Jan 14, 2013 · The biosolids-are-sewage-sludge secret is one that commercial compost marketers, some city waste disposal utilities, the EPA and even some environmental interest groups work hard to keep. Large amounts of money in the form of expensive public relations campaigns have been spent to make you think that spreading sewage on commercial food crops
Jul 15, 2021 · The utilization of nutrients in sewage sludge partly alleviates the economic and environmental constraints, and the composting process has been proved a cost-efficient and simple approach for the recycling of sewage sludge. During the bio-oxidative process, the thermophilic phase is considered to be the most effective stage for the biodegradation of organic matter in sewage sludge composting
Jun 20, 2012 · However, sewage sludge disposal in the future should focus on resource recovery, reducing environmental impacts and saving economic costs. The reuse of biosolids in all scenarios can be environmentally beneficial and cost-effective. Anaerobic digestion followed by land application is the preferable options due to low economic and energy costs
Sludge Composting. According to statistics there are nearly 600 sewage treatment plants in China at present. And the sludge generated during the sewage treatment process is about 0.3-0.5% of the sewage treatment capacity. If we calculate based on this data, China’s municipal sewage treatment plants discharge is about 1.4 x 10t/a of dry sludge.
From the perspective of large-scale industrial applications, a continuous-flow hydrothermal liquefaction system with higher efficiency and economic feasibility should be developed, although continuous-flow HTL of sewage sludge was demonstrated by the Xu’s group at Western University at lab-scale (0.6 kg/h feeding capacity) [Citation 69
Feb 2, 2018 · The objective of this study was to examine the feasibility of sewage sludge composting using a simple aeration method. Two consecutive composting trials (run A and run B) using Japanese sludge and woodchips (1:1, v/v) were conducted in cubic boxes (0.45 × 0.45 × 0.45 m3) made by plywood at Okayama University. Air was forced up through small holes perforated on two open-ended parallel PVC
Jun 21, 2019 · Nutrient recovery from secondary resources, such as wastewater, has received increasing attention in recent years. Nutrient cycle sustainability and recycling approaches are important measures under development and considerations. This paper aims to present an overview of routes and technologies for nutrient recovery from sewage sludge and measures for improving their sustainability. First
Oct 1, 2010 · The cost of producing sewage sludge compost was about US$ 52 per ton, saving about US$ 198 per ton by replacing commercial fertilizers. Therefore, sewage sludge composting and recycling can be an environment-friendly solution to disposal problems and an economical strategy for improving the soil conditions in landfills.
increasing the quality and reuse of sewage sludge improver. The processing of sewage sludge for agricultural use is consistent with the Circular Economy strategy, the implementation of which results in: - reducing the consumption of raw materials (in this case of artificial fertilizers), - limitation of the amount of landfilled waste,
Feb 1, 2023 · Seven sludge incineration technologies were evaluated from energy, environment and economy. •. Effect of incinerator type and auxiliary fuel on individual incineration were compared. •. Co-incineration with electric drying and steam drying was compared. Abstract. Sludge incineration attracts increasing interests in China.
May 1, 2014 · In the last years, innovative system has been developed to favour sewage sludge thermal treatment (Rada et al., 2014; Bianchini et al., 2015), which is the pre-condition for a more efficient
Composting is controlled fermentation that converts organic matter aerobically and produces stable humic and pre-humic compounds (figure 1). Aeration will only be effective if the medium is air-permeable. Dewatered sludge often has a low porosity; a bulking agent has to be added, usually in the form of a carbonaceous support (20% of the mixture
Nov 1, 2014 · Among them, composting is the most ideal because sewage sludge contains large amounts of organic matter, nitrogen, and other mineral elements (Villasenor et al., 2011) and composting can convert
Mar 16, 2021 · Fluidized bed gasification is a promising process technology to manage the growing amount of sewage sludge (SS) requiring disposal. Two samples of SS, produced in different seasons of the year by a municipal wastewater treatment plant, were subjected to gasification at 850 °C in a bench-scale fluidized bed reactor using, as a gasification agent, a nitrogen/air mixture at different values of
Dec 22, 2020 · Conventional fertilization practices in agroecosystems concern the supply of bioavailable nutrients, such as mineral fertilizers. A consolidated alternative to restoring the long-term fertility of agricultural soils is their amendment with organic fertilizers. Soil amendment with biowaste compost or sewage sludge represents a sustainable strategy to avoid the landfilling of organic matter
