landfill? composting? burn? why don't you make clay! sludge disposal industry news hengyuan recycling technology co., ltd-尊龙登录

the "sludge solid waste" ceramsite production project, which disposes 200t sludge every day, is put into operation in weifang, shandong province. the project adopts the unique collaborative disposal technology with large amount of sludge of shandong hengyuan waste technology co., ltd., which realizes the complete harmless and resource-based sludge. the core process of "low temperature drying high temperature roasting" can avoid the generation of dioxin, and the final product is ceramsite lightweight aggregate. ceramsite can be used in prefabricated building components, lightweight aggregate concrete, sponge city construction, sewage filter material, ecological wetland construction, etc. it has high added value and wide application prospect.
["sludge solid waste" ceramsite technology analysis]
"sludge solid waste" series recycling technology is jointly developed by hengyuan waste company and process engineering research institute of chinese academy of sciences. under the premise of ensuring product quality, the proportion of sludge (dry basis) can reach up to 50%. there are many ways to reduce energy consumption in the production process. ceramsite is a high-quality material with a wide range of uses, which realizes the complete harmless and resource-based disposal of sludge.
hengyuanli waste co., ltd. proposes the method of "low temperature drying high temperature roasting" to produce ceramsite. the whole production line adopts a unique set of ceramsite forming patent technology (invention patent no.: 201310564630.7). after the sludge and the solid wastes of si al system are mixed and granulated, they are dried at 200 ℃ and then directly put into the kiln for roasting at 1100 ℃. this method can greatly improve the yield of ceramsite, and the temperature of drying and baking section avoids the producing area of dioxin. during the roasting process, the organic matter of sludge is all combustion supporting, the solid wastes of si al system are melted and recombined at high temperature, the heavy metal elements are solidified into the lattice, and finally the resource product ceramsite is formed.
the core baking equipment of three leaf rotary kiln originated from england, the unique three leaf arc section heat exchange efficiency is high, which is twice as high as the traditional rotary kiln, realizing the purpose of low consumption and high yield. the length of the kiln is only 1 / 4 of that of the traditional rotary kiln, and the pelletizing process outside the kiln is adopted. the whole production line occupies a small area and has a high utilization rate of space, which greatly reduces the investment in civil engineering. the supporting waste heat recycling system can recycle the heat of kiln tail gas, and then use it in dehydration and drying, which meets the development requirements of green energy saving.
the production workshop is completely closed, and the negative pressure is used to treat the flue gas and odor, so as to achieve no secondary pollution. the whole production line integrates sludge drying, aging, molding, sintering and cooling, and is equipped with a cleaning treatment system. the whole process of ceramsite production is automated, and the whole workshop is almost unmanned. in the high-temperature roasting section of the core link, through the flame automatic control system matched with high-definition camera monitoring in the kiln, precise temperature adjustment can be realized to ensure the high quality of ceramsite products.
the technology has six characteristics, such as large amount of sludge, high yield and low energy consumption, electric control automation, waste heat reuse, flue gas odor treatment, small investment and so on. it represents the highest level of ceramic production industry in china at present.
[market application of ceramsite]
the ceramsite produced by this project can be used in building lightweight aggregate, sponge city construction, sewage filter material treatment, wetland floating bed construction, etc., with high added value and broad application prospect. the price of ceramsite varies from 150-800 yuan / m3 according to its own performance and use.
1. in commercial concrete, sand aggregate is replaced and ceramsite concrete is prepared to effectively reduce the weight of the building, which has good heat preservation performance, permeability resistance and fire resistance. fabricated building structure, high-rise building insulation block, long-span concrete component, foundation backfill and pouring can be widely used.
2. the porous ceramsite is an ideal sponge material for the construction of sponge city. it can be used in building green roof soilless cultivation, permeable pavement laying, etc. ceramsite can absorb and lock up a lot of rainwater and eliminate urban waterlogging. when the heat is hot, the water is evaporated and released to reduce the urban heat island effect.
3. sewage treatment is used as filter material. ceramsite filter material is light in quality, high in porosity, large in surface area, with sufficient mechanical strength, strong in adsorption, stable in chemical performance, and cheaper than activated carbon. it is suitable for decolorization and other treatment, and also can be used as industrial filter material.
4. for the cultivation of wetland floating bed green plants, the ultra light through-hole ceramsite can be used for the cultivation of microorganisms and green plants because of its uniform pore distribution, strong permeability and water absorption. it can be used in floating bed ecosystem, wetland ecosystem and so on, which is beneficial to plant root growth, can purify various water systems, and is an ideal way to deal with eutrophication water.
status of sludge disposal
the circular on strengthening the check and accounting of sludge treatment, disposal and emission reduction of urban sewage treatment facilities (no. 391) jointly issued by the ministry of environmental protection and the ministry of housing and urban rural development points out that all localities should, in accordance with the relevant laws, regulations and technical policies of the state, follow the technical route of "green, recycling and low carbon", and select reasonable and feasible technical methods to properly treat and dispose sludge according to local conditions.
limited by the conditions of sewage pipe network facilities in china, most of the domestic pipe network is still in the state of rainwater and sewage confluence. the content of organic matter in sludge is not high and the chemical composition is complex. at present, the mainstream technologies of sludge disposal in china are still dehydration and landfill, anaerobic fermentation, aerobic composting, etc., but the final direction of resource utilization is still mainly around land use, the heavy metals and bacteria contained in sludge can not be completely treated, and the real harmless goal can not be achieved. a few disposal enterprises that adopt dry incineration also rely on cement kilns and waste incineration kilns, with small amount of additives, unable to deal with the burned residues and fly ash, and greatly restricted by the region.
different regions have different subsidy policies for sludge treatment and disposal