The invention relates to a method for treating an aqueous fluid comprising a biodegradable organic substance in an installation comprising an upflow bioreactor containing a sludge bed, said sludge bed comprising biomass, an external separator, and a conditioning tank, comprising treating the fluid in the conditioning tank; feeding the treated fluid into a lower part of the bioreactor and forming biogas; withdrawing the fluid from an upper part of the bioreactor, which withdrawn fluid comprises biomass; feeding the aqueous fluid withdrawn from the upper part of the bioreactor into the external separator wherein the aqueous fluid comprising the biomass is separated into a liquid phase, and a fluid phase enriched in biomass; returning said fluid phase enriched in biomass from the external separator to the bioreactor; and returning a part of said liquid phase to the conditioning tank.

Provided herein are methods of organic waste stream conversion including fermenting an organic waste stream with an inoculum using arrested methanogenesis to generate an organic product. The inoculum includes an anaerobic consortium isolated from cheese, yogurt, saline soil, kefir, and/or probiotics and the anaerobic consortium is pretreated to transform the anaerobic consortium into an acidogenic consortium

A process for purification of waste water from dairy processing, which may include providing waste water from the dairy-processing industry that includes lactic acid and urea; adjusting the waste water to an alkaline pH value, while precipitating the lactic acid as a lactate; subjecting the waste water to a first reverse osmosis step, obtaining a lactate-containing first retentate and a lactate-free first permeate; adjusting the first permeate such obtained to an acid pH value; cooling the permeate that has been adjusted to an acid pH to a temperature within the range of 2 to 10° C.; subjecting the cooled first permeate to a second reverse osmosis step, obtaining a urea-containing second retentate and a second permeate that is practically completely free from organic loading; and, optionally, recycling the second permeate, reintroducing it into a dairy-processing procedure.

Process for treating an aqueous fluid whereby a biogas is produced in an installation comprising a bioreactor and a separate container, the process comprising (i) a bioreactor feeding stage; (ii) a batch reaction stage, wherein biogas is formed and formed biogas is temporarily stored in the separate container, and at least one further stage (iii) comprising a settling stage and/or an aqueous fluid effluent discharge stage, wherein the biogas stored in the separate container is used to reduce fluctuations in a biogas exit flow from the installation. An installation for carrying out the process and the use thereof.

A method may add whey to high calcium papermaking industrial wastewater blended and pre-acidification treatment to promote anaerobic reaction and inhibit calcification. The method includes, before anaerobic treatment of papermaking wastewater, mixing whey wastewater with the papermaking wastewater. The method also includes pre-treating the papermaking wastewater by acidification to stabilize the papermaking wastewater prior to entering an anaerobic reaction system.

A method may add whey to high calcium papermaking industrial wastewater blended and pre-acidification treatment to promote anaerobic reaction and inhibit calcification. The method includes, before anaerobic treatment of papermaking wastewater, mixing whey wastewater with the papermaking wastewater. The method also includes pre-treating the papermaking wastewater by acidification to stabilize the papermaking wastewater prior to entering an anaerobic reaction system.

A vermicomposting system for treating waste water streams that includes a pretreatment stage for converting liquid or semi-liquid organic waste streams into a feedstock for vermicomposting; a vermicomposting digestion stage having populations of worms and beneficial bacteria which consume and break down organic material and nutrients present in the feedstock from the pretreatment stage to create worm castings, vermicompost, and a liquid compost tea that contains plant nutrients, plant growth promoting substances, and beneficial bacteria; and a post-treatment stage in which the liquid compost tea is removed for use as an soil amendment or inoculant, or is further treated in a separate containment tank where nutrients and oxygen levels are controlled to increase specific bacterial and fungal populations.

A system for treating organic feedstock, particularly livestock or poultry wastewater. The system employs combined anaerobic and aerobic digestion for converting the wastewater into safe water, fertilizer, and energy, wherein sequencing batch reactors (i.e. ASBR and SBR) are used for the digestion process.

The present invention relates to a method of wastewater treatment in which a filter aid prepared by extrusion of freshly harvested wet lignocellulosic feedstocks or by extrusion of wet lignocellulosic feedstocks having dry matter content 30-75% (w/w) is used to collect sewage sludge and the combined spent filter aid with collected sewage sludge is used for hydrothermal conversion.

A process and system for reducing biochemical oxygen demand (BOD) of food and beverage processing effluents.