Restoration of polluted soil using activity sludge and biomass waste material

A technology for biomass waste and polluted soil, which is applied in the combined field of polluted soil remediation and residual activated sludge treatment and disposal of sewage treatment, can solve the problems of high energy consumption in the heating process, and achieve the effect of low cost

Inactive Publication Date: 2007-10-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

Chinese patent (publication number: CN 1493535) discloses a method of using activated sludge to prepare activated sludge carbon. The method is to process activated sludge at 200-700°C for 0.5-2 hours to obtain activated sludge. P

Method used

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Effect test

Embodiment 1

[0013] Ingredients: mixing oil-contaminated soil, activated sludge and crushed corn stalks uniformly in a volume ratio of 1:1: (5-10), adding water until the water content is 50%-60% by weight.

[0014] Heap rot: pile up materials on the ground with isolation layer, static heap rot for 10 to 16 days, keep the temperature in the heap above 55℃ for more than 3 days or keep it above 50℃ for more than 7 days; The materials are fully mixed, statically composted for 10 to 20 days, and compost is obtained.

[0015] Compost application: Evenly spread compost at 800 kg to 1.5 tons per mu on the oil-contaminated soil, plow deeply, and plant sweet sorghum. The stalks of sweet sorghum can be squeezed and fermented to produce fuel ethanol, the seeds can also be used as raw materials for fuel ethanol fermentation, and the waste residue can be used for composting to treat polluted soil.

Embodiment 2

[0017] Ingredients: the heavy metal polluted soil in the mining area, activated sludge and bagasse are uniformly mixed according to the volume ratio of 1:2: (6-12), and water is added until the water content is 60% by weight.

[0018] Composting: stack the materials in the composting pool, static composting for 10 to 15 days, keep the temperature in the heap above 55°C for more than 3 days or above 50°C for more than 7 days; then turn the materials regularly to make the materials fully mixed Evenly, statically compost for 10 to 20 days to obtain compost.

[0019] Compost application: 600 kg to 1.2 tons of compost per mu is evenly scattered on the soil contaminated by heavy metals, deep plowed, and local herbaceous plants, shrubs or trees that grow well are introduced. Due to the natural selection of local plants for many years, they can adapt to the soil polluted by heavy metals. With the application of compost, the growth will be better, which is conducive to the removal and ...

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Abstract

A method for using the used active sludge and biomass to repair the polluted soil includes such steps as proportionally mixing the polluted soil with the used active sludge and biomass, and water, stacking for fermenting while periodically turning it over to obtain compost, applying it to the polluted soil, deep ploughing, and growing the plants with developed root system.

Description

technical field [0001] The invention belongs to the field of environmental technology, and relates to a combined method for treating and disposing of contaminated soil remediation and residual activated sludge from sewage treatment. technical background [0002] Soil is an important material basis for human production activities and an indispensable and difficult-to-regenerate natural resource. At present, the situation of soil pollution in our country is relatively severe, and the ecological safety of agricultural products caused by soil pollution cannot be ignored. Soil acts as a sink for environmental pollution, in which toxic and harmful chemicals can be transmitted through the atmosphere, water bodies, and food chains, endangering human health. In recent years, all countries in the world, especially developed countries, have invested huge manpower, material and financial resources to carry out in-depth research on the remediation of contaminated soil and have made some...

Claims

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Application Information

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IPC IPC(8): C05F15/00C05F7/00C05F11/00C05F17/00B09C1/10B09C1/00
CPCY02A40/20Y02W30/40
Inventor 白志辉李玉洁陈健呼庆庄绪亮庄国强齐鸿雁张洪勋
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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