There are provided a sludge treatment device 100 and a sludge treatment system 400 comprising: a primary tank 110 into which a liquid flows from a machine tool 300 side; a secondary tank 120 from which a liquid inside flows out to the machine tool 300 side; a first flow path 130 that supplies the liquid in the primary tank 110 to the secondary tank 120; a filter 134 disposed on the first flow path 130; a second flow path 140 different from the first flow path 130 connecting the primary tank 110 and the secondary tank 120; and a liquid inflow amount adjustment means 142 configured to adjust an inflow amount of liquid flowing from the secondary tank 120 into the primary tank 110 through the second flow path 140, wherein a second flow path liquid supply path 150 is provided to cause the liquid in the primary tank 110 to flow from the secondary tank 120 side toward the primary tank 110 side from a middle of the second flow path 140.

Systems and methods for applying a chemical treatment solution to a process stream in an industrial processing system while the system is online. The method includes measuring a real-time pH of the process stream, determining a dosage of the chemical treatment solution based on a relationship between the dosage and a scale saturation parameter that is calculated based on the real-time pH of the process stream, and controlling application of the chemical treatment solution to the process stream based on the determined dosage.

A process cooling water (PCW) system and method for an iron or steelmaking application, the PCW system and method including: sampling a plurality of characteristics of PCW using a plurality of sensors; calculating one or more of Langelier Saturation Index (LSI) and Ryznar Stability Index (RSI) based on the plurality of characteristics using a LSI/RSI measurement unit coupled to the plurality of sensors; and injecting one or more anti-scalant chemicals into the PCW responsive to the calculated one or more of the LSI and the RSI in real time using an anti-scalant injection system to thereby control scale formation in the PCW.

A method for eliminating legionellae from water of a cooling circuit of industrial plants, in particular of a hot rolling mill, is disclosed. The water is loaded with organic substances and inorganic particles. In a further aspect, the use of bacteria for eliminating legionellae from a water of a cooling circuit of an industrial plant is disclosed.

A system for processing air, water, and solid waste material and method of use. The system for processing waste material comprises a tubular reactor through which waste material is passed. The tubular reactor comprises an inductor configured to produce a rotating magnetic field. A plurality of needle-shaped ferromagnetic elements are disposed within a cylindrical working zone of the reactor. The needle-shaped ferromagnetic elements oscillate reaching several thousand periods per second. The system and method for processing natural, synthetic and waste material utilizes micro-pulse micro-arc processing of the material in the rotating magnetic fields to convert organic and inorganic waste into purified raw materials that are usable with minimal reprocessing.

The present invention discloses a high-purity separation method of iron ions from an aqueous solution containing heavy metal ions, wherein after pretreatment of an aqueous solution containing heavy metal ions, sedimentation containing iron ions are collected, nitric acid or sulfuric acid is added for dissolution, and then a reducing agent is added to the dissolved solution; and after heating and sealing reaction, red sedimentation is generated at the bottom, The sedimentation has a high purity, and the residual amount of iron in the solution is less than 0.4 mg/L. In the method, iron ions in the solution can be converted to hematite crystals at a high purity, and the solution has an excellent retention rate of heavy metal ions, the reaction time is short, the separation efficiency is high, the operation is simple, and the cost is low.

A method for preparing an anion adsorbent may be provided, which comprises the steps of: mixing at least two metal salts with each other, thereby forming a stack structure in which cationic compound layers and anionic compound layers containing anions and water of crystallization are alternately stacked on one another; performing a first heat treatment on the stack structure to expand between the cationic compound layers, thereby preparing a preliminary anion adsorbent; and performing a second heat treatment on the preliminary anion adsorbent to remove the anions and the water of crystallization from the anionic compound layers while allowing at least one of the anions to remain, thereby preparing the anion adsorbent.

The disclosure discloses an online resourceful treatment method of electroless copper plating waste solution. According to the disclosure, a copper catalyst is adopted to perform autocatalytic reaction on electroless copper plating waste solution in an autocatalytic reactor, copper simple substances are reduced from copper ions in the waste solution and recycled, the treated waste solution enters into a three-dimensional electrolyzer and a membrane filtration plant for further purification, the finally treated electroless copper plating waste solution meets water quality discharge standard, and the recovery rate of the copper simple substances can reach up to above 95%.

A process for the treatment of acidic wastewater which comprises hydrochloric acid, nitric acid as an optional component, 0.1 to 30 wt.-% of one or more dissolved metals selected from the group consisting of aluminum and heavy metals other than precious metals, and 10 to 500 wt.-ppm of at least one dissolved precious metal, wherein the process comprises the successive steps (1) to (5): (1) adjusting the pH value of the wastewater to 6 to 8 to produce a first composition comprising a first precipitate and an aqueous phase having a pH value in the range of 6 to 8, (2) adjusting the pH value of the first composition to >8 to 11 to produce a second composition comprising the first precipitate, a second precipitate and an aqueous phase having a pH value in the range of >8 to 11, (3) separating the precipitates from the aqueous phase, (4) passing the aqueous phase through a sand filter to produce an aqueous filtrate, and (5) passing the aqueous filtrate through a regenerative cation exchanger comprising an acidic cation exchanger resin with chelating groups and a downstream non-regenerative cation scavenger comprising a scavenger resin with chelating sulfur containing groups to produce an aqueous salt solution with a total content of dissolved aluminum plus dissolved precious metals plus dissolved heavy metals other than precious metals of 0.1 to 10.0 wt.-ppm.

Methods and systems are described for treating water in a water system that includes a biofilm with acid-producing bacteria. The biofilm can be treated, reduced, or eliminated by adding chlorite to the water and reacting the chlorite with acid generated by the acid-producing bacteria to form chlorine dioxide. The chlorine dioxide is thus formed in situ localized to the biofilm, and can be effective to kill bacteria in the biofilm.