According to the physical circumstances of sludge compost, a compost maturity degree modeling method based on wavelet neural network is presented. We select the index of compost maturity degree and take high temperature duration, moisture content, volatile solids, the value of fecal bacteria, germination index as the judgment parameters.
Nov 18, 2018 · The plant possessed 21 fermentation tanks, and the volume of each fermentation tank was 200 t. The compost pile size was 35 × 5 × 2.2 m. Intermittent aeration was performed for sewage-sludge composting in the plant. The aeration system was compatible with the computer controls for air volume.
Mar 1, 2014 · Static aerobic composting of municipal sewage sludge with forced ventilation or air ventilation using matured compost as bulking conditioner was investigated. Physical and chemical parameters, e.g., temperature, moisture content, VSS, CODcr, pH, and germination index (GI), were analyzed to characterize the composting process. Fermentation starts quickly in both forced and air ventilation
Nov 23, 2017 · Sludge composting with subsequent use in landscaping does not only show an unfavorable environmental balance, but it is the only relevant route leading to additional CED and Global Warming
Using no moving parts. The faeces and toilet paper are separated from flush water. The wet faeces and toilet paper are dropped into one of two chambers and is fully composted by earthworms over the following three to five years. The separated waste water goes on for further treatment in the reed beds.
May 10, 2022 · Biosolids/ sewage sludge composting technology is typically done at higher temperatures (55℃) which imitates an accelerated natural process that takes place on the open floor where the organic materials (leaf litter, animal wastes) are broken down. Resulting in an overall reduction of volume, or conversion to more stable organic materials.
Sep 20, 2022 · Composting is one of the ways to return sewage sludge nutrients to the soil and thus keep them in the economic cycle. This well-known technique is still being developed in search of more advanced, optimal solutions. This study presents the results of an environmental and economic analysis of the sludge treatment processes used in a municipal wastewater treatment plant. The sludge (up to 4700
Jan 1, 2022 · This composting method has low investment cost, high degree of automation, better control of temperature and aeration conditions, effective sanitation and less odors, relatively short composting time, small amount of fillers, and small area [26]. However, this process requires additional construction of fermentation tanks, which will increase a
Dec 28, 2021 · A field experiment was conducted to demonstrate the beneficial and negative aspects of (urban) sludge compost fertilization in apples and to assess the risk of soil contamination with heavy
Save area Model One Model two Model Three parameter information Tank diameter (mm) 5500 Tank height (mm) 8440 Tank volume height (mm) 3900 Minimum floor area (M2) 55 Tank volume (M3) 86 Bottom bolwer (kw.h) 11*2 Treatment capacity (m3 / day) (including 50-70% water content) 7~10 Output (m3 / day) (about 30% water content) 3~4.5 Power Supply
increased knowledge of the sludge di gestion process he can improve design and operation. The concentration and conditioning of sludge for final disposal have re ceived too little attention. Both ef ficiency and degree of treatment re quired to produce a satisfactory efflu ent must vary greatly, and extremely high degrees of removal are necessary
Jul 25, 2018 · This research studies the physicochemical variability of sewage sludge from treatment plants in the south of Galicia (Spain) and determines if it is possible to establish a protocol for the use of bulking agent depending on the composition of the sludge and the development of the composting process.
May 8, 2020 · The process temperature must be kept between 55 and 65°C and the moisture content at 35−65% for degradation to take place at a reasonable rate and for the pathogenic microorganisms to be destroyed. The process takes around six months.
This degradation caused by various micro-organisms (figure 2) is accompanied by a rise in temperature which can exceed 70°C: this will destroy pathogenic germs and reduce product humidity (evaporation). Composting should be applied preferably to fresh sludge (rich in OM and nitrogen) but can also be used on digested or stabilised aerobic sludge.
Faecal sludge has a high moisture and nitrogen content, while biodegradable solid waste is high in organic carbon and has good bulking properties (i.e., it allows air to flow and circulate). By combining the two, the benefits of each can be used to optimize the process and the product.
