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The technology to use sludge to produce organic fertilizer process

 The domestic sludge produced by the sewage treatment plant has always been a headache for the environmental protection department. Because the sludge is rich in organic matter, they are prone to stench, breed flies and mosquitoes, and pollute the environment. At present, most of them will be taken to landfill or incinerated, but landfills will occupy a large area and will easily pollute surface water, groundwater, and incineration sludge. However, after the domestic sludge is fermented by microbial strains, it can be turned into organic fertilizer. It is applied to forest trees, flowers, turf grass and used as a seedling substrate for forest containers. Both have good growth effects, soil physics, chemistry and biology.The nature of the study has been improved, thus fully realizing the resource utilization of domestic sludge.

The domestic sewage is produced by the treatment of domestic sewage. The domestic sewage is produced by the residents' toilets, kitchens and bathrooms. Therefore, the domestic sewage is “nutritious”. The organic matter content of domestic sludge after fermentation is generally higher than 50%, the nutrient index such as NPK is between 5% and 7%, and the heavy metal content is very low, which is in line with the basic standards of organic fertilizer, and can be used as fertilizer.

The core of sludge production organic fertilizer technology is to use sludge bio-fermentation strains, add organic or inorganic materials such as oil slag and plant straw, and ferment the pathogenic microorganisms and mites eggs in the sludge after high-temperature fermentation for about 12 days. Fixed in microbes or turned into insoluble carbonates to prevent heavy metals from entering the food chain. The sludge dumper is used to efficiently remove water, add beneficial microbial flora, balance the activated nutrients, and the sludge is converted into bio-organic fertilizer.

Bio-organic fertilizer produced by applying sludge improves soil activity, effectively repairs soil compaction caused by long-term application of inorganic fertilizer, is conducive to the absorption of crops and balanced nutrition, and the active flora greatly promotes the effective release of nutrients of residual nitrogen, phosphorus and potassium in soil.

Technical characteristics of sludge organic fertilizer production:
1. Sludge moisture regulation: Add water-absorbing auxiliary materials to the sludge, such as crop straw, rice husk powder, wood chips, bacilli, branches, leaves and sludge fertilizer with low water content after fermentation. Sludge accounts for 70%, and water-absorbing excipients such as household waste account for about 30%.
2. Dilution and addition of strains: use mold-free corn flour live bran (proportion 1: 1:3-5) to dilute the strain (may add a small amount of water), or use other fine powder materials such as rice bran instead. The diluted mixture of bacteria is evenly spread into the pile. The biological compound fermentation bacteria are added to the sludge, and are generally added before the fermentation, and the fermentation bacteria are evenly mixed with the sludge by turning and stirring.

Sludge organic fertilizer contains nutrients necessary for plant growth, has a good effect of improving soil physical and chemical properties, is the main source of soil microbial energy and nutrients, is an important measure to reduce agricultural costs, is to maintain and promote soil nutrient balance, the important part of fertilizing soil, can significantly increase the soil organic matter content, can significantly reduce the nitrogen leaching in the soil, weaken the pollution of the groundwater by the inorganic fertilizer, and mediate the soil water, fertilizer, gas, heat, fertilizer and water retention capacity. Promoting effects, especially for poorly structured soils, are rare improvements.

The use of sludge and straw waste to process organic fertilizers has reduced environmental pollution problems. On the other hand, it has played a role in nutrient returning, fertilizing soil and improving crop quality, increasing the output of agricultural products, and effectively promoting the increase in income for the farmers, it plays an active role in promoting the development of ecological agriculture and organic agriculture.