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H2O2 could be used to improve the effectiveness of activated sludge process. Adding H2O2 into the modified aerated biofilter was to improve treatment efficiency of refractory organic compound (humic acid) and was to reduce amount of sludge waste. The activated sludge used for preparing the ABF was developed well and stably in the range of H2O2 c...

7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 727 | Lượt tải: 0

The association between climate variations and epidemics has been mentioned in literature, in which climate is one of the main factors affecting the distribution and outbreak of epidemics. Therefore, it is important and essential to treat past temporal patterns of climate fluctuations and HFMD as empirical analogues of future changes. To the bes...

8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 994 | Lượt tải: 0

There are some conclusions that can be drawn from this experiment: 1. The larger scale of the same conditions of earlier fermentation and dark-fermentation batch tests, despite produced a higher C/N ratio of 10.34 ± 0.17 and 10.14 ± 0.12; however once again confirmed that even at optimum condition, the C/N ratio of fermented biosolids would stil...

8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 868 | Lượt tải: 0

At the beginning of the crop (5 days after sowing), the CH4 emission increased gradually and there were no significant differences among treatments (p<0.05). In this stage, all plots were stagnant to keep soil anaerobic and limit grass germination. In the tillering stage (30-40 days after sowing), CH4 emission was the highest in the 3 treatments...

7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 985 | Lượt tải: 0

The results of the second year are similar to those of the first year. The Cd concentrations decreased in surface soils in all plots with S. nigrum growth. The Cd concentrations in the soils of the seven remediation plots decreased from an average of 2.33 mg kg-1 to an average of 1.53 mg kg-1, and the reduction ranged from 10 % to 14 %. The sta...

6 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 920 | Lượt tải: 0

Domestic solid wastes were classified by screening through suitable diameters sieves into 10 samples of 04 groups with different sizes: 2 samples with sizes under and over 120 mm (M1- 1, M1-2); 2 samples with sizes under and over 80 mm (M2-1, M2-2); 2 samples with sizes under and over 40 mm (M3-1, M3-2); 4 samples with sizes under 40 mm, 40 to 8...

8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 963 | Lượt tải: 0

The testing of applying anaerobic digestion process as an additional step to a wastewater treatment system at aquatic product processing factories showed the following results: - The biogas yield after 30 days of treatments with sludge from fish processing factory was from 305.3 to 444.2 L/kg ODMfermented in treatment of C 95-98 and of C 85-90. ...

7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1004 | Lượt tải: 0

In this study, 3 scenarios are developed and assessed based on the obtained benefit, which is supposed to be a major dynamic factor for the system, as summarized in Table 2. It is found that, despite of the hazardous waste, the obtained benefits from electronic appliances are almost similar in case of large home appliances excluding the desktop ...

7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1078 | Lượt tải: 0

In Vietnam, there are about 17,000 pig farms with over 500 pigs and less than 0.3 percent of them have a biogas facility. Biogas production from this size is about 50,000 m3/year. Therefore, developing the biogas purification technology plays an important role in biogas market in Vietnam. In this study, iron-based adsorbent (FeOOH) were tested a...

7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 936 | Lượt tải: 0

The analysis and comparison between two scenarios of sewerage sludge management in the case of Long Bien district, Hanoi city have shown the benefits in energy aspect of mesophylic anaerobic digestion by producing a large amount of biogas. The digested sludge in the process has been post-treated for soil application or/and energy generation. The...

6 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 956 | Lượt tải: 0