Fundamental aspects of sludge filtration and expression

The filtration and expression behaviour of sewage sludge is discussed. Due to the increase of costs for controlled dumping and transport and more severe environmental legislation the need for decreased sludge volumes is rising. Filtration and expression are the cheapest dewatering operations and it is therefore desirable to remove the maximal feasible amount of water by mechanical dewatering. High dry solids contents of 35–40 wt% can already be reached at pressures of 300–400 kPa and optimal flocculation conditions; however at pressures of 6–10 MPa dry solids contents of 60 wt% can be reached. Further the modelling of the dewatering is discussed; model and experiment show acceptable agreement.     

污水处理厂污泥处理处置技术政策解读

随着城镇污水处理厂建设和运营,其污水处理厂的污泥处理处置凸显出它存在的问题,已直接影响污水处理厂的正常运行,迫切解决污泥处理处置问题是当前各个污水处理厂普遍存在的难点和热点。     

排泥水处理系统污泥负荷优化的中试研究

针对水厂排泥水处理系统处理负荷较低的问题,利用中试装置研究了不同排泥水浓度负荷和流量负荷条件下系统的运行状况,在此基础上确定了排泥水的最佳浓度范围、流量范围以及对应的最佳投药量,以保证排泥水处理系统高效、安全、稳定的运行.     

污泥处理的发展趋势

阐述了我国污泥处理工艺的现状，分析了制约污泥处理工艺进展的因素，探讨了污泥工艺取得的进展，并对发展方向进行了展望。指出了利用剩余污泥制造复合肥料的现实意义。     

谈污水处理厂污泥处理系统

主要论述了污水处理厂的污泥处理系统,从污泥处理的各个环节,包括排泥、污泥浓缩、污泥调理、污泥机械脱水和污泥处置等几方面进行了阐述,行之有效的控制污泥生产,以保证污水处理厂水质合格达标。     

浅谈污泥处理技术

针对生活污水污泥处理这一世界性难题，结合我国国情，分析了国内主要污泥处理方式和技术，并介绍了排水管理处自行研制和设计的污泥处置方法，指出此法可广泛用于各种城市污水处理厂剩余污泥的处置。     

Second-stage activated sludge treatment of coke-plant effluents

Removal of residual cyanide and thiocyanate as well as nitrification of ammonia in biologically dephenolized coke-plant effluents has been studied in a laboratory and a pilot-plant scale. Technological parameters and operational conditions for an effective treatment of this wastewater to meet the BATEA effluents standards have been established.     

Anaerobic treatment kinetics of palm oil sludge

Treatment of palm oil sludge using the completely-mixed, suspended growth, continuous anaerobic fermentation system was studied in a laboratory scale. Biokinetic coefficients for system with and without solids recycle were evaluated. The treatment systems were effective in the removal of BOD, COD, and volatile suspended solids. The gas production rate averaged around 0.91 g⁻¹ BOD utilized with an energy yield of 20,000 J g⁻¹ BOD utilized for units with _c greater than 25 days. The _c^m, minimum solids retention time, was calculated to be more than 10 days. Measured _c^m was, however, lower than 7 days.     

Stability and maturity of thickened wastewater sludge treated in pilot-scale sludge treatment wetlands

Thickened wastewater activated sludge was treated in 13 pilot-scale sludge treatment wetlands of various configurations that operated continuously for three years in North Greece. Sludge was loaded for approximately 2.5 years, and the beds were left to rest for the remaining period. Three different sludge loading rates were used that represented three different population equivalents. Residual sludge stability and maturity were monitored for the last year. Sludge was regularly sampled and microbial respiration activity indices were measured via a static respiration assay. The phytotoxicity of sludge was quantified via a seed germination bioassay. Measurements of total solids, organic matter, total coliforms, pH and electrical conductivity were also made. According to microbial respiration activity measurements, the sludge end-product was classified as stable. The germination index of the final product exceeded 100% in most wetland units, while final pH values were approximately 6.5. The presence of plants positively affected the stability and maturity of the residual sludge end-product. Passive aeration did not significantly affect the quality of the residual sludge, while the addition of chromium at high concentrations hindered the sludge decomposition process. Conclusively, sludge treatment wetlands can be successfully used, not only to dewater, but also to stabilize and mature wastewater sludge after approximately a four-month resting phase.     

Power economy studies on activated sludge treatment

This study was focused on power economy of the activated sludge process which is the most energy consuming stage. The optimisation of oxygen requirements by using a Box complex algorithm method was investigated for different inflow rates, BOD loadings and related operating parameters. Linear regression analysis was used to obtain relationships between oxygen requirement, BOD loading and BOD removal under various operating conditions. The effect of such operating parameters as the MLSS concentration, hydraulic retention time and BOD loading on the power economy was investigated. Organic load and oxygen requirement relations for typical municipal wastewaters are presented in an attempt to obtain power economy in the aeration tank.     

山西省污水厂污泥处理技术路线分析

对山西省污水处理厂的污泥处理存在的疑难问题及关键性技术进行了分析,着重对污泥燃料化技术降低污泥含水率、提高热值,实现污泥资源化利用的技术内容进行了描述,提出了以污泥燃料化作为污泥综合利用技术路线的结论。     

时尚水生活

现代人对于淋浴的要求已不再局限于单纯的洁净,健康和舒适的沐浴为越来越多人所向往.     

Operating aerobic wastewater treatment at very short sludge ages enables treatment and energy recovery through anaerobic sludge digestion

Conventional abattoir wastewater treatment processes for carbon and nutrient removal are typically designed and operated with a long sludge retention time (SRT) of 10–20 days, with a relatively high energy demand and physical footprint. The process also generates a considerable amount of waste activated sludge that is not easily degradable due to the long SRT. In this study, an innovative high-rate sequencing batch reactor (SBR) based wastewater treatment process with short SRT and hydraulic retention time (HRT) is developed and characterised. The high-rate SBR process was shown to be most effective with SRT of 2–3 days and HRT of 0.5–1 day, achieving >80% reduction in chemical oxygen demand (COD) and phosphorus and approximately 55% nitrogen removal. A majority of carbon removal (70–80%) was achieved by biomass assimilation and/or accumulation, rather than oxidation. Anaerobic degradability of the sludge generated in the high-rate SBR process was strongly linked to SRT, with measured degradability extent being 85% (2 days SRT), 73% (3 days), and 63% (4 days), but it was not influenced by digestion temperature. However, the rate of degradation for 3 and 4 days SRT sludge was increased by 45% at thermophilic conditions compared to mesophilic conditions. Overall, the treatment process provides a very compact and energy efficient treatment option for highly degradable wastewaters such as meat and food processing, with a substantial space reduction by using smaller reactors and a considerable net energy output through the reduced aerobic oxidation and concurrent increased methane production potential through the efficient sludge digestion.     

Development of granular sludge for textile wastewater treatment

Microbial granular sludge that is capable to treat textile wastewater in a single reactor under intermittent anaerobic and aerobic conditions was developed in this study. The granules were cultivated using mixed sewage and textile mill sludge in combination with anaerobic granules collected from an anaerobic sludge blanket reactor as seed. The granules were developed in a single sequential batch reactor (SBR) system under alternating anaerobic and aerobic condition fed with synthetic textile wastewater. The characteristics of the microbial granular sludge were monitored throughout the study period. During this period, the average size of the granules increased from 0.02 ± 0.01 mm to 2.3 ± 1.0 mm and the average settling velocity increased from 9.9 ± 0.7 m h⁻¹ to 80 ± 8 m h⁻¹. This resulted in an increased biomass concentration (from 2.9 ± 0.8 g L⁻¹ to 7.3 ± 0.9 g L⁻¹) and mean cell residence time (from 1.4 days to 8.3 days). The strength of the granules, expressed as the integrity coefficient also improved. The sequential batch reactor system demonstrated good removal of COD and ammonia of 94% and 95%, respectively, at the end of the study. However, only 62% of color removal was observed. The findings of this study show that granular sludge could be developed in a single reactor with an intermittent anaerobic-aerobic reaction phase and is capable in treating the textile wastewater.     

时尚水生活

现代人对于淋浴的要求已不再局限于单纯的洁净,健康和舒适的沐浴为越来越多人所向往。淋浴房为浴室带来了时刻舒爽健康的卫浴空间,成为当众多家庭高端装修的选择,     

时尚水生活

现代人对于淋浴的要求已不再局限于单纯的洁净,健康和舒适的沐浴为越来越多人所向往.淋浴房为浴室带来了时刻舒爽健康的卫浴空间,成为当今众多家庭高端装修的选择.     

城镇污水处理厂污泥处理的可行性及发展方向

本文对城镇污水处理厂污泥处理处置的几种工艺路线进行论述和研究。结果表明：（1）在污泥处理与处置新技术的一些技术难题被解决之前,填埋工艺仍然为一种可行的工艺路线：（2）填埋工艺虽然仍然在使用,但新标准的出台使其能耗和处理成本不断增加：（3）新标准的出台让我们不得不探索一种新的污泥处理和处置方式：（4）污泥的综合利用相比其他新的处理处置工艺具有一定的优势,具有较好的发展前自＊n     

污泥处理技术的现状及发展探讨

在大量调查研究的基础上，概述污泥处理技术的现状，介绍了污泥处理技术的发展及相关的检测控制仪表、仪器的重要性，经分析各类设备、机械的优劣，提出了规模经营、综合利用的新思路。