An electrostatic air precipitator electrode system where the particle collecting electrode or the particle collecting electrode and the repelling electrode are made of a unitary conductive polymer material, preferably a conductive synthetic polymer material. Parts of the conductive synthetic polymer collecting electrode are treated to enhance the surface area. The treatment may be mechanical, chemical, or otherwise applied to enhance the surface area of the electrode. The repelling electrodes may also be made of a conductive polymer material, preferably a conductive synthetic polymer material. The advantage of having a unitary collecting electrode and a unitary repelling electrode both made of the same or similar material is that they may be recycled as a unit under recycling protocols requiring unitary materials and may be rigid enough to reduce the spacing that would have been required with foam based electrodes.

An electrostatic air precipitator electrode system where the particle collecting electrode or the particle collecting electrode and the repelling electrode are made of a unitary conductive polymer material, preferably a conductive synthetic polymer material. Parts of the conductive synthetic polymer collecting electrode are treated to enhance the surface area. The treatment may be mechanical, chemical, or otherwise applied to enhance the surface area of the electrode. The repelling electrodes may also be made of a conductive polymer material, preferably a conductive synthetic polymer material. The advantage of having a unitary collecting electrode and a unitary repelling electrode both made of the same or similar material is that they may be recycled as a unit under recycling protocols requiring unitary materials and may be rigid enough to reduce the spacing that would have been required with foam based electrodes.

A gas filter that includes a filter medium configured to filter a gas flow propagating from an upstream facing side through the filter medium to a downstream facing side. The filter medium includes a capacitor with a first electrode, a second electrode , and a dielectric medium. The gas filter also includes a first electrical contact and a second electrical contact such that if the first electrical contact is electrically connected via a first resistor to a branching point and the second electrical contact is electrically connected via a second resistor the same branching point. Further, the first electrode is preferably electrically connected to such branching point and the second electrode is preferably electrically connected to the second electrical contact.

A gas filter that includes a filter medium configured to filter a gas flow propagating from an upstream facing side through the filter medium to a downstream facing side. The filter medium includes a capacitor with a first electrode, a second electrode , and a dielectric medium. The gas filter also includes a first electrical contact and a second electrical contact such that if the first electrical contact is electrically connected via a first resistor to a branching point and the second electrical contact is electrically connected via a second resistor the same branching point. Further, the first electrode is preferably electrically connected to such branching point and the second electrode is preferably electrically connected to the second electrical contact.

An electrostatic precipitator is disclosed. The electrostatic precipitator includes an ionization unit configured to generate ions and a dust collection unit configured to electrically collect dust to which the ions are attached. The ionization unit is an ionizer that applies a predetermined voltage to an electrode needle to cause a corona discharge to generate the ions having the same polarity as a polarity of the applied voltage. The dust collection unit includes a high-voltage electrode disposed having a plurality of gaps for passing the dust to which the ions are attached, and a dust collection board disposed at a rear stage of the high-voltage electrode. A polarity of the voltage applied to the electrode needle of the ionization unit and the polarity of the voltage applied to the high-voltage electrode are set to the same polarity.

An electrostatic precipitator is disclosed. The electrostatic precipitator includes an ionization unit configured to generate ions and a dust collection unit configured to electrically collect dust to which the ions are attached. The ionization unit is an ionizer that applies a predetermined voltage to an electrode needle to cause a corona discharge to generate the ions having the same polarity as a polarity of the applied voltage. The dust collection unit includes a high-voltage electrode disposed having a plurality of gaps for passing the dust to which the ions are attached, and a dust collection board disposed at a rear stage of the high-voltage electrode. A polarity of the voltage applied to the electrode needle of the ionization unit and the polarity of the voltage applied to the high-voltage electrode are set to the same polarity.

Provided is an electric precipitator that collects dusty foreign matter by an electrostatic force, including: a laminated sheet at least including a dust collection layer that holds the dusty foreign matter in contact, a first electrode layer, a second electrode layer, and an insulation layer, the dust collection layer, the first electrode layer, the second electrode layer, and the insulation layer being laminated; and a power supply device that applies voltages across the first and second electrode layers. The insulation layer at least has a first insulation layer that insulates the dust collection layer and the first electrode layer, a second insulation layer that insulates the first electrode layer and the second electrode layer, and a third insulation layer that insulates the second electrode layer and a portion under the second electrode layer. Films having a surface resistivity of 10.sup.4 to 10.sup.8 are used for the first and second electrode layers.

Provided is an electric precipitator that collects dusty foreign matter by an electrostatic force, including: a laminated sheet at least including a dust collection layer that holds the dusty foreign matter in contact, a first electrode layer, a second electrode layer, and an insulation layer, the dust collection layer, the first electrode layer, the second electrode layer, and the insulation layer being laminated; and a power supply device that applies voltages across the first and second electrode layers. The insulation layer at least has a first insulation layer that insulates the dust collection layer and the first electrode layer, a second insulation layer that insulates the first electrode layer and the second electrode layer, and a third insulation layer that insulates the second electrode layer and a portion under the second electrode layer. Films having a surface resistivity of 10.sup.4 to 10.sup.8 are used for the first and second electrode layers.