ecological treatment
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2021 ◽  
Vol 14 (22) ◽  
Author(s):  
Hanxi Wang ◽  
Jianling Xu ◽  
Lianxi Sheng

2021 ◽  
Author(s):  
Arnold Landy Fotseu Kouam ◽  
Ajeagah Aghaindum Gideon ◽  
Isaac Dennis Amoah ◽  
Tsomene Namekong Pierre ◽  
Okoa Amougou Thérèse Nadège

Abstract This study is aimed at highlighting the risks associated with the reuse of faecal sludge and proposed a sustainable treatment method. The sampling consisted of collecting samples of faecal sludge in 5L of sterilized containers and then transporting to the laboratory in a refrigerated chamber for the determination of helminth eggs using standard protocols. The experimental device consisted of two replicates, one test and one control. The test samples received active charcoal at different concentrations (C1, C2, C3, C4, C5, C6). The physico-chemical parameters were measured before and after treatment. The samples were then observed under the optical microscope at the 40X objective for morphological identifications. Molecular analysis was carried out using the Polymerase Chain Reaction technique. The viability of the eggs were determined using incubation and staining techniques. Analyses showed that the sludge used for irrigation contained eggs and larvae of 6 helminth species (S. stercoralis, A. duodenale, N. americanus, T. trichiuria, H. nana and Ascaris spp.) with viability percentages ranging from 57.72% to 74.46%. Treatment with active charcoal allowed significant adsorption of these parasites with yields ranging from 95 to 100%. In addition, the carbon used has favoured the alkaline stabilisation of the medium, which increases its absorption potential. It can therefore be used in the treatment of sludge because, unlike other chemical disinfectants, it does not present any toxic effects.


2021 ◽  
Vol 13 (3) ◽  
pp. 1559
Author(s):  
Tao Zheng ◽  
Xiaohu Lin ◽  
Jingcheng Xu ◽  
Jie Ren ◽  
Danyan Sun ◽  
...  

Constructed wetlands (CWs), an ecological treatment technology, is suitable for advanced treatment, but has an unsatisfying denitrification performance for steel rolling wastewater with low C/N ratio. This study combined sulfur autotrophic denitrification (SAD) with conventional constructed horizontal subsurface flow wetlands to treat steel rolling wastewater, exploring the feasibility of applying SAD to enhance the denitrification performance of CWs. The reactor consists of two sections, one filled with manganese sand and gravel (HFC) and another filled with ceramic, sulfur, and lime (HFSAD). Results showed that HFC had a good performance on removing turbidity, DO, COD, and TP, while the average removal efficiency of total nitrogen (TN) in HFC was just 25.6%. On this basis, HFSAD could remove 45.6% of TN subsequently, whose denitrification rate was 4–6 times as high as that of HFC. Increasing hydraulic retention time could improve removal efficiency of contaminants in HFC and HFSAD in different degrees. The analysis of microbial community structure, observation results of fillers and monitored sulfate all provided proofs for the occurrence of SAD. CWs combined with SAD can be applied in the treatment of steel rolling wastewater with low carbon, which can provide reference for ecological wastewater treatment, water saving, and recycling in iron and steel enterprises.


2021 ◽  
Vol 299 ◽  
pp. 02006
Author(s):  
Siyi Wang ◽  
Zixiang Ji ◽  
Yumin Wang

Decentralized wastewater treatment technology, especially natural ecological treatment technology has widely been used in rural regions. In this paper, a comprehensive life cycle assessment (LCA) of a typical wastewater ecological treatment technology - artificial wetland technology was conducted. SimaPro software was applied to simulate the wastewater treatment facility, and the CML2 baseline2000 impact evaluation method was selected to analyze the environmental loads and benefits during the life cycle. The environmental impact of the facility adopting grey-black separation mode is compared with that of the unified collection and treatment model to provide scientific basis and suggestions for the selection of wastewater collection and treatment model. The results indicated that the main environmental impact of the Southeast University artificial wetland system comes from the construction and operation of the artificial wetland and aeration tank. Marine water ecotoxicity is the main impact factor, followed by freshwater water ecotoxicity.


2021 ◽  
Vol 237 ◽  
pp. 37-44
Author(s):  
Asmaa Fathi ◽  
Nadia Boutaleb ◽  
Bouchaib Bahlaouan ◽  
Mohamed Bennani ◽  
Said Lazar ◽  
...  

2020 ◽  
Vol 65 (1) ◽  
pp. 267-277
Author(s):  
Valentin Ordodi ◽  
◽  
Ana-Maria Pană ◽  
Alina Dumitrel ◽  
Daniel Hădărugă ◽  
...  

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