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制浆造纸企业会产生大量初级污泥,由于其中含有大量的纤维和造纸填料,目前有少数企业将其回用。为了研究污泥回用的可行性,以欧洲制浆造纸企业的20种初级污泥为研究对象,分析了其纤维含量、纤维质量和其他参数,以此将污泥分为不同的等级。将污泥作为添加物用于纸或纸板的生产中,实验结果表明,根据污泥等级的不同,可分别将其用于不同纸和纸板的生产;实验所用的20种污泥中至少有12种可以回用于纸和纸板的生产中。 相似文献
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随着污水处理量的增加,污泥的排放量也在逐年递增.由于污泥含水率很高且保水性强,单靠简单的机械压缩过滤很难达到理想的脱水效果,给其处理和处置带来很多问题.本研究在制备有机高分子絮凝剂的基础上,与由钢渣、硫铁矿渣自制的无机高分子絮凝剂配伍使用,用于污泥脱水,一方面以废治废,另一方面降低成本,同时能提高污泥的脱水性能.研究表明自制的有机絮凝剂与无机絮凝剂复配进行污泥脱水,在5 kPa真空度下,其水分去除率为24.08%,比国外进口产品高出4.39%,且成本较低,具有一定的市场竞争力. 相似文献
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研究了将造纸过程中的2种废弃物——废水处理时产生的污泥及纸浆筛选净化时产生的废渣用作建筑材料(黏土砖)的原料的可行性.污泥和废渣的性质和组成符合黏土砖的性能要求,可用于生产黏土砖.污泥和废渣热值高,应用到黏土砖中可节约原料和能源.实验结果表明,随废弃物添加量的增加,黏土砖的线性膨胀和吸水性能提高,抗压缩性能降低;用造纸废渣制备的砖块试样比用污泥制备的砖块试样的抗压缩性能降低得更加明显;此外,加入2种废弃物的砖块试样的热传导性能均明显降低. 相似文献
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造纸厂的污泥可用于纤维板生产,因为一次污泥(PS)含有纤维,二次污泥(SS)具有自黏附能力。探讨了不同制浆方法产生的二次污泥与一次污泥质量比对纤维板性质的影响,结果表明,增加二次污泥含量可提高纤维板的内结合强度90%,膨胀厚度增加92%。利用CTMP污泥可获得最好的物理机械性能,TMP污泥次之,KP污泥最差。 相似文献
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改良型氧化沟污泥膨胀的发生及控制措施 总被引:1,自引:1,他引:0
结合改良型氧化沟处理文化用纸生产废水的工程实例,介绍了此次污泥膨胀的发生和控制过程。分析发现,进水浓度和化学品引起的泡沫是此次污泥膨胀的主要原因。 相似文献
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Enhanced treatment efficiency of an anaerobic sequencing batch reactor (ASBR) for cassava stillage with high solids content 总被引:1,自引:0,他引:1
Cassava stillage is a high strength organic wastewater with high suspended solids (SS) content. The efficiency of cassava stillage treatment using an anaerobic sequencing batch reactor (ASBR) was significantly enhanced by discharging settled sludge to maintain a lower sludge concentration (about 30 g/L) in the reactor. Three hydraulic retention times (HRTs), namely 10 d, 7.5 d, 5 d, were evaluated at this condition. The study demonstrated that at an HRT of 5 d and an organic loading rate (OLR) of 11.3 kg COD/(m3 d), the total chemical oxygen demand (TCOD) and soluble COD (SCOD) removal efficiency can still be maintained at above 80%. The settleability of digested cassava stillage was improved significantly, and thus only a small amount of settled sludge needed to be discharged to maintain the sludge concentration in the reactor. Furthermore, the performance of ASBR operated at low and high sludge concentration (about 79.5 g/L without sludge discharged) was evaluated at an HRT of 5 d. The TCOD removal efficiency and SS in the effluent were 61% and 21.9 g/L respectively at high sludge concentration, while the values were 85.1% and 2.4 g/L at low sludge concentration. Therefore, low sludge concentration is recommended for ASBR treating cassava stillage at an HRT 5 d due to lower TCOD and SS in the effluent, which could facilitate post-treatment. 相似文献
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Bindal SK Nikolov AD Wasan DT Lambert DP Koopman DC 《Environmental science & technology》2001,35(19):3941-3947
Radioactive waste treatment process usually involves concentration of radionuclides before waste can be immobilized by storing it in stable solid form. Foaming is observed at various stages of waste processing like SRAT (sludge receipt and adjustment tank) and melter operations. This kind of foaming greatly limits the process efficiency. The foam encountered can be characterized as a three-phase foam that incorporates finely divided solids (colloidal particles). The solid particles stabilize foaminess in two ways: by adsorption of biphilic particles at the surfaces of foam lamella and by layering of particles trapped inside the foam lamella. During bubble generation and rise, solid particles organize themselves into a layered structure due to confinement inside the foam lamella, and this structure provides a barrier against the coalescence of the bubbles, thereby causing foaming. Our novel capillary force balance apparatus was used to examine the particle-particle interactions, which affect particle layer formation in the foam lamella. Moreover, foaminess shows a maximum with increasing solid particle concentration. To explain the maximum in foaminess, a study was carried out on the simulated sludge, a non-radioactive simulant of the radioactive waste sludge at SRS, to identify the parameters that affect the foaming in a system characterized by the absence of surface-active agents. This three-phase foam does not show any foam stability unlike surfactant-stabilized foam. The parameters investigated were solid particle concentration, heating flux, and electrolyte concentration. The maximum in foaminess was found to be a net result of two countereffects that arise due to particle-particle interactions: structural stabilization and depletion destabilization. It was found that higher electrolyte concentration causes a reduction in foaminess and leads to a smaller bubble size. Higher heating fluxes lead to greater foaminess due to an increased rate of foam lamella generation in the sludge system. 相似文献
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高分子絮凝剂复配进行污泥脱水的研究 总被引:1,自引:0,他引:1
随着污水处理量的增加,污泥的排放量也在逐年递增.由于污泥含水率很高且保水性强,单靠简单的机械压缩过滤很难达到理想的脱水效果,给其处理和处置带来很多问题。本研究在制备有机高分子絮凝剂的基础上,与由钢渣、硫铁矿渣自制的无机高分子絮凝剂配伍使用,用于污泥脱水,一方面以废治废,另一方面降低成本,同时能提高污泥的脱水性能。研究表明自制的有机絮凝剂与无机絮凝剂复配进行污泥脱水,在5kPa真空度下,其水分去除率为24.08%,比国外进口产品高出4.39%,且成本较低,具有一定的市场竞争力。 相似文献
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采用移动床生物膜反应器处理生活污水,考察了接种污泥质量浓度对挂膜启动过程的影响,同时对启动过程中微生物相的变化、悬浮污泥的影响进行了初步分析。结果表明:在不添加接种污泥的条件下,反应器能够在两周内完成挂膜启动,载体上附着微生物生长稳定时挥发性悬浮污泥(VSS)质量浓度达1.2g/L;栽体上微生物的附着生长主要可分为3个阶段:适应期、增长期以及稳定期,不同阶段微生物相的种群分布不同,各有其特征微生物存在;反应器在挂膜启动过程中,接种所需的临界活性污泥质量浓度在0.1g/L以下。 相似文献
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