Valorization of Agricultural Waste from Piggeries in Residential Areas to Promote Sustainable Production | Chapter 7 | Geography, Earth Science and Environment: Research Highlights Vol. 1

Piggeries are a quick way of generating an income in agriculture. Pigs multiply fast and can be used to generate an income within a short space of time, bringing in better livelihoods for the farmers and their families. Apart from the bright side of hog raising, there are some policy challenges in economic, environmental, health and social dimensions for sustainable agriculture. There are places where piggeries are located within residential areas hence need to consider their implication on the wellbeing of the people and their environment. An evaluation of opinions of various inhabitants of Seke Communal lands, in Mashonaland East province of Zimbabwe indicated that 70% of the population do not support piggery projects to be sited within the vicinity of homesteads. This population understood and resented the social and environmental implications of piggery waste and wastewater within their community. When proximate analysis was carried out on pig waste. It was noted to possess high levels of phosphates and nitrates amongst other nutrients. These were noted to be beneficial in crops when handled sustainably in promoting green production. On the other side, when handled otherwise, the same elements may pollute the environment with serious consequences. It was noted that splitting the waste into solid and liquid reduced the foul smell peculiar to piggeries. Using the waste management hierarchy priorities, piggery waste nutrients and wastewater recycling were recommended as better options for production system sustainability and environmental protection. It was noted that the solid waste could be composted or processed into organic fertilizers. Irrigation suitability tests were used to recommend the liquid for prior treatment before field applications through irrigation in promoting the circular economy. The same liquid could be edified and used in liquid fertilizer manufacturing. This study demonstrated the need for proper piggery waste management especially when the piggeries are located amongst various homesteads and also adequate regulatory enforcement. It was also noted that there is a need to keep updating statutory instruments in line with current scientific findings pertaining to the implications of piggery waste and wastewater on current environmental demands.

 

Author (s) Details

Samuel Kodani
Fertilizers, Farm Feeds and Remedies Institute, Harare, Zimbabwe.

 

Please see the book here:- https://doi.org/10.9734/bpi/geserh/v1/2829

Study on the Diversity of Heterotrophic Nitrogen Removal Bacteria in Piggery Wastes in the Mekong Delta, Vietnam | Chapter 7 | Innovations in Microbiology and Biotechnology Vol. 2

 The next phase was heterotrophic nitrogen removal in Pangasius fish (TRA) ponds in the Mekong Delta, now that we had the beneficial bacteria for wastewater treatment. A total of 2318 heterotrophic nitrogen removal (HNR) bacteria were isolated from piggery wastes (after biogas container) and divided into four categories: heterotrophic ammonia-oxidizing bacteria (569 isolates), nitrite-oxidizing bacteria (580 isolates), nitrate-oxidizing bacteria (600 isolates), and heterotrophic nitrifying and denitrifying bacteria (600 isolates) (569 isolates). The 16S rRNA gene was PCR amplified and sequenced almost completely. The HNR bacterium sequences were found to have a high degree of similarity to the GenBank reference strains (between 97 percent and 99.8 percent ). The consistency of phylogenetic trees based on 16S rDNA sequences was high, with nodes supported by high bootstrap (500) values. These suspected HNR isolates were split into four groups: Arthrobacter, Corynebacterium, Rhodococcus (high G+C content gram-positive bacteria), Staphylococcus, Bacillus (low G+C content gram-positive bacteria), and Klebsiella (low G+C content gram-positive bacteria) (gram-negative bacteria). In comparison to the other two groups, heterotrophic ammonium-oxidizing bacteria had the highest Pi values and heterotrophic nitrifying-denitrifying bacteria had the lowest Pi values. Theta values (per sequence) from S of SNP for DNA polymorphism showed that heterotrophic nitrate-oxidizing bacteria had the highest theta values. Many isolates had nitrogen utilisation ability at high concentrations (800–1200 mM), and high G+C gram-positive bacteria strains occupied greater than low G+C gram-positive bacteria strains, according to the current investigation on HNR bacteria from piggery wastes.

Author(S) Details

Cao Ngoc Diep
Biotechnology R&D Institute, Can Tho University, Vietnam.

Pham Viet Cuong
Vietnam Academy Institute of Science and Technology, Ha Noi City, Vietnam.

Bui The Vinh
CanTho Dairy Factory, Vietnam.

View Book:- https://stm.bookpi.org/IMB-V2/article/view/4719