Entrapment of methane-producing microorganisms between semi-permeable synthetic membranes in a multi-layer membrane bioreactor (MMBR) was studied and compared to the digestion capacity of a free-cell digester, using a hydraulic retention time of one day and organic loading rates (OLR) of 3.08, 6.16, and 8.16 g COD/L·day. The reactor was designed to retain bacterial cells with uprising plug flow...

Methanosarcina species with a high maximum specific growth rate (mumax) and high half-saturation coefficient (KS) and Methanosaeta species with a low mumax and low KS are the only known aceticlastic methanogens. Because of Methanosaeta's low KS, the low acetate concentrations in conventional, mesophilic anaerobic digestion yield Methanosaeta dominance. However, Methanosarcina absorbs increases ...

BACKGROUND Although the U.S. Environmental Protection Agency has a long history of using risk-based approaches for regulatory purposes, pollutant limits for pathogens in biosolids are not currently based on quantitative risk assessments. OBJECTIVES We developed and demonstrated a risk-based methodology for assessing the risk to human health from exposure to pathogens via biosolids. MATERIAL...

a recent study. The process uses a digester system with microorganisms to break down organic waste into fertiliser. The resultant fertiliser was used in a low-energy greenhouse to produce a range of food crops. The method is a potential way to utilise food waste and reduce the energy consumption of food production as part of a circular economy. New system to convert food waste into fertiliser f...

Industrial systems generate a lot of information for operators. Increased measurement information flow might cause difficulties for the process operators to observe the process states and faulty process operation. In this study, measurements and statistical variables are combined by fuzzy logic to generate key factors for several points in the continuous cooking digester. The overall diagnosis ...

There is a great need to implement low-cost and user-friendly methods for further propagation of biogas technology in India. Environment unfriendly disposal of floral waste causes serious environmental pollution. Literature shows a limited research work regarding the anaerobic digestion of floral waste for biogas generation.  The present experimental work aims to propagate floral waste as a sus...

The Integrated Agriculture System in Indonesia was established 2009. By the end of 2018, 752 small-scale anaerobic digestion (AD) systems treating beef cattle manure were successfully installed. In this study, system studied comprehensively at first attempt by considering current operating conditions, actual performance digester, and site-specific factors for biogas production. Compost bio-urin...

This study seeks to evaluate the economic implication of a biogas digester built from composite material ascertain its cost effectiveness. The feasibility conducted indicates that brick made only fixed dome costs between USD 3193.99 and 4471.59. high is attributed construction material, thus prompting need use materials lower for affordability sustainability. Hence, under was comprising high-de...

Abstract Recovery of phosphorus (P) from wastewater is a topic great interest. Besides being non-renewable resource, P discharge in receiving waters can trigger algae blooms. The present study aimed to quantify the removal two sites at treatment plant using calcined eggshell (CES) as adsorbent. CES was prepared raw shells 600 °C (CES600) and 800 (CES800). proved be an efficient material for rem...