The present invention relates to microbial carriers for wastewater treatment, and in particular, relates to an organic composite powder carrier and its application for strengthening biological denitrification in municipal wastewater treatment. The organic composite powder carrier is compounded by a microbial carrier with a relatively large equivalent particle size and an organic alternative carbon source in the form of ultrafine powder. The composite powder carrier in the present invention includes a dedicated organic alternative carbon source, such as polyhydroxyalkanoates (PHA). The organic alternative carbon source can exclude the competitive relationship between microorganisms to ensure that denitrifying bacteria exclusively obtain electron donors required for denitrification. The composite powder carrier strengthens biological denitrification in municipal wastewater treatment, significantly improves denitrification efficiency, realizes deep biological purification of wastewater and ensures that the subject effluent complies with the strictest domestic discharge standards.

The present application discloses a Bacillus sp. producing a bioflocculant and a biosurfactant. The microbial classification of the Bacillus sp. is named Bacillus sp. SS15, which has been preserved in China Center for Type Culture Collection on Mar. 29, 2021, and its preservation number is CCTCC M2021295; the 16S rRNA sequence of SS15 is shown as SEQ ID NO.1. Bacillus sp. SS15 obtained by the present application has the function of simultaneously producing a bioflocculant and a biosurfactant. The bioflocculant and biosurfactant produced by Bacillus sp. SS15 of the present application not only have high activity, but also show strong tolerance in the ranges of pH (2-12), temperature (4° C.-100° C.) and salinity (0-100 g/L). Meanwhile, they can be applied to the remediation of a fracturing flowback liquid and can effectively promote the removal of chroma, suspended solids, COD, n-alkanes and polycyclic aromatic hydrocarbons at the same time.

An efficient multi-dimensional carbon source and a method for preparing the same are disclosed. The efficient multi-dimensional carbon source includes the following components by weight: 30%-50% of alcohols, 20%-30% of biomass digestive liquid, 1%-10% of carbohydrates, 0.5% of polymethyl methacrylate and balance of water. A method for preparing the efficient multi-dimensional carbon source is further disclosed.

A filter system and filter suitable for water treatment includes a filter having a housing with a water inlet and an outlet, the housing defining a filtration chamber therein. The filtration chamber has filter media therein having a plurality of at least partially porous filtration beads and a pump for pumping water to the inlet. Such a filtration system enables high nutrient removal thus minimising the food source for algae.

A scalable phytoremediation system that uses rock medium supporting a Salicaceae (poplar or willow) tree rhizosphere in a basin with controllable volume and water depth that results in tertiary treatment requirements for organic BOD, pathogens, ammonia-nitrogen, nitrate-nitrogen and phosphorous pollutants and PFAS. COC removal is achieved by pollutant sorption, plant uptake and increased microbial mineralization activity. Phyto basin achieves faster pollutant mineralization to achieve regulated water quality standards. The Basin reactor system uses photosynthesis and rhizosphere dynamics to create a predictable reactor into carbon-rich microbial biomass to remove waste water pollutants (COC). The Basin uses <10% of the energy required for alternative tertiary treatment system. The Basin COC treatment functions year-round including through the trees dormant season.

The disclosure relates to a method for enhancing methanogenesis in anaerobic digestion of municipal sludge by utilizing a filter screen structure, comprising: arranging a filter screen structure with titanium or titanium alloy as the framework and Fe.sub.3O.sub.4 as the coating in the anaerobic digestion system to accelerate the rate of hydrolysis and acidification, and increase the proportion of methane in biogas. Compared with the prior art, the disclosure increases the contact between Fe.sub.3O.sub.4 and anaerobic microorganisms by means of the screen structure; the stable crystal structure of Fe.sub.3O.sub.4 ensures the sustainability as an electron carrier while enriching electroactive microorganisms; titanium or titanium alloy, as a material with high strength, corrosion resistance, good biocompatibility, and good conductivity, can form a good match with Fe.sub.3O.sub.4 and assist in promoting the electron transfer; the disclosure has the advantages of low cost, high income, no need of repeated dosing and stable effect, and could strengthen the oxidation and decomposition of organic matter in the anaerobic digestion, accelerate the rate of methanogenesis, and increase the gas production.

The disclosure relates to a treatment method for sludge utilization in a sewage treatment plant, in particular to a method for reducing heavy metal content of sludge-based biocoke. The disclosure includes following steps (1) to (5): step (1): concentrating a residual sludge produced by a municipal sewage treatment plant to be with a moisture content of 95-98%; step (2): conditioning the concentrated sludge in a sludge bioleaching tank for 48 hours, with a pH value of the sludge being reduced to below 4.5; step (3): pumping the conditioned sludge into a high-pressure diaphragm plate and frame for a press filter dewatering to obtain a dewatered cake with a moisture content less than or equal to 50%; step (4): delivering the dewatered cake into a sludge dryer for crushing, heating and drying to obtain the dried sludge with a moisture content of 15-22%; and step (5): carbonizing the dried sludge into sludge-based biocoke at a high temperature in a pyrolytic carbonization device with a carbonization temperature of 500-650° C.

A method for the anaerobic cultivation of microorganisms includes providing an aqueous solution having a pH value of 4.5 to 7.5 in a container, adding a substrate in a first substrate dosage to the aqueous solution, adding further elements to the aqueous solution, adding an inoculant with microorganisms to the aqueous solution, hermetically sealing the container, varying a temperature in a range from 40 to 80 degrees Celsius, taking a reference liquid sample and determining a first concentration of organic substance in the reference liquid sample, taking another liquid sample and determining another concentration of organic substance in the further liquid sample after the expiration of the first waiting time, if the further concentration of organic substance is smaller than 10 percent of the first concentration of organic substance, adding substrate in another substrate dosage, repeating until a sufficient amount of biomass is present in the container.

A hydromulch composition compromising an oil-extruded cottonseed meal processed from a non-delinted cottonseed. The oil-extruded fuzzy cottonseed meal can optionally be combined with one or more super absorbent polymers, such as polyaspartate and polyacrylate polymers and other additives. The hydromulch composition can additionally include one or more microorganisms including but not limited to bacteria and mycorrhizae configured to provide symbiotic relationship with treated soil and plants to increase water and nutrient uptake in the treated plants or soil. The hydromulch composition can further be combined with a dispersant, such as water to make slurry for spray on application to a desired treatment surface.

The present invention relates to systems and methods for removing selenate and/or selenite from water and recovering elemental selenium.