponding expenditure savings. Therefore, urban sewage sludge compost generally suitable for on the heavy metal content meet the requirements, and have market application areas. For those urban sewage mixed with a large number of industrial waste water, sludge containing heavy metals and other complex components, not agricultural use. At the same time, sludge production of organic fertilizer by sales of the radius and seasonal effects, there a market risk.
 
 
 

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