A waste treatment process utilizes a two-stage digestion process with a thermophilic digester, a heat exchanger, and a mesophilic digester. The pH of the thermophilic digestate is increased by removal of carbon dioxide with an air stripper, or by adding a pH increasing reagent upstream of the heat exchanger. The pH adjustment of the digestate protects the heat exchanger and downstream equipment and processes from struvite formation. A struvite reactor may be located in various locations downstream of the heat exchanger to produce a treated digestate or effluent that contains struvite, which can optionally be recovered for beneficial use.

A waste treatment process utilizes a two-stage digestion process with a thermophilic digester, a heat exchanger, and a mesophilic digester. The pH of the thermophilic digestate is increased by removal of carbon dioxide with an air stripper, or by adding a pH increasing reagent upstream of the heat exchanger. The pH adjustment of the digestate protects the heat exchanger and downstream equipment and processes from struvite formation. A struvite reactor may be located in various locations downstream of the heat exchanger to produce a treated digestate or effluent that contains struvite, which can optionally be recovered for beneficial use.

A process for treating waste fluid generated during a petrochemical process. The process comprises: subjecting at least one first water-based wastewater stream to at least one freeze concentration stage so as to produce a third clean water stream and a fourth concentrated water-based wastewater stream, subjecting at least one second organic fluid-based waste fluid stream to at least one separation stage so as to produce a fifth purified product stream and a sixth concentrated organic fluid-based waste fluid stream, forwarding the fourth concentrated water-based wastewater stream and the sixth concentrated organic fluid-based waste fluid stream to an incinerator, and incinerating the streams in the incinerator. The process is controlled such that incineration of the sixth concentrated organic fluid-based waste fluid stream generates at least 70% of an energy necessary to incinerate the fourth concentrated water-based wastewater stream.

The present disclosure relates to bioremediation systems and methods for wastewater treatment in heavy industry, including the mining industry. A benefit of the systems and methods disclosed herein can include the reduction of heavy metals in wastewater. Another benefit can be the treatment of acidic wastewater to achieve higher pH levels. An additional benefit can be the use of carbon dioxide to raise the pH level of acidic wastewater, or to produce feedstocks for the growth of anaerobic or aerobic microorganisms that are capable of reducing a concentration of heavy metals in wastewater. A benefit of the systems and methods herein can include the treatment of acid mining drainage wastewater, as well as heavy metal removal from other industrial wastewater. Another benefit of the methods and systems disclosed herein can include reduction of excess carbon dioxide from the environment.

The present disclosure relates to bioremediation systems and methods for wastewater treatment in heavy industry, including the mining industry. A benefit of the systems and methods disclosed herein can include the reduction of heavy metals in wastewater. Another benefit can be the treatment of acidic wastewater to achieve higher pH levels. An additional benefit can be the use of carbon dioxide to raise the pH level of acidic wastewater, or to produce feedstocks for the growth of anaerobic or aerobic microorganisms that are capable of reducing a concentration of heavy metals in wastewater. A benefit of the systems and methods herein can include the treatment of acid mining drainage wastewater, as well as heavy metal removal from other industrial wastewater. Another benefit of the methods and systems disclosed herein can include reduction of excess carbon dioxide from the environment.

A system and method for treating reverse-osmosis (RO) concentrated water with high temporary hardness. The system includes a crystallization unit, a precipitation unit, a dewatering unit, and a programmable logic controller (PLC) system. The crystallization unit, precipitation unit and dewatering unit are connected in series, and the PLC system is configured to control pumps, valves, and displays in the crystallization unit, precipitation unit and dewatering unit. The crystallization unit includes a storage tank and a crystallization reactor communicated therewith. The crystallization reactor is provided with a pH meter, a liquid-level gauge, and a stirrer. A connection pipe between the crystallization reactor and the RO concentrated water is provided with an inlet pump and a inlet valve. A connection pipe between the crystallization reactor and the storage tank is provided with a feeding pump and a feeding valve.

A system and method for treating reverse-osmosis (RO) concentrated water with high temporary hardness. The system includes a crystallization unit, a precipitation unit, a dewatering unit, and a programmable logic controller (PLC) system. The crystallization unit, precipitation unit and dewatering unit are connected in series, and the PLC system is configured to control pumps, valves, and displays in the crystallization unit, precipitation unit and dewatering unit. The crystallization unit includes a storage tank and a crystallization reactor communicated therewith. The crystallization reactor is provided with a pH meter, a liquid-level gauge, and a stirrer. A connection pipe between the crystallization reactor and the RO concentrated water is provided with an inlet pump and a inlet valve. A connection pipe between the crystallization reactor and the storage tank is provided with a feeding pump and a feeding valve.

A system for treating printed circuit board wastewater (PCB) includes a production system, a pretreatment system, a biochemical system, a recovery system and a concentrated water treatment system. The production system is configured for producing process water and auxiliary water from tap water. The pretreatment system is configured to pretreat different wastewater samples separately. The biochemical system is configured to decompose the pretreated wastewater. The recovery system is configured to treat wastewater from the pretreatment system and the biochemical system to obtain process water and feed concentrated water to the concentrated water treatment system. The concentrated water treatment system is configured to treat the concentrated water to meet a discharge standard. A treatment method for the PCB wastewater is also provided.

A system for treating printed circuit board wastewater (PCB) includes a production system, a pretreatment system, a biochemical system, a recovery system and a concentrated water treatment system. The production system is configured for producing process water and auxiliary water from tap water. The pretreatment system is configured to pretreat different wastewater samples separately. The biochemical system is configured to decompose the pretreated wastewater. The recovery system is configured to treat wastewater from the pretreatment system and the biochemical system to obtain process water and feed concentrated water to the concentrated water treatment system. The concentrated water treatment system is configured to treat the concentrated water to meet a discharge standard. A treatment method for the PCB wastewater is also provided.

The disclosure provides two integrated methods for the production of potable water from seawater or other brackish waters using chemical forced precipitation. The process is closed loop. It recycles process reactants and produces commercially valuable potable water and salts. The technology uses a computer software method of process variable control that maintains the chemical forced precipitation process salt, solvent, and water concentrations as required to optimize water production. The process fortuitously requires less energy than other water production processes and can utilize solar hot water heating or waste heat from other combustion and seawater for heating and cooling energy sources.