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7. It is further contended that the District Environmental Engineer - Tamil Nadu Pollution Control Board, Ambattur by his letter dated 21.12.2016 submitted that during the inspection, it was revealed that the Public Works Department had blocked the said passage as ascertained and the directions of the Tribunal had been complied with. So, they prayed for accepting their contentions and passing appropriate orders.

8. The 10th Respondent filed counter contending thatAmbattur is an industrial town located at the north west of the Chennai city which falls under the administrative jurisdiction of Tiruvallur District of Tamil Nadu. Ambattur industrial estate is located in Corporation of Chennai, Zone - 7 (Ambattur). Ambattur Lake and Korattur Lake are the two major lakes located within the limit of Chennai Corporation, Zone - 7 (Ambattur). Ambattur Lake is located at south west corner of the Ambattur Corporation area and Korattur Lake is located on the northern side of Ambattur Corporation area. The surplus water discharged from the Ambattur Lake reaches Korattur Lake through the Ambattur lake surplus canal via the SIDCO Industrial Estate, Ambattur. The SIDCO Industrial Estate, Ambattur is spreading over an area of 1167 acres. On the Northern side, the industrial estate is bounded by the Chennai - Arakkonam railway line and the other three sides are surrounded by Corporation of Chennai, Zone-7 (Ambattur). Topographic studies show that the north phase of the estate is sloping towards the northeast (towards Korattur area), whereas the southern phase of the industrial estate is sloping towards the south. The industrial estate has 1,180 industrial sheds and 584 industrial plots. Most of the industries are small scale engineering units and they are carrying out fabrication/machining of auto & industrial equipments. The other typical of industries housed in the estate are Electroplating, Phosphating, powder coating, castings, heat treatment, foundries, forging, garments and electrical equipment etc. Light engineering industries do not involve any water consuming process and there is no generation of trade effluent from these industries. However, industries like electroplating, Phosphating, acid treatment and Garment washing units are trade effluent generating industries which are located both in North and South phase of the industrial estate. Under the Industrial Infrastructure Up - gradation Scheme (IIUS) announced by the Government of India, an industrial cluster comprising of Ambattur, Thirumudivakkam and Thirmazhisai of Thiruvallur District of Tamil Nadu has formed a company named as Chennai Auto Ancillary Industrial Infrastructure Upgradation Company (CAAIIUC). The upgradation and maintenance of the SIDCO Industrial Estate is being carried by M/s. Chennai Auto Ancillary Industrial Infrastructure Upgradation Company at present. It has established two common Sewage Treatment Plants, one with a capacity of 3 MLD for handling the sewage generated from the industrial units housed in the Ambattur Industrial estate (South phase) separately and other with a capacity of 2 MLD for handling the sewage generated from the industrial units housed in the Ambattur industrial estate (North Phase) separately. They had applied and obtained consent to operate separately for the said common STPs provided from the Board which is valid up to 31.05.2016. Sewage generated from the industrial units in the Ambattur industrial estate are connected to the said Common Sewage Treatment Plants for treatment. The effluent generating units have provided individual ETPs for the treatment of trade effluent. The Sewage generated from Thirumullaivoyal, Annanur and Ayyapakkam areas of Tiruvallur District are discharged through storm water drain and reaches nearby Ambattur Lake. Then it flows along with the sewage generated from the Ambattur corporation area such as MKB Nagar, Teachers colony, Dobhi colony, Ramapuram, Alagesan Nagar, Gnanamoorthy Nagar, Pattravakkam, Menambedu, Karukku, Mannurpet, Mangalapuram and then reaches Korattur Lake at downstream which traverse through Ambattur Industrial Estate (North Phase) and flows into the Korattur lake through two culverts one near DTP colony in the western end of the lake and another at Eastern end of the lake. The PWD had taken action for rehabilitation and restoration of Korattur Lake and plugged the said culverts on the Eastern and Western end of the Korattur Lake. So, the waste water from the above said areas find its way through an earthen channel which traverse through Korattur TNHB colony and reaches Otteri Nallah. Further, the Chennai Corporation has now plugged the said earthen channel near the western end of the north avenue road of Korattur south and carrying out the construction of storm water drain under ISWD which comprises of 8 feet width RCC channel i.e. converting the above said earthen drain into RCC channel. Due to the plugging of the above said earthen drain, water was stagnated in the Korattur Eri feeding channel area. As per order dated 01.12.2016, this Tribunal directed the officials respondents to file their status report. The inlet and outlet quality of the water from the STP managed by M/s. Chennai Auto Ancillary Industrial Infrastructure Upgradation Company Limited from March 2016 to October 2016 showed that the parameters analyzed generally satisfied the standards prescribed by the Board except TDS which is in the range of 2218 mg/l to 3066 mg/l as against 2100 mg/l and Chlorides in one occasions 1180 mg/l as against 1000 mg/l. As per the condition of the Consent, they have to reuse the entire quantity of sewage from the Common STP by its member units for greenbelt development on either side of the road and developing park / Avenue trees inside the SIDCO Industrial Estate, after satisfying the standards as prescribed by the Board. As the unit was discharging treated sewage outside the premises leading to Korattur Eri feeding earthen canal, a show cause notice was issued to the said common STP operator vide Proceedings dated 28.10.2016 for not reusing the treated sewage for greenbelt development and other purposes. They furnished a reply to the show cause notice issued. During inspection of the unit on 07.12.2016, it was noticed that all the treatment units of the Common STP were in operation and treated sewage is being discharged outside the premises and reaches Korattur Eri feeding channel area and got stagnated, as the Korattur Eri inlet channel and earthen drain leading to Otteri Nallah were plugged. Further action is being taken against the said unit for the said violation. As regards the 12th respondent - M/s. Tamil Nadu Cooperative Milk Producers Federation Ltd., Ambattur is concerned, it was located at Plot No.29830, Korattur village, Ambattur Taluk and Tiruvallur District and consent was issued to the unit to carryout standardized milk - 9000 T/Month vide Proceedings dated 06.11.1992 valid up to 31.03.1993 and the same was renewed up to 31.03.2017. The unit generates 4.5 KLD sewage and 325 KLD trade effluents. The unit has provided combined Effluent Treatment Plant for the treatment and disposal of sewage and trade effluent generated from the unit. The treated trade effluent is discharged on land for irrigation within the premises. They provided 4 T/hr Boiler - 2 Nos. attached to individual stack of height 30 M each and 275 KVA & 166 KVA DG Set with stack of height 5.2 M & 3.8 M respectively. The unit was inspected on 22.09.2016 and it was found that the unit was not operated properly and treated effluent was not properly disposed on land for gardening / greenbelt development / irrigation, further the unit had installed additional machineries for its expansion activity without obtaining consent from the Board. So, a show cause notice was issued to the unit under the provisions of Water (Prevention and Control of Pollution) Act, 1974 and Air (Prevention and Control of Pollution) Act, 1981 vide Proceedings dated 23.09.2016, for which, they sent a reply and applied for consent of the Board for expansion activity. The unit was again inspected on 07.12.2016 and it was noticed that the unit was in operation, but the ETP was not properly operated, trade effluents were not properly utilized for the purpose mentioned and it was simply stagnating in the premises. The unit was in the process of revamping the existing Effluent Treatment Plant to handle the sewage and trade effluent on account of expansion activity. Further action is being taken against the said unit for the said violations. As regards the 13threspondent - M/s. MBI Metal Alloys Private Limited is concerned, it is located at S.F. No.152, 153/1, 2, Plot No. 84/8, SIDCO industrial estate, Pattravakkam Village, Ambattur Taluk, Tiruvallur District and consent was issued to the unit for carrying out 1. Electroless nickel plating - 12 Lakh sq.Inch/Month, 2. Gold plating -6 Lakh sq. Inch / Month and 3. Electro lacquering - 6 Lakh sq. inch / Month vide Board Proceedings dated 01.10.2004 valid up to 31.03.2005 and same was renewed up to 30.09.2017. The unit generates 0.96 KLD of sewage and 1 KLD of trade effluent. The sewage is discharged into SIDCO underground sewer line for further treatment at the 11threspondent common sewage treatment plant (North Phase). The unit has provided Effluent treatment plant, RO system and elevated solar evaporation pan for the treatment and disposal of trade effluents generated from the unit. RO permeate is reused in the process and RO reject is discharged into Elevated solar evaporation pan to achieve the Zero liquid discharge system. The unit has provided wet scrubber attached to the plating section with stack of height 7.0 M, Polishing section with stack of height 7.0 M and 175 KVA DG set 2 Nos. with attached to stack of height 7.0 M each. During inspection on 05.12.2016 and 07.12.2016, it was found that the unit was in operation, ETP, RO and APC measures provided by the unit were in operation. RO permeate recycled in the process and RO reject disposed through elevated solar evaporate pan. As regards the 14th Respondent - M/s. Sunrise Electroplaters is concerned, it is located in Sy. No.150 Part, 122 Part, Shed No.246 of SIDCO Industrial Estate, Patravakkam Village, Ambattur Taluk, Tiruvallur District and Consent was issued to the unit to carryout

11. The 13th Respondent filed counter contending that they had obtained necessary Consent from the Pollution Control Board for their activities and also authorization under the Hazardous Waste (Management, Handling and Transboundary Movement) Rules, 2008 and they were adopting the pollution control mechanism to use their trade effluents and they are a Zero Liquid Discharge unit and the sewage generated was discharged into the SIDCO sewer line for further treatment in the Common Treatment Plant operated by the CAAIIUC. They denied the allegation that they were causing pollution to the Korattur Lake. So, they prayed for accepting their contentions and passing appropriate orders.

16. The 14th Respondent filed counter contending that they had obtained all necessary consent/permission/authorization as required under the environmental laws and they have provided all necessary treatment system and it is a Zero Liquid Discharge unit in respect of trade effluent and the sewage generated was being discharged into the SIDCO sewer line for further treatment in the Common Sewage Treatment Plant provided. They are not discharging any sewage outside their unit. They are strictly complying with the conditions imposed. So, they prayed for passing appropriate orders, accepting their contentions.

51. As regards the trade effluents are concerned, they adopt Zero Liquid Discharge (ZLD) system. As regards the sewage generated in that area is concerned, they are discharging into the Common sewer line provided by the SIDCO and it is being taken into the Common STP from where it is being treated.
52. It is also seen from the report submitted by the State Pollution Control Board that as per the directions of this Tribunal when inspections were conducted, they found some deficiencies in the Common STP operated by CAAIIUC and certain directions were issued and that is being followed by them. Further, it is seen from the report that certain units were operating without Consent and notices were issued and action was taken against those industries including closure direction were issued and subsequently, some of them had applied for Consent and the same had been granted.