The present disclosure provides a recirculating aquaculture system comprising a) a wastewater treatment system and b) a polyhydroxyalkanoate (PHA) production system. In particular, poly(3-hydroxybutyrate) (PHB) can be utilized as the PHA in such a system. Methods of treating wastewater for reuse by contacting the wastewater with one or more zeolites to remove material from the wastewater and reusing the treated wastewater are also provided as well as methods of producing a PHA such as PHB from organic waste. Moreover, food compositions comprising a PHA biomass as well as associated methods are also provided.

Methods and compositions for remediating wastewater formed by water and contaminants, which may include per- and poly-flouroalkyl substances (PFAS), using a wastewater treatment system including a collecting unit, a dewatering unit, a drying unit, and a baking unit. Wastewater provided to the collecting unit is dosed by adding a compound to the wastewater in an amount that is sufficient to cause the contaminants to separate from the water and to form a sludge. The compound can include combinations of salts, glacial acetic acid, chitosan, and water. The sludge is dewatered with the dewatering from a first dryness level a second dryness level. The dewatered sludge is then dried in the drying unit from the first dryness level to a third dryness level. The dried sludge is then baked at a sufficiently high enough temperature that chemical bonds of at least a portion of the contaminants are destroyed.

A method for remediating wastewater formed by water and per- and poly-fluoroalkyl substances (PFAS) using a wastewater treatment system that includes a collecting unit, a dewatering unit, a drying unit, and a baking unit. Wastewater provided to the collecting unit is dosed by adding a compound to the wastewater in an amount that is sufficient to cause the PFAS to separate from the water and to form a sludge. The sludge is dewatered with the dewatering from a first dryness level a second dryness level. The dewatered sludge is then dried in the drying unit from the first dryness level to a third dryness level. The dried sludge is then baked at a sufficiently high enough temperature that chemical bonds of at least a portion of the PFAS is destroyed.

An enhanced coagulation method for removing microplastics in water is provided. First, a certain amount of inorganic suspended particles are added to microplastic wastewater to increase the number of particles and thereby improve a collision probability among the particles; and then a natural polymer flocculant and a polysilicic acid are added. The polysilicic acid is used as coagulant aid, so that the three materials can comprehensively achieve the purpose of removing the microplastics in the wastewater. The enhanced coagulation method can combine respective characteristics and advantages of the three materials, so that the three materials can mutually complement each other and give full play to the role of charge neutralization and bridging and net capturing, strengthen the sedimentation performance and enhance the actual microplastic removal effect. Therefore, it is a green and environmentally-friendly enhanced coagulation technology.

Disclosed herein is a liquid pod comprising a liquid composition comprising at least two of a Solvent A, a Solvent B, an Active, a Modifier, and an Adjuvant, wherein the water treatment liquid composition is disposed within a packet comprising a water-soluble polymer film.

A sequential batch reactor wastewater treatment system and method, a material combination for practicing the method, and a fertilizer co-product deriving therefrom. A pH lowering agent comprising an acid lowers the pH of wastewater. A first compound including chitin or chitosan comprises a filtering medium, a coagulant, and a flocculant, and a second compound comprises an adsorbent and a pH raising agent. Wastewater is mixed and aerated subsequent to introduction of each of the first and second compounds, and flocculation yields treated water and a sludge byproduct that may be dewatered and further processed to yield a useful fertilizer co-product. Within the first compound, diatomaceous earth operates as a filtering medium and bentonite clay acts as a coagulant and filtering medium. Within the second compound, activated carbon, calcium oxide (CaO), and caustic soda (NaOH) are operative to adsorb, disinfect, and raise the pH of the wastewater.

A method of water treatment includes providing water that includes at least one contaminant. An effective amount of at least one filter media is added to the to the water that includes at least one contaminant. The water and the at least one filter media are agitated to form a homogeneous mixture. A cationic biopolymer is added to the homogeneous mixture of water and the at least one filter media. The water is separated from the at least one contaminant and the at least one filter media.

A method for treating sewage to avoid sludge dumping. The sewage treatment method is a multistage process for sanitizing raw sewage and producing easily managed environmentally safe byproducts. Raw sewage or partially treated sewage is processed to remove and treat any liquids leaving sterilized solids that are compacted for limiting the environmental footprint. The method employs mechanical, thermal, radiation, and chemical treatments to the sewage to produce safe biodegradable materials. The treated final product may be used as fertilizer, fillers, aggregate, or compost.

A porous biological polymerizing agent for sediment dewatering in environmental dredging of rivers and lakes is disclosed, which is obtained by thoroughly mixing 50 wt % to 70 wt % of an agent A and 30 wt % to 50 wt % of an agent B into irregular spheres of 1 mm to 3 mm, and crushing the irregular spheres into solid particles with a particle size of ≤20 mesh, and the solid particles have a pH of 5.0 to 6.0. The agent A is obtained by thoroughly mixing 10 wt % to 30 wt % of cellulose, 20 wt % to 50 wt % of starch, and 20 wt % to 40 wt % of amino acid; and the agent B is obtained by thoroughly mixing 40 wt % to 70 wt % of saccharifying enzyme (SE) and 30 wt % to 60 wt % of citric acid.

A chitosan-based flocculant has the optimal adjustment of metal salts, alcohols and acids, which allow an all-in-one product to be obtained. A product with compatibility with the main disinfection agents is used in water treatment, which is functional product and is applied in more practical manner, and therefore offers a competitive advantage to end users.