How to reduce biomass production from wastewater?
Photosynthetic bacteria (PSB) wastewater treatment is a novel technology for wastewater purification and resources recovery but is restricted by low efficiency. This paper applied zero-valent iron nanoparticles (Fe 0 NPs) to enhance its performance. Results showed that 20 mg/L Fe 0 NPs under light-anaerobic condition significantly increased the PSB biomass production and …
What are the essential aspects of aerobic biological wastewater treatment?
Algal biomass production associated with wastewater is usually carried out in high rate algal ponds (HRAPs), which are concomitantly used in the treatment of such effluent. However, most types of wastewater have high levels of bacteria that can inhibit the growth of algal biomass by competing for space and nutrients.
How much sludge is produced in a wastewater treatment plant?
Feb 04, 2019 · Inlet tunnels, process halls, de-nitrification processes, and sludge treatment will be refurbished to improve the nitrogen removal, enhance the sludge management, and increase the biogas production. After the project is completed in 2021, VEAS will be able to continue to treat wastewater treatment for another 15 to 25 years.
How to reduce wastage rate of water pollution?
Aug 29, 2017 · Wastewater treatment plants usually produce sludge during the final stage of the process; around 0.25 percent to 12 percent of the sludge’s weight is solid. The sludge taken out from wastewater has to be stabilized, thickened and disinfected, before it can be taken to final disposition. This process, however, is not mandatory in Mexico, due ...
How can I improve my biomass microalgal?
In order to enhance microalgal biomass, improved photosynthetic efficiency is essential. This can be accomplished by the manipulation of the light spectrum to achieve an optimal balance between photosynthesis and photoprotection. Manipulation of incident irradiance may be viable for increased light harvesting by algae.
What biomass is used for waste water treatment?
Purifying biomass that develops in an activated sludge or on any support medium (e.g. biolite, trickling filters supports …) consist of a thoroughly mixed blend of: living or dead micro-organisms: "true" bacteria and Actinomycetes (e.g. Nocardia);
What is required for biomass productivity?
21.2. The mathematical models used to predict biomass productivity and water demand require solar irradiance, air temperature, wind velocity, relative humidity, and precipitation as input parameters.
How can we recover nutrients from wastewater?
Highlights. Chemical precipitation plays an important role in recovering nutrients. Membrane filtration process is highly recommended for the nutrients recovery. Economic analysis is necessary for the nutrients recovery from wastewater.
Why algae is used in wastewater treatment?
Algae benefit wastewater treatment by producing oxygen that allows aerobic bacteria to breakdown organic contaminants in the water and taking up excess nitrogen and phosphorus in the process. It is also a sustainable and affordable alternative to current wastewater treatment practices.
Which microalgae is used for wastewater treatment?
A number of studies have reported successful cultivation of several species of microalgae such as Chlorella, Scenedesmus, Phormidium, Botryococcus, Chlamydomonas, and Arthrospira for wastewater treatment and the efficacy of this method is promising (Olguì, 2003; Chinnasamy et al., 2010; Kong et al., 2010; Stephens et ...Mar 19, 2019
How can you increase biomass production?
Many experimental results (see for example FAO, 1986; Vanketeswarlu, 1987) indicate that there is a potential for increasing biomass production within a given water resource, by combining water conservation, soil management, protective irrigation, and the use of external inputs (fertilizers, improved crop varieties, ...
What are the methods of producing biomass?
Direct combustion is the most common method for converting biomass to useful energy. All biomass can be burned directly for heating buildings and water, for industrial process heat, and for generating electricity in steam turbines. Thermochemical conversion of biomass includes pyrolysis and gasification.Jun 8, 2021
How is biomass produced?
Biomass is produced by green plants converting sunlight into plant material through photosynthesis and includes all land- and water-based vegetation, as well as all organic wastes. The biomass resource can be considered as organic matter, in which the energy of sunlight is stored in chemical bonds.
How can nitrogen be recovered from wastewater?
Nitrogen removal takes place after primary settling through biological treatment. In addition to biological treatment for nitrogen removal, many wastewater treatment plants have implemented anaerobic digestion of municipal sludge to produce biogas and increase the dewaterability of the sludge.Apr 1, 2020
Why is it necessary to remove nutrients from wastewater?
Nutrient removal from wastewater is essential to prevent eutrophication in receiving waters (Barsanti and Gualtieri, 2006; de-Bashan and Bashan, 2004; Olguin, 2003) or disruptions with chlorine disinfection (Ahn, 2006). Table 12 shows nutrient concentrations in various types of wastewater.
What is nutrient recovery?
Nutrient recovery is the practice of recovering nutrients such as nitrogen and phosphorus from used water streams that would otherwise be discarded and converting them into an environmental friendly fertilizer used for ecological and agricultural purposes.Feb 10, 2015
What is wastewater in agriculture?
The Food and Agriculture Administration defines wastewater as “water with no immediate value for the purpose in which it was used nor for the purpose it was produced for, due to its quality, quantity or to the moment it was disposed of. However, wastewater of a user can be supplied to another user in another place.”.
What is the law of conservation of matter?
The Law of Conservation of Matter states: Matter is not created or destroyed, it only becomes. Is there a link between such law, wastewater and biomass? As it is well known, biomass is understood as any element obtained by photosynthesis, which can be transformed into a useful fuel for the human being.
What is biomass used for?
biomass used in wastewater purification. aquatic organisms. importance of aquatic micro-organisms for the water treatment specialist. micro-organisms for which freshwater is their natural habitat. pathogenic micro-organisms. biomass used in wastewater purification.
Why is chemical treatment necessary?
In most cases, a chemical treatment will be essential in order to rapidly reinstate normal operations; nevertheless, it is only by eliminating the cause (s) that we can avoid a chronic recurrence of the problems.
What is the first step in the Eikelboom method?
The first step consists in prioritising a quick and practicable method using an optical microscope, without any incubation time or biochemical testing , such as the widely used Eikelboom method that is based on easily interpreted morphological descriptions.
Can microfauna be seen under a microscope?
Unlike bacteria, microfauna in activated sludge and in attached growth biofilms, consisting in protozoa and metazoa (see animal kingdom ), can easily be seen under an optical microscope; as the microfauna is particularly sensitive to changes in the medium, it provides information on the extent to which the biomass adapts and is indicative of the "stress" it has suffered.
What is biological wastewater treatment?
Biological wastewater treatment involves the transformation of dissolved and suspended organic contaminants to biomass and evolved gases (CO 2 , CH 4 , N 2 and SO 2) which are separable from the treated waters. Excess biomass produced within processes must be disposed of and may account for 60% of total plant operating costs ( Horan, 1990 ). In addition, recent European legislation requires that more wastewaters receive biological treatment prior to discharge ( 91/2711EEC, 1991 ), resulting in a considerable increase in the production of biomass, but this is also restricting options for its disposal ( Boon and Thomas, 1996 ). There is therefore considerable impetus to develop strategies for reducing the amount of biomass produced.
What are the parameters of activated sludge?
These are the return biomass flowrate to the aeration basin and the biomass wastage flowrate. Return of biomass influences biomass concentration in the aeration basin. Manipulation of the wastage rate is employed in control strategies providing either a constant Food to Microorganisms (F/M) ratio or to regulate the mean residence time of cells within the process, often referred to as the sludge age. The F/M ratio describes the amount of substrate that a given amount of biomass is utilising. It follows from Eq. (6) that a low F/M ratio would result in lower biomass production.
What is secondary sludge?
Secondary sludges contain inert solids and biological solids, collectively called biomass, the latter being derived through metabolism of pollutants. The purpose of sludge wastage is to purge the inert solids and remove excess biological solids in order to prevent accumulation of these solids within the system. Reducing the production of excess biomas s will reduce the required wastage rate.
