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首页> 外文期刊>World Journal of Microbiology & Biotechnology >Changes in physical, chemical and microbial parameters during the composting of municipal sewage sludge
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Changes in physical, chemical and microbial parameters during the composting of municipal sewage sludge

机译：城市污水污泥堆肥过程中物理，化学和微生物参数的变化

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摘要

Changes in physical, chemical and microbial parameters were investigated during the composting of municipal sewage sludge. Raw sewage sludge (30% dry matter) was mixed with compost from sewage sludge (85% dry matter) in 3:1 ratio (v/v). The mixture was divided into 4 windrows which were composted under the same conditions except the turning factor. The turning was every 7, 10, 15 days and according to the temperature which must be (55-65A degrees C) for windrow 1 (W1), windrow 2 (W2), windrow 3 (W3) and windrow 4 (W4), respectively. Water was added to adjust the moisture content (40-60%). The composting process consisted of 2 periods; fermentation (12 weeks) and maturation (4 weeks). The results showed that the temperature reached the maximum after 12 weeks for W1 and 11 weeks for W2, W3 and W4 and then decreased. The final compost was nearly odourless and black, especially in case of W4. The general trend indicates a decrease in organic matter, organic carbon and nitrogen (N), whereas ash, potassium (K) and phosphorus (P) increased and consequently C/K and C/P ratios decreased. There was a slight increase in C/N ratio. The pH increased and then decreased to near neutrality at the end. The mesophilic bacteria increased during the fermentation period and decreased after that, whereas the thermophilic ones increased with increasing of temperature, decreased after 2 weeks and increased again during the fermentation period and then decreased. The mesophilic and thermophilic fungi were present during the first week and disappeared after that. The final compost was pathogens-free as indicated by the counts of coliforms and Salmonella.
机译：研究了城市污水污泥堆肥过程中物理，化学和微生物参数的变化。将原始污水污泥（30％干物质）与来自污水污泥（85％干物质）的堆肥以3：1的比例（v / v）混合。将该混合物分成4堆，除转向因子外，在相同条件下堆肥。每7、10、15天进行一次车削，并根据第1行（W1），第2行（W2），第3行（W3）和第4行（W4）的温度（55-65A摄氏度），分别。添加水以调节水分含量（40-60％）。堆肥过程分为两个阶段;发酵（12周）和成熟（4周）。结果表明，温度在W1达到12周后达到最高，而W2，W3和W4则在11周后达到最高，然后降低。最终的堆肥几乎无味且呈黑色，特别是在W4的情况下。总体趋势表明有机质，有机碳和氮（N）减少，而灰分，钾（K）和磷（P）增加，因此C / K和C / P比降低。 C / N比略有增加。 pH值先升高，然后下降到接近中性。中温细菌在发酵期间增加，然后减少，而嗜热细菌则随着温度的升高而增加，在2周后减少，在发酵期间又增加，然后减少。中温和嗜热真菌在第一个星期出现，此后消失。最终的堆肥是无病原体的，如大肠菌和沙门氏菌计数所表明的。

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