As a kind of new material, nanomagnetic Fe3O4 (NMF) has many advantages in water and wastewater treatment. In this paper, the adsorption characteristic for arsenic(III) (As) by NMF was studied, and the adsorption was compared with the traditional adsorbent of activated carbon (AC) and modified activated carbon (MAC). The results showed that the NMF had high adsorption performance for As, and the adsorption performance of modified activated carbon and activated carbon were far lower than that of magnetic nanomagnetic Fe3O4. The adsorption capacity for As with NMF, MAC, and AC was 0.189 mg.g-1, 0.023 mg.g-1 and 0.013 mg.g-1 in 0.25 mg.L-1 As solution, respectively. The adsorption rate for As was different from the three adsorbents. For NMF, it needs only 10 minutes to reach an adsorption balance, while the time to balance was 20 minutes for MAC and more than 120 minutes for AC. The adsorption for As by the three adsorbents all conform to Langmuir adsorption isotherm, and the adsorption kinetics for As by the three adsorbents were in accordance with the pseudo-second-order kinetics model. The adsorption efficiency of MAC and AC was lower than nanomagnetic Fe3O4. The nanomagnetic Fe3O4 was an effective adsorbent for arsenic.

Due to the widespread adoption of conventional approaches for the remediation of contaminated soils, these techniques have become more well-known in the literature. However, these methods have both advantages and disadvantages. Integrating traditional degradation technologies with Nano-technology might be the right solution for removing toxicants from the environment to overcome these problems. Nano bioremediation is a new technique that has gained prominence in recent years among many researchers worldwide. These techniques aim to remove the contaminants’ concentration and minimize their impacts on the environment. The integrated approaches benefit bioremediation and nanotechnology to remove the pollutants more efficiently within less time in an eco-friendly manner than individual processes. The current review provides insights into nanotechnology and different kinds of nanomaterials that have been reported in eliminating pollutants from the environment. Further, the mechanism and challenges with nano bioremediation were explained in detail.

Due to a lack of water treatment technology, developing and emerging nations have become significant polluters and water shortage is exacerbated by pollution. Ammonium toxicity is a huge global environmental concern with no clear solution. Population growth and industrialization destroy the ecosystem. Common and industrial products contain ammonium ions. Water pollution damages fish and other aquatic life. An inexpensive and green wastewater treatment method is adsorption. Adsorbent polymers that remove ammonium ions from wastewater have been explored. Ammonium ions are very hazardous when deposited into surface waters. Surfaces of bentonite and montmorillonite clay may attach sodium ammonium ions. They are cheap and abundant, therefore used to treat drain water. Bentonite outperformed montmorillonite in eliminating ammonium ions from water. Bentonite and montmorillonite clays were used to remove residual ammonium ions. These are utilized for bentonitic and montmorillonitic clays. Both clays were absorbed in a neutral pH, and it was free of sulfuric acid, ammonium ions, and phosphorus ions. Montmorillonitic clay boosted TDS by nearly 10% whereas bentonitic clay only raised TDS by 1%. Adsorption may inexpensively filter water and the surface charge of adsorbents affect their adsorption capacity. Ammonium ions may be recycled, and several bioreactors can remove ammonium ions from liquid and solid phases. Iterate over several models and the Freundlich isotherm model outperforms the Langmuir model by 5%. And bentonite clay adsorbs better due to iron oxide content.

Payment for Environmental Services (PES) is an effort and commitment of the world community in tackling the symptoms of global warming and damage to the ozone layer that will affect global climate change. Using field research methods, research data is collected through in-depth interviews with stakeholders in environmental services return programs in this research area. Research data is analyzed and described qualitatively for further conclusions. The concept developed upstream and downstream watershed relationships through the PES mechanism is based on the principle of voluntary agreement and awareness of maintaining the watershed ecosystem. The experience of implementing the PES Program in the Cidanau Watershed of Banten Province of Indonesia, managed by an independent institution. The PES program, in addition to its role as an environmental conservation program in the Cidanau watershed, also has socio-economical benefits for the community, environmental service (ES) users, and providers.

Nano-chitosan can be produced from blood clams (Anadara granosa) because they contain 14-35% of chitin. The production of nano-chitosan can be conducted by a bottom-up process using sodium tripolyphosphate (Na-TPP). The aims of this study are to produce nano-chitosan from blood clamshell and to study the factor affecting the particle size of nano-chitosan such as the ratio of chitosan to Na-TPP solution (v/v) and rotation speed of the centrifuge. The research shows that The chitin content on blood clamshell is 25.42%. The yield of chitosan from chitin is about 80.92%. The degree of deacetylation of chitin from blood clamshell reaches 63.18%. The effect of the ratio of chitosan to Na-TPP solution (R) and the rotation speed of centrifuge (N) on the particle size of nano-chitosan can be expressed by equation dp = 0.12 (R)0.714 (N)0.99.

The halophilic consortia were enriched from water samples of Abhor, Red Sea, Jeddah, Saudi Arabia for the degradation of phenanthrene, fluorene, hexadecane, pyrene, and treatment of automobile service station wastewater under saline conditions (4%). Complete degradation of phenanthrene and fluorene was recorded up to a concentration of 500 mg.L-1 in 12 days, when the concentration was raised to 800 mg.L-1, the percentage of degradation of the two compounds was recorded by 84 and 90% within 14 days, while when the concentration increased to 1000 mg.L-1, a significant decline was recorded. Pyrene degradation was studied under saline conditions, where it recorded a degradation rate of 92 and 81% at a concentration of 50 and 100 mg.L-1 in 10 and 12 days, respectively, while when increasing the concentration, a severe decrease in the percentage of degradation was recorded that reached 57 and 44% at concentration 200 and 300 mg.L-1, respectively .Hexadecane recorded complete degradation at a concentration of 0.5 and 1%, within 4 and 6 days, respectively, while at a concentration of 1.5%, the rate of deterioration was 88% in 10 days. Record 93% removal of COD in CSTR within 40th day, when treatment of automobile service station wastewater with halophilic bacterial consortia. The existing bacterial strains were classified as potentially responsible for petroleum hydrocarbon degradation and treatment of automobile service station wastewater such as Ochrobactrum, Propionispira, Martelella, Bacillus, Marinobacter, and Azospira. The present study recommends that the hydrophilic consortia can be used in the treatment of automobile service station wastewater under saline conditions.

Biomonitoring is a key solution for assessing the effects and risks of pollutants to preserve the most vulnerable ecosystems, including aquatic ecosystems. This study aims in establishing the gastropod Lymnaea stagnalis, as a sentinel species to assess the water quality of the El-Malah river in the Algerian North-West. Three sites were chosen along the river: upstream (US), midstream (MS), and downstream (DS). The responsiveness of the aquatic snails has been compared using physiological and biological markers: condition index (CI), volumetric condition index (VCI), acetylcholinesterase (AChE), glutathione s-transferase (GST), and catalase (CAT). Additionally, the occurrence of changes in biometric parameters of the specimens has also been treated: shell height (SH), shell thickness (ST) total weight (TW), and the ratio ST/SH. Snails from the site MS reacted in front to the water deterioration with low biometric values (ST 1.28 ± 0.17 cm; SH 1.83 ± 0.20 cm; TW 2.95 ± 0.69 cm), and condition indices values (CI 31.19 ± 3.58; VCI 2.09 ± 0.53 g.cm-3), thereby signaling smaller individuals compared to the population of site US. Whereas, no specimen was recorded in the site submitted to wastewaters discharge (DS). This indicates that the degradation of the water quality affected the growth and the viability of the snails. Furthermore, a significant induction in the GST activity (88.98 ± 10.72 nmol min-1mg-1), and a significant inhibition in the CAT activity (82.85 ± 9.49 μmol min-1mg-1) were recorded in the site MS, whereas no statistically significant variation was observed in AChE activity. L. stagnalis demonstrated biological and physiological variability between the studied contrasting sites of the El-Malah River. These results allow us to propose this species as a model in the ecotoxicology of western Algerian freshwaters.

The ability of the bacterial degradation of low-density polyethylene (LDPE) waste by Lysinibacillus fusiformis isolated from hydrocarbon-contaminated soil was investigated in the present study. The potential of the bacterial isolate to utilize LDPE waste bags of two different thicknesses in a month as a sole carbon source in mineral salt media was assessed. Further, the effect of pretreatment by xylene on the bacterial degradation of LDPE waste bags (0.5 percent w/v) in 30 days was investigated. The isolated Lysinibacillus fusiformis was able to degrade 9.51 percent of LDPE with 30 μm thickness but able to degrade only 1.45 percent of LDPE having 50 μm thickness. The bacterial biomass was 1.77 times higher on LDPE- 30 μm containing media in comparison to LDPE- 50 μm. The xylene pretreatment of LDPE wastes enhanced the biodegradation efficiency of isolated Lysinibacillus fusiformis to 12.09 and 1.97 percent respectively in 30 μm and 50 μm thick LDPE bags. The xylene pre-treatment improved the bacterial growth on media with LDPE of both thicknesses. The adherence of bacterium on the surface of LDPE was found more on 50 μm thick xylene treated LDPE compared to its untreated LDPE than 30 μm thick LDPE films. The xylene pre-treatment of polyethylene waste had an additive effect on the biodegradation of waste LDPE films with a significant effect on thickness.

As part of the agricultural sector, livestock is a source of food for Indonesia and consumers abroad. Therefore, the demand for livestock commodities tends to increase, aligning with the positive growth of the population. Additionally, as part of their efforts to promote higher consumption, one of the attempts made by producers and the government as policymakers is to encourage an increase in the livestock population from time to time. On the other hand, the industrial sector that engages in processing likewise continues to expand to improve products downstream. However, the increase in the number of livestock and industries can contribute to the rise in emissions that impact environmental conditions. In this study, the environmental situation referred to is temperature variations. Moreover, this research aims to determine the impact of livestock population and energy consumption in the industrial sector on temperature changes. The method used in this research is explanatory. The data sources used for multiple linear regression analysis came from the World Bank, Indonesia’s Central Bureau of Statistics (BPS), and the Ministry of Energy and Mineral Resources. The analysis reveals that large and small livestock, as well as energy use in the industrial sector are factors that have an impact on Indonesia’s temperature. Large and small livestock cause an increase in temperature due to the large number of emissions produced by enteric fermentation and excretion. Meanwhile, the rise in energy consumption is inversely proportional to changes in temperature. This condition occurred because of the higher proportion of renewable energy in total energy consumption.

Industrial emissions are a serious environmental problem worldwide due to particulates and toxic gases. This study aims to generate an activity-specific emission inventory and estimate emissions dispersion extent in the vicinity of the coastal industrial village by simulating the existing coke oven and pellet plant emissions using the steady-state plume model. Continuous air quality monitoring results were compared with the predicted consequential emissions for the year 2018-19. The maximum ground-level concentrations of particulate and gases within the modeling simulation domain were observed at 9005 m away from the center. They were predicted to be 116.39 μg.m-3, 79.14 μg.m-3, 52.97 μg.m-3, and 211.86 μg.m-3. Data analysis showed that air mass transport from the project to the receptor sites resulted in ambient air concentrations higher than those observed in the other sites. Overall predicted results obtained from AERMOD Cloud simulations were shown to have less bias than the measured results. They recommended considering it as appropriate for the prediction of annual average concentration.